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.

https://git.kernel.org/stable/c/7776f9226e99eb49d97492b0b445027cfcb189da

https://git.kernel.org/stable/c/87bd2ad568e15b90d5f7d4bcd70342d05dad649c

https://git.kernel.org/stable/c/8a270b1258797f61b61da44f8bfd41a581b5c85b

https://git.kernel.org/stable/c/8f06363446c5d043c9a7c008b250040e9de98cf9

https://git.kernel.org/stable/c/afed3cdc1cca133f804fcf57ff228974f424b23a

https://git.kernel.org/stable/c/d605d00085adc3fddf67de01dc2a44aebf1a3fb5

https://git.kernel.org/stable/c/e5ffc638faf5dc7d9dc85c9a95e10bf97442e0c0

https://git.kernel.org/stable/c/eb4cec29a78334d09bcfb41c0660cdd62ba05843

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