{"id":"CVE-2026-98748","state":"PUBLISHED","title":"serial: 8250_bcm7271: fix use-after-free in brcmuart_remove()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250_bcm7271: fix use-after-free in brcmuart_remove()\n\nbrcmuart_handle_irq() starts priv->hrt to work around a receive-timeout\nquirk of the 8250 core when hardware flow control is enabled; the timer\ncallback brcmuart_hrtimer_func() dereferences priv.\n\nbrcmuart_remove() cancels the hrtimer before it unregisters the port, so\na receive-timeout interrupt that arrives in between re-arms the timer.\nAfter devm frees priv, the callback runs on freed memory.\n\nUnregister the port before cancelling the hrtimer.\nserial8250_unregister_port() shuts the port down and frees its IRQ, so\nbrcmuart_handle_irq() can no longer restart the timer, and the final\nhrtimer_cancel() drains any timer that was armed before or during the\nunregister.\n\nThis issue was found by an in-house static analysis tool.","publishedAt":"2026-10-18T15:47:33.446Z","updatedAt":"2026-10-30T12:39:18.369Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"134d239558f2ac2602fad2392ec3e6d8d76af7d8","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"dad9fb86829ee96bbc6315d7209ceb24820ef889","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"dd81650bec58ac70e5dfde2ec390acc1f0d1ed76","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"e32440fa536af96bdbc61d933a7c3a920b965edc","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"0794ba5332754866b2f1c0cca668775be3ffcf0a","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"189b9dc8c96ec9486482f27c1372b04a7152175e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/8250/8250_bcm7271.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.13","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/8250/8250_bcm7271.c"]}],"references":["https://git.kernel.org/stable/c/134d239558f2ac2602fad2392ec3e6d8d76af7d8","https://git.kernel.org/stable/c/dad9fb86829ee96bbc6315d7209ceb24820ef889","https://git.kernel.org/stable/c/dd81650bec58ac70e5dfde2ec390acc1f0d1ed76","https://git.kernel.org/stable/c/f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e","https://git.kernel.org/stable/c/e32440fa536af96bdbc61d933a7c3a920b965edc","https://git.kernel.org/stable/c/0794ba5332754866b2f1c0cca668775be3ffcf0a","https://git.kernel.org/stable/c/189b9dc8c96ec9486482f27c1372b04a7152175e"],"weaknesses":[],"ingestedAt":"2026-10-30T12:58:04.520Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98748.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98748","state":"PUBLISHED","datePublished":"2026-10-18T15:47:33.446Z","dateUpdated":"2026-10-30T12:39:18.369Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.367Z"},"containers":{"cna":{"title":"serial: 8250_bcm7271: fix use-after-free in brcmuart_remove()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250_bcm7271: fix use-after-free in brcmuart_remove()\n\nbrcmuart_handle_irq() starts priv->hrt to work around a receive-timeout\nquirk of the 8250 core when hardware flow control is enabled; the timer\ncallback brcmuart_hrtimer_func() dereferences priv.\n\nbrcmuart_remove() cancels the hrtimer before it unregisters the port, so\na receive-timeout interrupt that arrives in between re-arms the timer.\nAfter devm frees priv, the callback runs on freed memory.\n\nUnregister the port before cancelling the hrtimer.\nserial8250_unregister_port() shuts the port down and frees its IRQ, so\nbrcmuart_handle_irq() can no longer restart the timer, and the final\nhrtimer_cancel() drains any timer that was armed before or during the\nunregister.\n\nThis issue was found by an in-house static analysis tool."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"134d239558f2ac2602fad2392ec3e6d8d76af7d8","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"dad9fb86829ee96bbc6315d7209ceb24820ef889","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"dd81650bec58ac70e5dfde2ec390acc1f0d1ed76","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"e32440fa536af96bdbc61d933a7c3a920b965edc","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"0794ba5332754866b2f1c0cca668775be3ffcf0a","versionType":"git"},{"version":"41a469482de257ea8db43cf74b6311bd055de030","status":"affected","lessThan":"189b9dc8c96ec9486482f27c1372b04a7152175e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/8250/8250_bcm7271.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.13","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/8250/8250_bcm7271.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/134d239558f2ac2602fad2392ec3e6d8d76af7d8"},{"url":"https://git.kernel.org/stable/c/dad9fb86829ee96bbc6315d7209ceb24820ef889"},{"url":"https://git.kernel.org/stable/c/dd81650bec58ac70e5dfde2ec390acc1f0d1ed76"},{"url":"https://git.kernel.org/stable/c/f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e"},{"url":"https://git.kernel.org/stable/c/e32440fa536af96bdbc61d933a7c3a920b965edc"},{"url":"https://git.kernel.org/stable/c/0794ba5332754866b2f1c0cca668775be3ffcf0a"},{"url":"https://git.kernel.org/stable/c/189b9dc8c96ec9486482f27c1372b04a7152175e"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:39:18.369Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}