VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98772: Linux kernel · USB: serial: fix port tear down use-after-free

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e80ee74206f260eb1282e7d1339ff146a4a410d0 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

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 e80ee74206f260eb1282e7d1339ff146a4a410d0, e4a6883ad9b4686a5f4bd90ff55a44d7ab65bd3c, 60cc9379c3e650d1ebfba4de63f1242537a62a32 +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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 2d93148ab6988cad872e65d694c95e8944e1b626, < e80ee74206f260eb1282e7d1339ff146a4a410d0	Fixed in e80ee74206f260eb1282e7d1339ff146a4a410d0
LinuxLinux	Affected ≥ 2d93148ab6988cad872e65d694c95e8944e1b626, < e4a6883ad9b4686a5f4bd90ff55a44d7ab65bd3c	Fixed in e4a6883ad9b4686a5f4bd90ff55a44d7ab65bd3c
LinuxLinux	Affected ≥ 2d93148ab6988cad872e65d694c95e8944e1b626, < 60cc9379c3e650d1ebfba4de63f1242537a62a32	Fixed in 60cc9379c3e650d1ebfba4de63f1242537a62a32
LinuxLinux	Affected ≥ 2d93148ab6988cad872e65d694c95e8944e1b626, < 33c920f7c5952dfc42d1b8ea6efe16b1f0bb0c5b	Fixed in 33c920f7c5952dfc42d1b8ea6efe16b1f0bb0c5b
LinuxLinux	Affected ≥ 2d93148ab6988cad872e65d694c95e8944e1b626, < 5e8980a81af195c49084be5b4c031085b56c7443	Fixed in 5e8980a81af195c49084be5b4c031085b56c7443
LinuxLinux	Affected =2.6.30	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: fix port tear down use-after-free Some drivers for multiport devices access port driver data from completion handlers of shared URBs submitted at attach() or first open() and stopped at disconnect() or last close(), respectively. A simple NULL check before accessing the driver data makes sure that a port state container has at least been allocated, but a completion handler can still race with port tear down. Reorder the disconnect handling so that ports are not deregistered (and their driver data freed) until after all ports have been hung up and the driver disconnect() callback has run so that all I/O has been stopped.

References

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