Linux Kernel ring buffer uninitialized pointer deref CVE-2026-43272
CVE-2026-43272 Published on May 6, 2026
ring-buffer: Fix possible dereference of uninitialized pointer
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.
Products Associated with CVE-2026-43272
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Affected Versions
Linux:- Version 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 and below bc77986f3cb7476637052edf2d87137fa39f153d is affected.
- Version 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 and below d9942396845fef2369478c157b26738fe07142f6 is affected.
- Version 5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55 and below f1547779402c4cd67755c33616b7203baa88420b is affected.
- Version 6.12 is affected.
- Before 6.12 is unaffected.
- Version 6.18.16, <= 6.18.* is unaffected.
- Version 6.19.6, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.