CVE-2026-53352

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

signal: clear JOBCTL_PENDING_MASK for caller in zap_other_threads()

When a multi-threaded process receives a stop signal (e.g., SIGSTOP),

do_signal_stop() sets JOBCTL_STOP_PENDING and JOBCTL_STOP_CONSUME on all

threads and sets signal->group_stop_count to the number of threads. If

one of the threads concurrently calls execve(), de_thread() invokes

zap_other_threads() to kill all other threads. zap_other_threads()

aborts the pending group stop by resetting signal->group_stop_count to 0

and clears the JOBCTL_PENDING_MASK for all other threads. However, it

fails to clear the job control flags for the calling thread.

When execve() completes, the calling thread returns to user mode and

checks for pending signals. Seeing the stale JOBCTL_STOP_PENDING flag,

it calls do_signal_stop(), which invokes task_participate_group_stop().

Since JOBCTL_STOP_CONSUME is still set, it attempts to decrement the

already-zero signal->group_

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References