Bug 2507060 (CVE-2026-64370)

Summary: CVE-2026-64370 kernel: posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's posix-cpu-timers component. This vulnerability allows a local user to trigger a resource leak within the `do_cpu_nanosleep()` function. The issue occurs because a process identifier (PID) reference is not properly released if a timer creation operation fails. This unreleased resource can accumulate over time, potentially leading to a denial of service (DoS) due to system resource exhaustion.
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Description OSIDB Bzimport 2026-07-25 10:02:56 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-07-29 22:15:08 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072522-CVE-2026-64370-85cf@gregkh/T