serial: 8250_bcm7271: fix use-after-free in brcmuart_remove()
Summary
| CVE | CVE-2026-98748 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-18 16:17:28 UTC |
| Updated | 2026-10-30 13:21:23 UTC |
| Description | In 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. |
Risk And Classification
EPSS: 0.001720000 probability, percentile 0.066120000 (date 2026-11-01)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 41a469482de257ea8db43cf74b6311bd055de030 134d239558f2ac2602fad2392ec3e6d8d76af7d8 git | Not specified |
| CNA | Linux | Linux | affected 41a469482de257ea8db43cf74b6311bd055de030 dad9fb86829ee96bbc6315d7209ceb24820ef889 git | Not specified |
| CNA | Linux | Linux | affected 41a469482de257ea8db43cf74b6311bd055de030 dd81650bec58ac70e5dfde2ec390acc1f0d1ed76 git | Not specified |
| 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 5.15.224 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.191 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.160 6.6.* 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
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/e32440fa536af96bdbc61d933a7c3a920b965edc | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/dd81650bec58ac70e5dfde2ec390acc1f0d1ed76 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/134d239558f2ac2602fad2392ec3e6d8d76af7d8 | 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 | |
| git.kernel.org/stable/c/dad9fb86829ee96bbc6315d7209ceb24820ef889 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.