CVE-2026-64340USB: legousbtower: fix use-after-free on disconnect race
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: USB: legousbtower: fix use-after-free on disconnect race mutex_unlock() may access the mutex structure after releasing the lock and therefore cannot be used to manage lifetime of objects directly (unlike spinlocks and refcounts). [1][2] Use a kref to release the driver data to avoid use-after-free in mutex_unlock() when release() races with disconnect(). [1] a51749ab34d9 ("locking/mutex: Document that mutex_unlock() is non-atomic") [2] 2b9d9e0a9ba0 ("locking/mutex: Clarify that mutex_unlock(), and most other sleeping locks, can still use the lock object after it's unlocked")
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 98% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 18bcbcfe9ca2308ebffb40068b51803da9315d97 – < 11d069f85851997b4ea0adf242ed9672dc749b8f
- affected 18bcbcfe9ca2308ebffb40068b51803da9315d97 – < b4222c05066b252b451f9c8c4730b5b60824ea66
- affected 18bcbcfe9ca2308ebffb40068b51803da9315d97 – < 6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee
- affected 18bcbcfe9ca2308ebffb40068b51803da9315d97 – < 0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e
- affected 18bcbcfe9ca2308ebffb40068b51803da9315d97 – < ab2bfd7bec4f134b377ec42f513e90c35db94160
- affected 18bcbcfe9ca2308ebffb40068b51803da9315d97 – < 766738ecf2b819e54d38763c8d1c8ae6cff14b39
- affected 18bcbcfe9ca2308ebffb40068b51803da9315d97 – < 9ba62966461a8e3cc593b62c56ec62eb2d80436d
- affected 18bcbcfe9ca2308ebffb40068b51803da9315d97 – < 62fc8eb1b1481051f7bab4aa93d79809053dd09f
- affected 2.6.25
- unaffected < 2.6.25
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/11d069f85851997b4ea0adf242ed9672dc749b8f (opens in a new tab)
- https://git.kernel.org/stable/c/b4222c05066b252b451f9c8c4730b5b60824ea66 (opens in a new tab)
- https://git.kernel.org/stable/c/6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee (opens in a new tab)
- https://git.kernel.org/stable/c/0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e (opens in a new tab)
- https://git.kernel.org/stable/c/ab2bfd7bec4f134b377ec42f513e90c35db94160 (opens in a new tab)
- https://git.kernel.org/stable/c/766738ecf2b819e54d38763c8d1c8ae6cff14b39 (opens in a new tab)
- https://git.kernel.org/stable/c/9ba62966461a8e3cc593b62c56ec62eb2d80436d (opens in a new tab)
- https://git.kernel.org/stable/c/62fc8eb1b1481051f7bab4aa93d79809053dd09f (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48884 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64340)Record last updated .