serial: 8250_bcm7271: fix use-after-free in brcmuart_remove()
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.
CVE-2026-98748
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98748
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "41a469482de257ea8db43cf74b6311bd055de030",
"lessThan": "dd81650bec58ac70e5dfde2ec390acc1f0d1ed76",
"versionType": "git"
},
{
"status": "affected",
"version": "41a469482de257ea8db43cf74b6311bd055de030",
"lessThan": "f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e",
"versionType": "git"
},
{
"status": "affected",
"version": "41a469482de257ea8db43cf74b6311bd055de030",
"lessThan": "e32440fa536af96bdbc61d933a7c3a920b965edc",
"versionType": "git"
},
{
"status": "affected",
"version": "41a469482de257ea8db43cf74b6311bd055de030",
"lessThan": "0794ba5332754866b2f1c0cca668775be3ffcf0a",
"versionType": "git"
},
{
"status": "affected",
"version": "41a469482de257ea8db43cf74b6311bd055de030",
"lessThan": "189b9dc8c96ec9486482f27c1372b04a7152175e",
"versionType": "git"
}
],
"programFiles": [
"drivers/tty/serial/8250/8250_bcm7271.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/tty/serial/8250/8250_bcm7271.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98748
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48945 · Revision 1
- Added to Heist Feed
- Publisher date