Public bug reported:
SRU Justification
Impact:
The upstream process for stable tree updates is quite similar
in scope to the Ubuntu SRU process, e.g., each patch has to
demonstrably fix a bug, and each patch is vetted by upstream
by originating either directly from a mainline/stable Linux tree or
a minimally backported form of that patch. The following upstream
stable patches should be included in the Ubuntu kernel:
upstream stable patchset 2026-09-02
Ported from the following upstream stable releases:
v6.6.144, v6.12.95
from git://git.kernel.org/
fuse: limit FUSE_NOTIFY_RETRIEVE to uptodate folios
ip6_vti: set netns_immutable on the fallback device.
debugobjects: Allow to refill the pool before SYSTEM_SCHEDULING
debugobjects: Use LD_WAIT_CONFIG instead of LD_WAIT_SLEEP
debugobjects: Do not fill_pool() if pi_blocked_on
debugobjects: Dont call fill_pool() in early boot hardirq context
ARM: group is_permission_fault() with is_translation_fault()
ARM: allow __do_kernel_fault() to report execution of memory faults
ARM: fix branch predictor hardening
RDMA/bnxt_re: zero shared page before exposing to userspace
i2c: stub: Reject I2C block transfers with invalid length
net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()
agp/amd64: Fix broken error propagation in agp_amd64_probe()
bpf: Reject sleepable kprobe_multi programs at attach time
selftests/bpf: Add test to ensure kprobe_multi is not sleepable
af_unix: Reject SIOCATMARK on non-stream sockets
bpf: Remove mark_precise_scalar_ids()
selftests/bpf: Tests for per-insn sync_linked_regs() precision tracking
selftests/bpf: Update comments find_equal_scalars->sync_linked_regs
regulator: core: fix locking in regulator_resolve_supply() error path
dlm: prevent NPD when writing a positive value to event_done
hv: utils: handle and propagate errors in kvp_register
Drivers: hv: vmbus: Improve the logic of reserving fb_mmio on Gen2 VMs
locking/rtmutex: Skip remove_waiter() when waiter is not enqueued
phonet: Pass ifindex to fill_addr().
phonet: Pass net and ifindex to phonet_address_notify().
net: phonet: free phonet_device after RCU grace period
fuse: re-lock request before replacing page cache folio
scripts/sorttable: Remove unused macro defines
scripts/sorttable: Remove unused write functions
scripts/sorttable: Remove unneeded Elf_Rel
scripts/sorttable: Have the ORC code use the _r() functions to read
scripts/sorttable: Make compare_extable() into two functions
scripts/sorttable: Convert Elf_Ehdr to union
scripts/sorttable: Replace Elf_Shdr Macro with a union
scripts/sorttable: Convert Elf_Sym MACRO over to a union
scripts/sorttable: Add helper functions for Elf_Ehdr
scripts/sorttable: Add helper functions for Elf_Shdr
scripts/sorttable: Add helper functions for Elf_Sym
scripts/sorttable: Use uint64_t for mcount sorting
scripts/sorttable: Move code from sorttable.h into sorttable.c
scripts/sorttable: Get start/stop_mcount_loc from ELF file directly
scripts/sorttable: Use a structure of function pointers for elf helpers
arm64: scripts/sorttable: Implement sorting mcount_loc at boot for arm64
UBUNTU: [Config] Set configs to sort mcount_loc at boot for arm64
scripts/sorttable: Have mcount rela sort use direct values
scripts/sorttable: Always use an array for the mcount_loc sorting
scripts/sorttable: Zero out weak functions in mcount_loc table
ftrace: Update the mcount_loc check of skipped entries
ftrace: Have ftrace pages output reflect freed pages
ftrace: Do not over-allocate ftrace memory
ftrace: Test mcount_loc addr before calling ftrace_call_addr()
ftrace: Check against is_kernel_text() instead of kaslr_offset()
scripts/sorttable: Use normal sort if theres no relocs in the mcount section
scripts/sorttable: Allow matches to functions before function entry
scripts/sorttable: Fix endianness handling in build-time mcount sort
vc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write
ksmbd: reject non-VALID session in compound request branch
media: vidtv: fix NULL pointer dereference in vidtv_mux_push_si
virtiofs: fix UAF on submount umount
file: add fput() cleanup helper
eventpoll: use hlist_is_singular_node() in __ep_remove()
KVM: x86/mmu: Ensure hugepage is in by slot before checking max mapping level
Revert "ptp: add testptp mask test"
Bluetooth: btmtk: validate WMT event SKB length before struct access
Bluetooth: btmtk: accept too short WMT FUNC_CTRL events
batman-adv: tp_meter: keep unacked list in ascending ordered
batman-adv: tp_meter: initialize dup_acks explicitly
batman-adv: tp_meter: initialize dec_cwnd explicitly
batman-adv: tp_meter: avoid window underflow
batman-adv: tp_meter: avoid divide-by-zero for dec_cwnd
batman-adv: tp_meter: fix fast recovery precondition
batman-adv: tp_meter: handle seqno wrap-around for fast recovery detection
batman-adv: tp_meter: add only finished tp_vars to lists
batman-adv: bla: annotate lasttime access with READ/WRITE_ONCE
batman-adv: prevent ELP transmission interval underflow
batman-adv: tp_meter: initialize last_recv_time during init
batman-adv: ensure bcast is writable before modifying TTL
batman-adv: fix (m|b)cast csum after decrementing TTL
batman-adv: frag: ensure fragment is writable before modifying TTL
batman-adv: frag: avoid underflow of TTL
batman-adv: v: prevent OGM aggregation on disabled hardif
batman-adv: tp_meter: restrict number of unacked list entries
batman-adv: tp_meter: annotate last_recv_time access with READ/WRITE_ONCE
batman-adv: tp_meter: prevent parallel modifications of last_recv
batman-adv: tp_meter: handle overlapping packets
batman-adv: tt: don't merge change entries with different VIDs
batman-adv: tt: track roam count per VID
batman-adv: dat: prevent false sharing between VLANs
batman-adv: tvlv: enforce 2-byte alignment
batman-adv: tvlv: avoid race of cifsnotfound handler state
ipv6: account for fraggap on the paged allocation path
inet: add indirect call wrapper for getfrag() calls
ipv4: account for fraggap on the paged allocation path
ntfs3: reject direct userspace writes to reserved $LX* xattrs
af_unix: Set gc_in_progress to true in unix_gc().
mac802154: llsec: add skb_cow_data() before in-place crypto
net: skmsg: preserve sg.copy across SG transforms
apparmor: mediate the implicit connect of TCP fast open sendmsg
apparmor: fix use-after-free in rawdata dedup loop
NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR
fbdev: fix use-after-free in store_modes()
err.h: use __always_inline on all error pointer helpers
KEYS: fix overflow in keyctl_pkey_params_get_2()
keys: Pin request_key_auth payload in instantiate paths
wifi: mt76: mt76x2u: Add support for ELECOM WDC-867SU3S
wifi: ath11k: fix warning when unbinding
wifi: rtlwifi: rtl8821ae: Fix C2H bit location in RX descriptor
wifi: rtw88: increase TX report timeout to fix race condition
wifi: rtw88: usb: fix memory leaks on USB write failures
wifi: iwlwifi: mvm: fix race condition in PTP removal
f2fs: validate compress cache inode only when enabled
f2fs: fix to round down start offset of fallocate for pin file
f2fs: validate ACL entry sizes in f2fs_acl_from_disk()
f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node()
f2fs: keep atomic write retry from zeroing original data
bpf: use kvfree() for replaced sysctl write buffer
MIPS: DEC: Prevent initial console buffer from landing in XKPHYS
exfat: fix potential use-after-free in exfat_find_dir_entry()
gfs2: fix use-after-free in gfs2_qd_dealloc
hdlc_ppp: sync per-proto timers before freeing hdlc state
blk-cgroup: fix UAF in __blkcg_rstat_flush()
tipc: fix slab-use-after-free Read in tipc_aead_decrypt_done
pNFS: Fix use-after-free in pnfs_update_layout()
irqchip/imgpdc: Fix resource leak, add missing chained handler cleanup on remove
fpga: region: fix use-after-free in child_regions_with_firmware()
rpmsg: char: Fix use-after-free on probe error path
ocfs2: reject oversized group bitmap descriptors
9p: avoid putting oldfid in p9_client_walk() error path
KVM: x86: hyper-v: Bound the bank index when querying sparse banks
KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path
power: reset: linkstation-poweroff: fix use-after-free in the
linkstation_poweroff_init()
fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var
fbdev: modedb: fix a possible UAF in fb_find_mode()
fbdev: modedb: Fix misaligned fields in the 1920x1080-60 mode
NFSD: Fix SECINFO_NO_NAME decode error cleanup
nfsd: fix posix_acl leak on SETACL decode failure
nfsd: check get_user() return when reading princhashlen
NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr
NFS: Prevent resource leak in nfs_alloc_server()
ksmbd: fix out-of-bounds read in smb_check_perm_dacl()
serial: qcom_geni: Fix RX DMA stall when SE_DMA_RX_LEN_IN is zero
serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails
drivers/base/memory: set mem->altmap after successful device registration
wifi: mt76: mt7921: avoid undesired changes of the preset regulatory domain
net: Drop the lock in skb_may_tx_timestamp()
ACPI: scan: Use async schedule function in acpi_scan_clear_dep_fn()
xfs: fix error returns in CoW fork repair
locking/mutex: Remove wakeups from under mutex::wait_lock
net: ipv6: Make udp_tunnel6_xmit_skb() void
sctp: disable BH before calling udp_tunnel_xmit_skb()
iio: light: veml6075: add bounds check to veml6075_it_ms index
Revert "PCI: qcom: Advertise Hotplug Slot Capability with no Command Completion
support"
KVM: SEV: Ignore MMIO requests of length '0'
KVM: SEV: Ignore Port I/O requests of length '0'
mtd: spi-nor: macronix: Add post_sfdp fixups for Quad Input Page Program
mtd: spi-nor: macronix: add support for mx66{l2, u1}g45g
KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with
get_unaligned()
LoongArch: Report dying CPU to RCU in stop_this_cpu()
MIPS: smp: report dying CPU to RCU in stop_this_cpu()
i2c: core: fix adapter registration race
nfsd: reset write verifier on deferred writeback errors
net/tcp-ao: fix use-after-free of key in del_async path
locking: rtmutex: Fix wake_q logic in task_blocks_on_rt_mutex
bonding: annotate data-races arcound churn variables
UBUNTU: Upstream stable to v6.6.144, v6.12.95
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Noble)
Importance: Medium
Assignee: Bethany Jamison (bjamison)
Status: In Progress
** Tags: kernel-stable-tracking-bug
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
** Changed in: linux (Ubuntu Noble)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Noble)
Status: New => In Progress
** Changed in: linux (Ubuntu Noble)
Assignee: (unassigned) => Bethany Jamison (bjamison)
** Description changed:
SRU Justification
Impact:
The upstream process for stable tree updates is quite similar
in scope to the Ubuntu SRU process, e.g., each patch has to
demonstrably fix a bug, and each patch is vetted by upstream
by originating either directly from a mainline/stable Linux tree or
a minimally backported form of that patch. The following upstream
stable patches should be included in the Ubuntu kernel:
upstream stable patchset 2026-09-02
+
+ Ported from the following upstream stable releases:
+ v6.6.144, v6.12.95
+
from git://git.kernel.org/
+
+ fuse: limit FUSE_NOTIFY_RETRIEVE to uptodate folios
+ ip6_vti: set netns_immutable on the fallback device.
+ debugobjects: Allow to refill the pool before SYSTEM_SCHEDULING
+ debugobjects: Use LD_WAIT_CONFIG instead of LD_WAIT_SLEEP
+ debugobjects: Do not fill_pool() if pi_blocked_on
+ debugobjects: Dont call fill_pool() in early boot hardirq context
+ ARM: group is_permission_fault() with is_translation_fault()
+ ARM: allow __do_kernel_fault() to report execution of memory faults
+ ARM: fix branch predictor hardening
+ RDMA/bnxt_re: zero shared page before exposing to userspace
+ i2c: stub: Reject I2C block transfers with invalid length
+ net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()
+ agp/amd64: Fix broken error propagation in agp_amd64_probe()
+ bpf: Reject sleepable kprobe_multi programs at attach time
+ selftests/bpf: Add test to ensure kprobe_multi is not sleepable
+ af_unix: Reject SIOCATMARK on non-stream sockets
+ bpf: Remove mark_precise_scalar_ids()
+ selftests/bpf: Tests for per-insn sync_linked_regs() precision tracking
+ selftests/bpf: Update comments find_equal_scalars->sync_linked_regs
+ regulator: core: fix locking in regulator_resolve_supply() error path
+ dlm: prevent NPD when writing a positive value to event_done
+ hv: utils: handle and propagate errors in kvp_register
+ Drivers: hv: vmbus: Improve the logic of reserving fb_mmio on Gen2 VMs
+ locking/rtmutex: Skip remove_waiter() when waiter is not enqueued
+ phonet: Pass ifindex to fill_addr().
+ phonet: Pass net and ifindex to phonet_address_notify().
+ net: phonet: free phonet_device after RCU grace period
+ fuse: re-lock request before replacing page cache folio
+ scripts/sorttable: Remove unused macro defines
+ scripts/sorttable: Remove unused write functions
+ scripts/sorttable: Remove unneeded Elf_Rel
+ scripts/sorttable: Have the ORC code use the _r() functions to read
+ scripts/sorttable: Make compare_extable() into two functions
+ scripts/sorttable: Convert Elf_Ehdr to union
+ scripts/sorttable: Replace Elf_Shdr Macro with a union
+ scripts/sorttable: Convert Elf_Sym MACRO over to a union
+ scripts/sorttable: Add helper functions for Elf_Ehdr
+ scripts/sorttable: Add helper functions for Elf_Shdr
+ scripts/sorttable: Add helper functions for Elf_Sym
+ scripts/sorttable: Use uint64_t for mcount sorting
+ scripts/sorttable: Move code from sorttable.h into sorttable.c
+ scripts/sorttable: Get start/stop_mcount_loc from ELF file directly
+ scripts/sorttable: Use a structure of function pointers for elf helpers
+ arm64: scripts/sorttable: Implement sorting mcount_loc at boot for arm64
+ UBUNTU: [Config] Set configs to sort mcount_loc at boot for arm64
+ scripts/sorttable: Have mcount rela sort use direct values
+ scripts/sorttable: Always use an array for the mcount_loc sorting
+ scripts/sorttable: Zero out weak functions in mcount_loc table
+ ftrace: Update the mcount_loc check of skipped entries
+ ftrace: Have ftrace pages output reflect freed pages
+ ftrace: Do not over-allocate ftrace memory
+ ftrace: Test mcount_loc addr before calling ftrace_call_addr()
+ ftrace: Check against is_kernel_text() instead of kaslr_offset()
+ scripts/sorttable: Use normal sort if theres no relocs in the mcount section
+ scripts/sorttable: Allow matches to functions before function entry
+ scripts/sorttable: Fix endianness handling in build-time mcount sort
+ vc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write
+ ksmbd: reject non-VALID session in compound request branch
+ media: vidtv: fix NULL pointer dereference in vidtv_mux_push_si
+ virtiofs: fix UAF on submount umount
+ file: add fput() cleanup helper
+ eventpoll: use hlist_is_singular_node() in __ep_remove()
+ KVM: x86/mmu: Ensure hugepage is in by slot before checking max mapping level
+ Revert "ptp: add testptp mask test"
+ Bluetooth: btmtk: validate WMT event SKB length before struct access
+ Bluetooth: btmtk: accept too short WMT FUNC_CTRL events
+ batman-adv: tp_meter: keep unacked list in ascending ordered
+ batman-adv: tp_meter: initialize dup_acks explicitly
+ batman-adv: tp_meter: initialize dec_cwnd explicitly
+ batman-adv: tp_meter: avoid window underflow
+ batman-adv: tp_meter: avoid divide-by-zero for dec_cwnd
+ batman-adv: tp_meter: fix fast recovery precondition
+ batman-adv: tp_meter: handle seqno wrap-around for fast recovery detection
+ batman-adv: tp_meter: add only finished tp_vars to lists
+ batman-adv: bla: annotate lasttime access with READ/WRITE_ONCE
+ batman-adv: prevent ELP transmission interval underflow
+ batman-adv: tp_meter: initialize last_recv_time during init
+ batman-adv: ensure bcast is writable before modifying TTL
+ batman-adv: fix (m|b)cast csum after decrementing TTL
+ batman-adv: frag: ensure fragment is writable before modifying TTL
+ batman-adv: frag: avoid underflow of TTL
+ batman-adv: v: prevent OGM aggregation on disabled hardif
+ batman-adv: tp_meter: restrict number of unacked list entries
+ batman-adv: tp_meter: annotate last_recv_time access with READ/WRITE_ONCE
+ batman-adv: tp_meter: prevent parallel modifications of last_recv
+ batman-adv: tp_meter: handle overlapping packets
+ batman-adv: tt: don't merge change entries with different VIDs
+ batman-adv: tt: track roam count per VID
+ batman-adv: dat: prevent false sharing between VLANs
+ batman-adv: tvlv: enforce 2-byte alignment
+ batman-adv: tvlv: avoid race of cifsnotfound handler state
+ ipv6: account for fraggap on the paged allocation path
+ inet: add indirect call wrapper for getfrag() calls
+ ipv4: account for fraggap on the paged allocation path
+ ntfs3: reject direct userspace writes to reserved $LX* xattrs
+ af_unix: Set gc_in_progress to true in unix_gc().
+ mac802154: llsec: add skb_cow_data() before in-place crypto
+ net: skmsg: preserve sg.copy across SG transforms
+ apparmor: mediate the implicit connect of TCP fast open sendmsg
+ apparmor: fix use-after-free in rawdata dedup loop
+ NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR
+ fbdev: fix use-after-free in store_modes()
+ err.h: use __always_inline on all error pointer helpers
+ KEYS: fix overflow in keyctl_pkey_params_get_2()
+ keys: Pin request_key_auth payload in instantiate paths
+ wifi: mt76: mt76x2u: Add support for ELECOM WDC-867SU3S
+ wifi: ath11k: fix warning when unbinding
+ wifi: rtlwifi: rtl8821ae: Fix C2H bit location in RX descriptor
+ wifi: rtw88: increase TX report timeout to fix race condition
+ wifi: rtw88: usb: fix memory leaks on USB write failures
+ wifi: iwlwifi: mvm: fix race condition in PTP removal
+ f2fs: validate compress cache inode only when enabled
+ f2fs: fix to round down start offset of fallocate for pin file
+ f2fs: validate ACL entry sizes in f2fs_acl_from_disk()
+ f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node()
+ f2fs: keep atomic write retry from zeroing original data
+ bpf: use kvfree() for replaced sysctl write buffer
+ MIPS: DEC: Prevent initial console buffer from landing in XKPHYS
+ exfat: fix potential use-after-free in exfat_find_dir_entry()
+ gfs2: fix use-after-free in gfs2_qd_dealloc
+ hdlc_ppp: sync per-proto timers before freeing hdlc state
+ blk-cgroup: fix UAF in __blkcg_rstat_flush()
+ tipc: fix slab-use-after-free Read in tipc_aead_decrypt_done
+ pNFS: Fix use-after-free in pnfs_update_layout()
+ irqchip/imgpdc: Fix resource leak, add missing chained handler cleanup on
remove
+ fpga: region: fix use-after-free in child_regions_with_firmware()
+ rpmsg: char: Fix use-after-free on probe error path
+ ocfs2: reject oversized group bitmap descriptors
+ 9p: avoid putting oldfid in p9_client_walk() error path
+ KVM: x86: hyper-v: Bound the bank index when querying sparse banks
+ KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path
+ power: reset: linkstation-poweroff: fix use-after-free in the
linkstation_poweroff_init()
+ fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var
+ fbdev: modedb: fix a possible UAF in fb_find_mode()
+ fbdev: modedb: Fix misaligned fields in the 1920x1080-60 mode
+ NFSD: Fix SECINFO_NO_NAME decode error cleanup
+ nfsd: fix posix_acl leak on SETACL decode failure
+ nfsd: check get_user() return when reading princhashlen
+ NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr
+ NFS: Prevent resource leak in nfs_alloc_server()
+ ksmbd: fix out-of-bounds read in smb_check_perm_dacl()
+ serial: qcom_geni: Fix RX DMA stall when SE_DMA_RX_LEN_IN is zero
+ serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails
+ drivers/base/memory: set mem->altmap after successful device registration
+ wifi: mt76: mt7921: avoid undesired changes of the preset regulatory domain
+ net: Drop the lock in skb_may_tx_timestamp()
+ ACPI: scan: Use async schedule function in acpi_scan_clear_dep_fn()
+ xfs: fix error returns in CoW fork repair
+ locking/mutex: Remove wakeups from under mutex::wait_lock
+ net: ipv6: Make udp_tunnel6_xmit_skb() void
+ sctp: disable BH before calling udp_tunnel_xmit_skb()
+ iio: light: veml6075: add bounds check to veml6075_it_ms index
+ Revert "PCI: qcom: Advertise Hotplug Slot Capability with no Command
Completion support"
+ KVM: SEV: Ignore MMIO requests of length '0'
+ KVM: SEV: Ignore Port I/O requests of length '0'
+ mtd: spi-nor: macronix: Add post_sfdp fixups for Quad Input Page Program
+ mtd: spi-nor: macronix: add support for mx66{l2, u1}g45g
+ KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with
get_unaligned()
+ LoongArch: Report dying CPU to RCU in stop_this_cpu()
+ MIPS: smp: report dying CPU to RCU in stop_this_cpu()
+ i2c: core: fix adapter registration race
+ nfsd: reset write verifier on deferred writeback errors
+ net/tcp-ao: fix use-after-free of key in del_async path
+ locking: rtmutex: Fix wake_q logic in task_blocks_on_rt_mutex
+ bonding: annotate data-races arcound churn variables
+ UBUNTU: Upstream stable to v6.6.144, v6.12.95
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https://bugs.launchpad.net/bugs/2166192
Title:
Noble update: upstream stable patchset 2026-09-02
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