This bug was fixed in the package linux - 4.15.0-70.79
---------------
linux (4.15.0-70.79) bionic; urgency=medium
* Ubuntu-5.0.0-33.35 introduces KVM regression with old Intel CPUs and Linux
guests (LP: #1851709)
- Revert "KVM: x86: Manually calculate reserved bits when loading PDPTRS"
* Incomplete i915 fix for 64-bit x86 kernels (LP: #1852141) // CVE-2019-0155
- SAUCE: drm/i915/cmdparser: Fix jump whitelist clearing
-- Stefan Bader <stefan.ba...@canonical.com> Tue, 12 Nov 2019 10:54:50
+0100
** Changed in: linux (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1852141
Title:
CVE-2019-0155: incomplete fix for 64-bit x86 kernels
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Xenial:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Disco:
Fix Released
Status in linux source package in Eoan:
Fix Released
Bug description:
[Impact]
The initial set of Ubuntu kernel updates to address CVE-2019-0155 are
not complete for 64-bit x86 kernels (amd64). The 32-bit x86 kernel
(i386) updates are complete. It may be possible for an attacker to
bypass the mitigations on 64-bit systems.
The following upstream patch is needed:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ea0b163b13ffc52818c079adb00d55e227a6da6f
[Test Case]
Upstream has ran the proposed fix through their regression test suite.
We don't have a reproducer for CVE-2019-0155 so the test case is
simply to ensure that desktop graphics continue to work.
[Regression Potential]
Low, the fix is simple, tested, and, AAUI, the affected code path
should only be legitimately used by the test suite.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1852141/+subscriptions
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