tools/power/x86/intel-speed-select: Harden daemon pidfile open

Summary

In the Linux kernel, the following vulnerability has been resolved: tools/power/x86/intel-speed-select: Harden daemon pidfile open Avoid symlink-based pidfile clobbering by opening the pidfile with O_NOFOLLOW and validating it with fstat() before locking/writing. The daemon currently uses a fixed pidfile path under /tmp. A local unprivileged user can pre-create a symlink at that path and cause a root-run daemon instance to write into an attacker-chosen file.

Timeline

1. Aug 28, 2026, 6:49 AM UTCCVE published
2. Oct 16, 2026, 7:19 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 16, 2026, 7:26 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 · fixed in 905493a6338c82a70da16f86e0a6215db5a3d73d; From 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 · fixed in db938eb9a3c1317596c28e94413b33426508d51b; From 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 · fixed in 72a07abc6b9046f07a08bba353cad7667bcc9dce; From 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 · fixed in 19ffeb30fdfce63f8d6aca71bcdddb3f69d46278; From 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 · fixed in e8adac69d1bdf035ef97cc914e845acd4ef08e28; From 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6 · fixed in 607af438e6430893a822964c841a1994b33acccc

• Linux Linux

  5.18

• KernelLinux

  From 5.18.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 6