{"id":"CVE-2026-98749","state":"PUBLISHED","title":"tty: serial: max3100: shut down timer before freeing port","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: max3100: shut down timer before freeing port\n\nmax3100_shutdown() stops the polling timer but returns early during\nsystem suspend. If the SPI device is unbound before resume, the serial\ncore does not call max3100_shutdown() again, so max3100_remove() frees\nthe port while the timer remains armed. max3100_timeout() may then\naccess the freed port and re-arm the timer.\n\nAdd final timer teardown to max3100_remove() and use\ntimer_shutdown_sync() to prevent a racing callback from re-arming it.\nAlso free the IRQ and destroy the workqueue there before freeing the\nport. Keep timer_delete_sync() in max3100_shutdown() so that a\nsubsequent open() can re-arm the timer.\n\nThe workqueue is created before request_irq() and destroyed on both\nrequest_irq() failure and normal shutdown. Its presence at remove thus\nidentifies the IRQ left registered when suspend bypasses shutdown.\n\nFree the IRQ before destroying the workqueue, in both\nmax3100_shutdown() and max3100_remove(), and cancel the pending work\nin between. free_irq() waits for a running interrupt handler to\nfinish and no new handler can start afterwards, so a racing handler\ncannot queue work on a workqueue that is being destroyed; the\nforce_end_work check in max3100_dowork() only narrows that window, as\na handler delayed between the check and queue_work() could still run\nafter the teardown has cleared the workqueue pointer. Cancelling the\nwork also keeps destroy_workqueue() from waiting on a queued work item\nin case remove() ever runs while the freezable workqueue is still\nfrozen, e.g. device removal during the resume window, before\nworkqueues are thawed.\n\nThis issue was found by an in-house static analysis tool.","publishedAt":"2026-10-18T15:47:34.347Z","updatedAt":"2026-10-30T12:39:19.454Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"d1187a7deac1e90182372a188dfe33ddd2b53cba","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"cbb3fcc7cd14396ccc1379c164d96a247331f2e6","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"fb8cefd66a6055a313c993fa9e8bed9be9b088f6","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"158a07da2da720f2f98b4bea129212c6805d8ee0","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"fb668620e3b163962dabe1a674725a07aa44ff4a","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"2c8614981d3e6e000427de0ab2426ab68274d850","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"247b8f680876313586aed4d267bfcceddc2b4901","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"db0949bbd06db0a75b4b1076f1e25194be7d956a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/max3100.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/max3100.c"]}],"references":["https://git.kernel.org/stable/c/d1187a7deac1e90182372a188dfe33ddd2b53cba","https://git.kernel.org/stable/c/cbb3fcc7cd14396ccc1379c164d96a247331f2e6","https://git.kernel.org/stable/c/fb8cefd66a6055a313c993fa9e8bed9be9b088f6","https://git.kernel.org/stable/c/158a07da2da720f2f98b4bea129212c6805d8ee0","https://git.kernel.org/stable/c/fb668620e3b163962dabe1a674725a07aa44ff4a","https://git.kernel.org/stable/c/2c8614981d3e6e000427de0ab2426ab68274d850","https://git.kernel.org/stable/c/247b8f680876313586aed4d267bfcceddc2b4901","https://git.kernel.org/stable/c/db0949bbd06db0a75b4b1076f1e25194be7d956a"],"weaknesses":[],"ingestedAt":"2026-10-30T12:58:04.520Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98749.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98749","state":"PUBLISHED","datePublished":"2026-10-18T15:47:34.347Z","dateUpdated":"2026-10-30T12:39:19.454Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.368Z"},"containers":{"cna":{"title":"tty: serial: max3100: shut down timer before freeing port","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: max3100: shut down timer before freeing port\n\nmax3100_shutdown() stops the polling timer but returns early during\nsystem suspend. If the SPI device is unbound before resume, the serial\ncore does not call max3100_shutdown() again, so max3100_remove() frees\nthe port while the timer remains armed. max3100_timeout() may then\naccess the freed port and re-arm the timer.\n\nAdd final timer teardown to max3100_remove() and use\ntimer_shutdown_sync() to prevent a racing callback from re-arming it.\nAlso free the IRQ and destroy the workqueue there before freeing the\nport. Keep timer_delete_sync() in max3100_shutdown() so that a\nsubsequent open() can re-arm the timer.\n\nThe workqueue is created before request_irq() and destroyed on both\nrequest_irq() failure and normal shutdown. Its presence at remove thus\nidentifies the IRQ left registered when suspend bypasses shutdown.\n\nFree the IRQ before destroying the workqueue, in both\nmax3100_shutdown() and max3100_remove(), and cancel the pending work\nin between. free_irq() waits for a running interrupt handler to\nfinish and no new handler can start afterwards, so a racing handler\ncannot queue work on a workqueue that is being destroyed; the\nforce_end_work check in max3100_dowork() only narrows that window, as\na handler delayed between the check and queue_work() could still run\nafter the teardown has cleared the workqueue pointer. Cancelling the\nwork also keeps destroy_workqueue() from waiting on a queued work item\nin case remove() ever runs while the freezable workqueue is still\nfrozen, e.g. device removal during the resume window, before\nworkqueues are thawed.\n\nThis issue was found by an in-house static analysis tool."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"d1187a7deac1e90182372a188dfe33ddd2b53cba","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"cbb3fcc7cd14396ccc1379c164d96a247331f2e6","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"fb8cefd66a6055a313c993fa9e8bed9be9b088f6","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"158a07da2da720f2f98b4bea129212c6805d8ee0","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"fb668620e3b163962dabe1a674725a07aa44ff4a","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"2c8614981d3e6e000427de0ab2426ab68274d850","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"247b8f680876313586aed4d267bfcceddc2b4901","versionType":"git"},{"version":"7831d56b0a3544cbb6f82f76c34ca95e24d5b676","status":"affected","lessThan":"db0949bbd06db0a75b4b1076f1e25194be7d956a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/max3100.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/max3100.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d1187a7deac1e90182372a188dfe33ddd2b53cba"},{"url":"https://git.kernel.org/stable/c/cbb3fcc7cd14396ccc1379c164d96a247331f2e6"},{"url":"https://git.kernel.org/stable/c/fb8cefd66a6055a313c993fa9e8bed9be9b088f6"},{"url":"https://git.kernel.org/stable/c/158a07da2da720f2f98b4bea129212c6805d8ee0"},{"url":"https://git.kernel.org/stable/c/fb668620e3b163962dabe1a674725a07aa44ff4a"},{"url":"https://git.kernel.org/stable/c/2c8614981d3e6e000427de0ab2426ab68274d850"},{"url":"https://git.kernel.org/stable/c/247b8f680876313586aed4d267bfcceddc2b4901"},{"url":"https://git.kernel.org/stable/c/db0949bbd06db0a75b4b1076f1e25194be7d956a"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:39:19.454Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}