CVE-2026-43272

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/bc77986f3cb7476637052edf2d87137fa39f153d ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/bc77986f3cb7476637052edf2d87137fa39f153dPatch
• https://git.kernel.org/stable/c/d9942396845fef2369478c157b26738fe07142f6Patch
• https://git.kernel.org/stable/c/f1547779402c4cd67755c33616b7203baa88420bPatch
• https://git.kernel.org/stable/c/a4afdff9c715af50cf6c3f2dc601932c2cea17a2