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

CVE-2026-98695: USB: serial: fix ioctl hangup race

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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 24d6edb6bd7f7a9e6cee2f8fe435781daab8aa0f, 3a728adbed9fd822f99a9d9c5ebad5c3b565ba4a, 4597ddd6168ae2a4123404e5f0871f1070dc7773; 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 6.6.161.1-1.

Low priority for now. Upgrade to Linux Linux 24d6edb6bd7f7a9e6cee2f8fe435781daab8aa0f, 3a728adbed9fd822f99a9d9c5ebad5c3b565ba4a, 4597ddd6168ae2a4123404e5f0871f1070dc7773; 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 6.6.161.1-1 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: USB: serial: fix ioctl hangup race The tty ioctls can race with hangup and end up calling into a tty driver for a device that is already gone or powered down. Serialise the callbacks using the tty port mutex and add the missing checks to make sure the port has not been hung up before accessing port driver data or hardware. This specifically avoids dereferencing a NULL-pointer if a device is disconnected during lengthy break signalling. Note that TIOCGICOUNT and TIOCMIWAIT do not access port driver data or hardware and are therefore not affected by the race.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 11th 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 · 0.2%

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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

    • 2.6.26affected
    • f34d7a5b7010b82fe97da95496b9971435530062 and later · before c7ef25e96dc3f808eb891bbbd43b6a682846eb0caffected · git
    • f34d7a5b7010b82fe97da95496b9971435530062 and later · before 98f0a25134bfce44ebd1db0341fa0e8603ff276daffected · git
    • f34d7a5b7010b82fe97da95496b9971435530062 and later · before 3a728adbed9fd822f99a9d9c5ebad5c3b565ba4aaffected · git
    • f34d7a5b7010b82fe97da95496b9971435530062 and later · before 24d6edb6bd7f7a9e6cee2f8fe435781daab8aa0faffected · git
    • f34d7a5b7010b82fe97da95496b9971435530062 and later · before ae0da9a5c1ca95c20cc5feffd511ce6eae75924eaffected · git
    • f34d7a5b7010b82fe97da95496b9971435530062 and later · before 4597ddd6168ae2a4123404e5f0871f1070dc7773affected · git
    • f34d7a5b7010b82fe97da95496b9971435530062 and later · before 7912a95d1345c77d8d63b530b00c118700b78abdaffected · git
    • f34d7a5b7010b82fe97da95496b9971435530062 and later · before ae0e61d95677efa778379853e495d748e6efbf95affected · git
    • before 2.6.26not 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-2026-98693Oct 18, 2026 · thunderbolt: Hold a router reference for each allocated HopID
    0Monitor
  • ← EarlierCVE-2026-98694Oct 18, 2026 · thunderbolt: Fix KASAN reported use-after-free when request is canceled
    0Monitor
  • Later →CVE-2026-98696Oct 18, 2026 · USB: serial: fix driver deregistration order
    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 Linux24d6edb6bd7f7a9e6cee2f8fe435781daab8aa0fVendor (CNA)
Linux Linux3a728adbed9fd822f99a9d9c5ebad5c3b565ba4aVendor (CNA)
Linux Linux4597ddd6168ae2a4123404e5f0871f1070dc7773Vendor (CNA)
Linux Linux7912a95d1345c77d8d63b530b00c118700b78abdVendor (CNA)
Linux Linux98f0a25134bfce44ebd1db0341fa0e8603ff276dVendor (CNA)
Linux Linuxae0da9a5c1ca95c20cc5feffd511ce6eae75924eVendor (CNA)
Linux Linuxae0e61d95677efa778379853e495d748e6efbf95Vendor (CNA)
Linux Linuxc7ef25e96dc3f808eb891bbbd43b6a682846eb0cVendor (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 3.06.6.161.1-1 · Release 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 10, 2026+23 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 (7 more)

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

All records