Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-90339

Vulnerability details

The vulnerability allows a local user to cause incorrect syscall return values.

The vulnerability exists due to improper handling of an intercepted syscall return-value sentinel in the PowerPC system_call_exception() syscall handler when seccomp or ptrace intercepts a syscall and explicitly sets its return value. A local user can trigger a syscall subject to seccomp or ptrace interception to cause incorrect syscall return values.

The issue occurs on PowerPC systems with GENERIC_ENTRY enabled and applies to both ppc32 and ppc64.

Affected software

How to mitigate CVE-2026-90339

External References

• https://git.kernel.org/stable/c/19b54740e2e1102c7d48553d9e0347c1f6af22b0
• https://git.kernel.org/stable/c/69cb2be898be6d5826cacd1a628f6945a24480b6

Related Security Bulletins

• Improper Check or Handling of Exceptional Conditions in Linux kernel powerpc kernel