Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: tracing: Hold trace_types_lock when resetting last boot data from readers update_last_data_if_empty() is called from tracing_open() with O_TRUNC, tracing_read_pipe() and tracing_buffers_read() without trace_types_lock. Two readers can both pass the LAST_BOOT test and free module_delta twice, and a module notifier can update module_delta while it is being freed. Take trace_types_lock in those paths and keep the callers that already hold it on an unlocked variant.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund2 Nov 2026WID-SEC-2026-4302

  Linux Kernel: Multiple vulnerabilities allow an unspecified attack Translated from German

  Risk mediumCVE-2026-99237CVE-2026-99264CVE-2026-99220+50 more CVEs

[ References ]References

• git.kernel.org/stable/c/1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa
• git.kernel.org/stable/c/5a6bd62f09147b49b31fd19d4eba122cb5f941a1
• git.kernel.org/stable/c/92b69f6db640dadc0851762ee2e12db99f083cad
• git.kernel.org/stable/c/d6d991afe775ab7fcf89523a2502b7ca3be56ffd