| Name | CVE-2021-29155 |
| Description | An 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2690-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| linux (PTS) | bullseye | 5.10.223-1 | fixed |
| bullseye (security) | 5.10.226-1 | fixed |
| bookworm | 6.1.115-1 | fixed |
| bookworm (security) | 6.1.119-1 | fixed |
| trixie | 6.12.5-1 | fixed |
| sid | 6.12.6-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| linux | source | stretch | (not affected) | | | |
| linux | source | buster | 4.19.194-1 | | | |
| linux | source | (unstable) | 5.10.38-1 | | | |
| linux-4.19 | source | stretch | 4.19.194-1~deb9u1 | | DLA-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/