signal: clear JOBCTL_PENDING_MASK for caller in zap_other_threads()

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Summary

CVECVE-2026-53352
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-01 14:16:43 UTC
Updated2026-07-01 14:16:43 UTC
DescriptionIn 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_stop_count, triggering a warning: sig->group_stop_count == 0 WARNING: CPU: 1 PID: 6475 at kernel/signal.c:373 task_participate_group_stop+0x215/0x2d0 Call Trace: <TASK> do_signal_stop+0x3be/0x5c0 kernel/signal.c:2619 get_signal+0xa8c/0x1330 kernel/signal.c:2884 arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x8c/0x4d0 kernel/entry/common.c:98 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> Fix this race condition by clearing the JOBCTL_PENDING_MASK for the calling thread in zap_other_threads(), ensuring it does not retain any stale job control state after the thread group is destroyed. This aligns with other functions that tear down a thread group and abort group stops, such as zap_process() and complete_signal(), which correctly clear these flags for all threads including the current one.

Risk And Classification

EPSS: 0.001640000 probability, percentile 0.059860000 (date 2026-07-02)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 39efa3ef3a376a4e53de2f82fc91182459d34200 2b32b2fb241435145ea199efac024540759d2495 git Not specified
CNA Linux Linux affected 39efa3ef3a376a4e53de2f82fc91182459d34200 391ebe74456a0f1d60b3ba4a8a64d9f44c1728fe git Not specified
CNA Linux Linux affected 39efa3ef3a376a4e53de2f82fc91182459d34200 f8d720bc2e35d568c18be0644e92a468de428370 git Not specified
CNA Linux Linux affected 39efa3ef3a376a4e53de2f82fc91182459d34200 f4aae11abb449dc536269705d0419ec69480faa9 git Not specified
CNA Linux Linux affected 39efa3ef3a376a4e53de2f82fc91182459d34200 76aebd9ef20078719dfd6282d3b06c27e900a65a git Not specified
CNA Linux Linux affected 39efa3ef3a376a4e53de2f82fc91182459d34200 8c046f36222c6ce1e0daef2c45c891c72602f8a1 git Not specified
CNA Linux Linux affected 39efa3ef3a376a4e53de2f82fc91182459d34200 dfcd0ba14769d94d76ac9d9814b85e7fcacd4e29 git Not specified
CNA Linux Linux affected 39efa3ef3a376a4e53de2f82fc91182459d34200 90918794a4e2c3b440f8fcf3847765a8b1d81b25 git Not specified
CNA Linux Linux affected 3.0 Not specified
CNA Linux Linux unaffected 3.0 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/dfcd0ba14769d94d76ac9d9814b85e7fcacd4e29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/76aebd9ef20078719dfd6282d3b06c27e900a65a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f4aae11abb449dc536269705d0419ec69480faa9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/391ebe74456a0f1d60b3ba4a8a64d9f44c1728fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8c046f36222c6ce1e0daef2c45c891c72602f8a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f8d720bc2e35d568c18be0644e92a468de428370 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b32b2fb241435145ea199efac024540759d2495 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/90918794a4e2c3b440f8fcf3847765a8b1d81b25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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