VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98748: Linux kernel · serial: 8250_bcm7271: fix use-after-free in brcmuart_remove()

Source GCVE Database

Authoritative record:CVE-2026-98748

Not known to be exploited · fixed in f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e, e32440fa536af96bdbc61d933a7c3a920b965edc, dd81650bec58ac70e5dfde2ec390acc1f0d1ed76 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-7g75-q55x-6r4j

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 41a469482de257ea8db43cf74b6311bd055de030, < f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e	Fixed in f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e
LinuxLinux	Affected ≥ 41a469482de257ea8db43cf74b6311bd055de030, < e32440fa536af96bdbc61d933a7c3a920b965edc	Fixed in e32440fa536af96bdbc61d933a7c3a920b965edc
LinuxLinux	Affected ≥ 41a469482de257ea8db43cf74b6311bd055de030, < dd81650bec58ac70e5dfde2ec390acc1f0d1ed76	Fixed in dd81650bec58ac70e5dfde2ec390acc1f0d1ed76
LinuxLinux	Affected ≥ 41a469482de257ea8db43cf74b6311bd055de030, < 0794ba5332754866b2f1c0cca668775be3ffcf0a	Fixed in 0794ba5332754866b2f1c0cca668775be3ffcf0a
LinuxLinux	Affected ≥ 41a469482de257ea8db43cf74b6311bd055de030, < 189b9dc8c96ec9486482f27c1372b04a7152175e	Fixed in 189b9dc8c96ec9486482f27c1372b04a7152175e
LinuxLinux	Affected =5.13	Fixed in–

AI-suggested

A fix is available that changes the order of operations in the brcmuart_remove() function to unregister the port before cancelling the high-resolution timer. Users should update their Linux kernel to a version that includes this fix. Since this is a kernel-level issue, applying the official kernel patch or upgrading to a fixed kernel version is the recommended remediation.

Description

A use-after-free vulnerability in the Linux kernel's serial driver for 8250_bcm7271 was resolved by changing the order of operations in the brcmuart_remove() function. The flaw allowed a timer callback to access freed memory due to a race condition between unregistering the port and cancelling a high-resolution timer. This issue was identified via static analysis and fixed by unregistering the port before cancelling the timer to prevent the callback from running on freed memory.

References

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