CVE-2023-0045

NameCVE-2023-0045
DescriptionThe current implementation of the prctl syscall does not issue an IBPB immediately during the syscall. The ib_prctl_set  function updates the Thread Information Flags (TIFs) for the task and updates the SPEC_CTRL MSR on the function __speculation_ctrl_update, but the IBPB is only issued on the next schedule, when the TIF bits are checked. This leaves the victim vulnerable to values already injected on the BTB, prior to the prctl syscall.  The patch that added the support for the conditional mitigation via prctl (ib_prctl_set) dates back to the kernel 4.9.176. We recommend upgrading past commit a664ec9158eeddd75121d39c9a0758016097fa96
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3403-1, DLA-3404-1, ELA-845-1, ELA-847-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie, jessie (lts)3.16.84-1vulnerable
stretch (security)4.9.320-2vulnerable
stretch (lts), stretch4.9.320-3vulnerable
buster4.19.249-2vulnerable
buster (security)4.19.289-2fixed
bullseye5.10.178-3fixed
bullseye (security)5.10.191-1fixed
bookworm6.1.38-1fixed
bookworm (security)6.1.52-1fixed
sid, trixie6.5.3-1fixed
linux-4.19 (PTS)jessie, jessie (lts)4.19.289-2~deb8u1fixed
stretch (security)4.19.232-1~deb9u1vulnerable
stretch (lts), stretch4.19.289-2~deb9u1fixed
linux-5.10 (PTS)stretch (lts), stretch5.10.179-5~deb9u1fixed
buster (security)5.10.179-5~deb10u1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcejessie(unfixed)end-of-life
linuxsourcestretch(unfixed)end-of-life
linuxsourcebuster4.19.282-1DLA-3403-1
linuxsourcebullseye5.10.178-1
linuxsource(unstable)6.1.7-1
linux-4.19sourcejessie4.19.282-1~deb8u1ELA-847-1
linux-4.19sourcestretch4.19.282-1~deb9u1ELA-847-1
linux-5.10sourcestretch5.10.178-3~deb9u1ELA-845-1
linux-5.10sourcebuster5.10.178-3~deb10u1DLA-3404-1

Notes

https://www.openwall.com/lists/oss-security/2023/02/03/1
https://github.com/google/security-research/security/advisories/GHSA-9x5g-vmxf-4qj8#event-88245
https://git.kernel.org/linus/a664ec9158eeddd75121d39c9a0758016097fa96 (6.2-rc3)
https://github.com/es0j/CVE-2023-0045

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