CVE-2021-29155

NameCVE-2021-29155
DescriptionAn issue was discovered in the Linux kernel through 5.11.x. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2690-1
NVD severitylow

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)stretch4.9.228-1fixed
stretch (security)4.9.272-2fixed
buster4.19.194-1fixed
buster (security)4.19.194-3fixed
bullseye, sid5.10.46-2fixed
linux-4.19 (PTS)stretch (security)4.19.194-3~deb9u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcestretch(not affected)
linuxsourcebuster4.19.194-1
linuxsource(unstable)5.10.38-1
linux-4.19sourcestretch4.19.194-1~deb9u1DLA-2690-1

Notes

[stretch] - linux <not-affected> (Vulnerability introduced later)
https://www.openwall.com/lists/oss-security/2021/04/18/4
Fixes need to be made complete for older series to not open CVE-2021-33200,
cf. https://lore.kernel.org/stable/215e98bf-21c7-0074-129d-49a51526418b@iogearbox.net/

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