CVE-2026-43272
Description
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix possible dereference of uninitialized pointer There is a pointer head_page in rb_meta_validate_events() which is not initialized at the beginning of a function. This pointer can be dereferenced if there is a failure during reader page validation. In this case the control is passed to "invalid" label where the pointer is dereferenced in a loop. To fix the issue initialize orig_head and head_page before calling rb_validate_buffer. Found by Linux Verification Center (linuxtesting.org) with SVACE.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Mitigation details
CVE-2026-43272 NameCVE-2026-43272 DescriptionIn the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix possible dereference of uninitialized pointer There is a pointer head_page in rb_meta_validate_events() which is not initialized at the beginning of a function. This pointer can be dereferenced if there is a failure during reader page validation. In this case the…
CVE-2026-43272
| Name | CVE-2026-43272 |
| Description | In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix possible dereference of uninitialized pointer There is a pointer head_page in rb_meta_validate_events() which is not initialized at the beginning of a function. This pointer can be dereferenced if there is a failure during reader page validation. In this case the control is passed to "invalid" label where the pointer is dereferenced in a loop. To fix the issue initialize orig_head and head_page before calling rb_validate_buffer. Found by Linux Verification Center (linuxtesting.org) with SVACE. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
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) | 5.10.257-1 | fixed | |
| bookworm | 6.1.170-3 | fixed | |
| bookworm (security) | 6.1.174-1 | fixed | |
| trixie | 6.12.86-1 | vulnerable | |
| trixie (security) | 6.12.90-2 | vulnerable | |
| forky | 7.0.9-1 | fixed | |
| sid | 7.0.10-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | bullseye | (not affected) | |||
| linux | source | bookworm | (not affected) | |||
| linux | source | (unstable) | 6.19.6-1 |
Notes
[bookworm] - linux <not-affected> (Vulnerable code not present)
[bullseye] - linux <not-affected> (Vulnerable code not present)
https://git.kernel.org/linus/f1547779402c4cd67755c33616b7203baa88420b (7.0-rc1)
Apply commands
[bookworm] - linux <not-affected> (Vulnerable code not present)[bullseye] - linux <not-affected> (Vulnerable code not present)https://git.kernel.org/linus/f1547779402c4cd67755c33616b7203baa88420b (7.0-rc1)OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 6.19.6-1 |
| debian | sid | fixed | 6.19.6-1 |
| debian | trixie | affected | |
| linux-kernel | affected | 6.18.16 |
References
- https://git.kernel.org/stable/c/bc77986f3cb7476637052edf2d87137fa39f153d
- https://git.kernel.org/stable/c/d9942396845fef2369478c157b26738fe07142f6
- https://git.kernel.org/stable/c/f1547779402c4cd67755c33616b7203baa88420b
- https://www.suse.com/security/cve/CVE-2026-43272.html
- https://security-tracker.debian.org/tracker/CVE-2026-43272
CWEs
CWE-476
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.