VulnerabilityPublished 18 Oct 2026

CVE-2026-98695: Linux kernel · USB: serial: fix ioctl hangup race

Source GCVE Database

Authoritative record:CVE-2026-98695

Not known to be exploited · fixed in ae0e61d95677efa778379853e495d748e6efbf95 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in ae0e61d95677efa778379853e495d748e6efbf95, ae0da9a5c1ca95c20cc5feffd511ce6eae75924e, 7912a95d1345c77d8d63b530b00c118700b78abd +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-w8fg-4vmm-x6q5

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ f34d7a5b7010b82fe97da95496b9971435530062, < ae0e61d95677efa778379853e495d748e6efbf95	Fixed in ae0e61d95677efa778379853e495d748e6efbf95
LinuxLinux	Affected ≥ f34d7a5b7010b82fe97da95496b9971435530062, < ae0da9a5c1ca95c20cc5feffd511ce6eae75924e	Fixed in ae0da9a5c1ca95c20cc5feffd511ce6eae75924e
LinuxLinux	Affected ≥ f34d7a5b7010b82fe97da95496b9971435530062, < 7912a95d1345c77d8d63b530b00c118700b78abd	Fixed in 7912a95d1345c77d8d63b530b00c118700b78abd
LinuxLinux	Affected ≥ f34d7a5b7010b82fe97da95496b9971435530062, < 4597ddd6168ae2a4123404e5f0871f1070dc7773	Fixed in 4597ddd6168ae2a4123404e5f0871f1070dc7773
LinuxLinux	Affected ≥ f34d7a5b7010b82fe97da95496b9971435530062, < 24d6edb6bd7f7a9e6cee2f8fe435781daab8aa0f	Fixed in 24d6edb6bd7f7a9e6cee2f8fe435781daab8aa0f
LinuxLinux	Affected =2.6.26	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to serialize callbacks and add necessary checks to prevent accessing driver data after device hangup. Users should update to the patched kernel version once available. No additional mitigation is indicated.

Description

A race condition vulnerability in the Linux kernel's USB serial driver has been resolved. The issue involves tty ioctl operations racing with device hangup, potentially causing the driver to access a device that has been disconnected or powered down. This could lead to a NULL-pointer dereference during lengthy break signaling. Certain ioctls like TIOCGICOUNT and TIOCMIWAIT are not affected. The fix involves serializing callbacks with a mutex and adding checks to prevent accessing driver data after hangup.

References

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