serial: 8250_bcm7271: fix use-after-free in brcmuart_remove()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98748
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:28 UTC
Updated2026-10-19 10:19:38 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: serial: 8250_bcm7271: fix use-after-free in brcmuart_remove() brcmuart_handle_irq() starts priv->hrt to work around a receive-timeout quirk of the 8250 core when hardware flow control is enabled; the timer callback brcmuart_hrtimer_func() dereferences priv. brcmuart_remove() cancels the hrtimer before it unregisters the port, so a receive-timeout interrupt that arrives in between re-arms the timer. After devm frees priv, the callback runs on freed memory. Unregister the port before cancelling the hrtimer. serial8250_unregister_port() shuts the port down and frees its IRQ, so brcmuart_handle_irq() can no longer restart the timer, and the final hrtimer_cancel() drains any timer that was armed before or during the unregister. This issue was found by an in-house static analysis tool.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 41a469482de257ea8db43cf74b6311bd055de030 f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e git Not specified
CNA Linux Linux affected 41a469482de257ea8db43cf74b6311bd055de030 e32440fa536af96bdbc61d933a7c3a920b965edc git Not specified
CNA Linux Linux affected 41a469482de257ea8db43cf74b6311bd055de030 0794ba5332754866b2f1c0cca668775be3ffcf0a git Not specified
CNA Linux Linux affected 41a469482de257ea8db43cf74b6311bd055de030 189b9dc8c96ec9486482f27c1372b04a7152175e git Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 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/e32440fa536af96bdbc61d933a7c3a920b965edc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0794ba5332754866b2f1c0cca668775be3ffcf0a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/189b9dc8c96ec9486482f27c1372b04a7152175e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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