posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path

Summary

In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path In do_cpu_nanosleep(), posix_cpu_timer_create() takes a pid reference via get_pid() and stores it in timer.it.cpu.pid. If the subsequent posix_cpu_timer_set() call fails, the function returns immediately without calling posix_cpu_timer_del() to release the pid reference, causing a leak. Fix it by calling posix_cpu_timer_del() before the unlock-and-return on the error path, consistent with the other exit paths in the same function.

Timeline

1. Jul 25, 2026, 8:50 AM UTCCVE published
2. Oct 15, 2026, 1:23 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in afed3cdc1cca133f804fcf57ff228974f424b23a; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 8a270b1258797f61b61da44f8bfd41a581b5c85b; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in d605d00085adc3fddf67de01dc2a44aebf1a3fb5; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in e5ffc638faf5dc7d9dc85c9a95e10bf97442e0c0; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in eb4cec29a78334d09bcfb41c0660cdd62ba05843; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 7776f9226e99eb49d97492b0b445027cfcb189da; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 8f06363446c5d043c9a7c008b250040e9de98cf9; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 87bd2ad568e15b90d5f7d4bcd70342d05dad649c

• Linux Linux

  2.6.12

• KernelLinux

  From 2.6.12 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.96; From 6.13.0 · fixed in 6.18.39; From 6.19.0 · fixed in 7.1.4

References 8