tty: serial: max3100: shut down timer before freeing port

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Summary

CVECVE-2026-98749
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:28 UTC
Updated2026-10-19 10:19:39 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: tty: serial: max3100: shut down timer before freeing port max3100_shutdown() stops the polling timer but returns early during system suspend. If the SPI device is unbound before resume, the serial core does not call max3100_shutdown() again, so max3100_remove() frees the port while the timer remains armed. max3100_timeout() may then access the freed port and re-arm the timer. Add final timer teardown to max3100_remove() and use timer_shutdown_sync() to prevent a racing callback from re-arming it. Also free the IRQ and destroy the workqueue there before freeing the port. Keep timer_delete_sync() in max3100_shutdown() so that a subsequent open() can re-arm the timer. The workqueue is created before request_irq() and destroyed on both request_irq() failure and normal shutdown. Its presence at remove thus identifies the IRQ left registered when suspend bypasses shutdown. Free the IRQ before destroying the workqueue, in both max3100_shutdown() and max3100_remove(), and cancel the pending work in between. free_irq() waits for a running interrupt handler to finish and no new handler can start afterwards, so a racing handler cannot queue work on a workqueue that is being destroyed; the force_end_work check in max3100_dowork() only narrows that window, as a handler delayed between the check and queue_work() could still run after the teardown has cleared the workqueue pointer. Cancelling the work also keeps destroy_workqueue() from waiting on a queued work item in case remove() ever runs while the freezable workqueue is still frozen, e.g. device removal during the resume window, before workqueues are thawed. This issue was found by an in-house static analysis tool.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 fb668620e3b163962dabe1a674725a07aa44ff4a git Not specified
CNA Linux Linux affected 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 2c8614981d3e6e000427de0ab2426ab68274d850 git Not specified
CNA Linux Linux affected 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 247b8f680876313586aed4d267bfcceddc2b4901 git Not specified
CNA Linux Linux affected 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 db0949bbd06db0a75b4b1076f1e25194be7d956a git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/247b8f680876313586aed4d267bfcceddc2b4901 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fb668620e3b163962dabe1a674725a07aa44ff4a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/db0949bbd06db0a75b4b1076f1e25194be7d956a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2c8614981d3e6e000427de0ab2426ab68274d850 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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