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CVE.org (no NVD analysis yet)· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 0794ba5332754866b2f1c0cca668775be3ffcf0a, 134d239558f2ac2602fad2392ec3e6d8d76af7d8, 189b9dc8c96ec9486482f27c1372b04a7152175e; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 0794ba5332754866b2f1c0cca668775be3ffcf0a, 134d239558f2ac2602fad2392ec3e6d8d76af7d8, 189b9dc8c96ec9486482f27c1372b04a7152175e; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.13affected
    • 41a469482de257ea8db43cf74b6311bd055de030 and later · before 134d239558f2ac2602fad2392ec3e6d8d76af7d8affected · git
    • 41a469482de257ea8db43cf74b6311bd055de030 and later · before dad9fb86829ee96bbc6315d7209ceb24820ef889affected · git
    • 41a469482de257ea8db43cf74b6311bd055de030 and later · before dd81650bec58ac70e5dfde2ec390acc1f0d1ed76affected · git
    • 41a469482de257ea8db43cf74b6311bd055de030 and later · before f5ce06e648d775cc1ccf66f4f594bb8b559a7d8eaffected · git
    • 41a469482de257ea8db43cf74b6311bd055de030 and later · before e32440fa536af96bdbc61d933a7c3a920b965edcaffected · git
    • 41a469482de257ea8db43cf74b6311bd055de030 and later · before 0794ba5332754866b2f1c0cca668775be3ffcf0aaffected · git
    • 41a469482de257ea8db43cf74b6311bd055de030 and later · before 189b9dc8c96ec9486482f27c1372b04a7152175eaffected · git
    • before 5.13not affected · semver
    • 5.15.224 and later · up to and including 5.15.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.10-17.2.10-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98746Oct 18, 2026 · serial: ma35d1: Fix clock reference leak in ma35d1serial_probe()
    0Monitor
  • ← EarlierCVE-2026-98747Oct 18, 2026 · serial: core: fix NULL pointer dereference in serial_core_unregister_port()
    0Monitor
  • Later →CVE-2026-98749Oct 18, 2026 · tty: serial: max3100: shut down timer before freeing port
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0794ba5332754866b2f1c0cca668775be3ffcf0aVendor (CNA)
Linux Linux134d239558f2ac2602fad2392ec3e6d8d76af7d8Vendor (CNA)
Linux Linux189b9dc8c96ec9486482f27c1372b04a7152175eVendor (CNA)
Linux Linuxdad9fb86829ee96bbc6315d7209ceb24820ef889Vendor (CNA)
Linux Linuxdd81650bec58ac70e5dfde2ec390acc1f0d1ed76Vendor (CNA)
Linux Linuxe32440fa536af96bdbc61d933a7c3a920b965edcVendor (CNA)
Linux Linuxf5ce06e648d775cc1ccf66f4f594bb8b559a7d8eVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 6, 2026+19 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records