Race condition in Linux kernel - CVE-2026-89771

Vulnerability details

The vulnerability allows a local user to trigger a race condition during ring buffer reads.

The vulnerability exists due to a race condition in Linux kernel ring buffer reader operations when concurrently resizing ring buffer subbuffers and reading ring buffer pages. A local user can invoke concurrent subbuffer resizing and ring buffer read operations to trigger a race condition during ring buffer reads.

Affected software

How to mitigate CVE-2026-89771

External References

• https://git.kernel.org/stable/c/0c7c517827a453128a8f58bfd849546a29813b27
• https://git.kernel.org/stable/c/50f4a793c4ff24826efb0ac700989a5063cc53df
• https://git.kernel.org/stable/c/6d666f0b8b36c0765cf19fbe6de5a7ba5a73aad9
• https://git.kernel.org/stable/c/8a5f63637890f03177146efddaba5ec7a1b4d61f

Related Security Bulletins

• Race condition in Linux kernel trace