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CVE-2026-53352 Linux CVE debrief

A race condition vulnerability was found in the Linux kernel's signal handling mechanism. When a multi-threaded process receives a stop signal, the JOBCTL_PENDING_MASK is not properly cleared for the calling thread, leading to a warning and potential system instability. This issue arises from the zap_other_threads function failing to clear the JOBCTL_PENDING_MASK for the calling thread when aborting a pending group stop. As a result, when the thread returns to user mode and checks for pending signals, it may trigger a warning and potentially cause system instability. The vulnerability has been resolved by clearing the JOBCTL_PENDING_MASK for the calling thread in zap_other_threads(), aligning with other functions that tear down a thread group and abort group stops.

Vendor
Linux
Product
Unknown
CVSS
MEDIUM 4.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-01
Original CVE updated
2026-07-22
Advisory published
2026-07-01
Advisory updated
2026-07-22

Who should care

Linux kernel developers, administrators, and users who rely on Linux-based systems should be aware of this vulnerability and take steps to mitigate it. They should review the official patches provided by the Linux kernel maintainers and ensure that the Linux kernel is updated to a version that includes the fix. Additionally, they should monitor system logs for potential issues related to this vulnerability and review compensating controls for exposed systems while remediation is scheduled and verified.

Technical summary

The vulnerability occurs in the zap_other_threads function, which fails to clear the JOBCTL_PENDING_MASK for the calling thread when aborting a pending group stop. This can cause a warning and system instability when the thread returns to user mode and checks for pending signals. The fix involves clearing the JOBCTL_PENDING_MASK for the calling thread, ensuring that it does not retain any stale job control state after the thread group is destroyed. This change aligns with other functions that tear down a thread group and abort group stops, such as zap_process() and complete_signal().

Defensive priority

Medium

Recommended defensive actions

  • Apply the official patches provided by the Linux kernel maintainers.
  • Ensure that the Linux kernel is updated to a version that includes the fix.
  • Monitor system logs for potential issues related to this vulnerability.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The vulnerability was resolved by clearing the JOBCTL_PENDING_MASK for the calling thread in zap_other_threads(). The fix aligns with other functions that tear down a thread group and abort group stops, such as zap_process() and complete_signal(). The CVE record was published on 2026-07-01T14:16:43.347Z and has not been modified since then. The official patches provided by the Linux kernel maintainers should be applied to mitigate this vulnerability.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-01T14:16:43.347Z and has not been modified since then.