{"id":"CVE-2026-64340","state":"PUBLISHED","title":"USB: legousbtower: fix use-after-free on disconnect race","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: legousbtower: fix use-after-free on disconnect race\n\nmutex_unlock() may access the mutex structure after releasing the lock\nand therefore cannot be used to manage lifetime of objects directly\n(unlike spinlocks and refcounts). [1][2]\n\nUse a kref to release the driver data to avoid use-after-free in\nmutex_unlock() when release() races with disconnect().\n\n[1] a51749ab34d9 (\"locking/mutex: Document that mutex_unlock() is\n                   non-atomic\")\n[2] 2b9d9e0a9ba0 (\"locking/mutex: Clarify that mutex_unlock(), and most\n                   other sleeping locks, can still use the lock object\n                   after it's unlocked\")","publishedAt":"2026-07-25T08:50:03.896Z","updatedAt":"2026-08-17T04:53:43.875Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"11d069f85851997b4ea0adf242ed9672dc749b8f","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"b4222c05066b252b451f9c8c4730b5b60824ea66","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"ab2bfd7bec4f134b377ec42f513e90c35db94160","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"766738ecf2b819e54d38763c8d1c8ae6cff14b39","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"9ba62966461a8e3cc593b62c56ec62eb2d80436d","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"62fc8eb1b1481051f7bab4aa93d79809053dd09f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/misc/legousbtower.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.25","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.25","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/misc/legousbtower.c"]}],"references":["https://git.kernel.org/stable/c/11d069f85851997b4ea0adf242ed9672dc749b8f","https://git.kernel.org/stable/c/b4222c05066b252b451f9c8c4730b5b60824ea66","https://git.kernel.org/stable/c/6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee","https://git.kernel.org/stable/c/0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e","https://git.kernel.org/stable/c/ab2bfd7bec4f134b377ec42f513e90c35db94160","https://git.kernel.org/stable/c/766738ecf2b819e54d38763c8d1c8ae6cff14b39","https://git.kernel.org/stable/c/9ba62966461a8e3cc593b62c56ec62eb2d80436d","https://git.kernel.org/stable/c/62fc8eb1b1481051f7bab4aa93d79809053dd09f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64340.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64340","state":"PUBLISHED","datePublished":"2026-07-25T08:50:03.896Z","dateUpdated":"2026-08-17T04:53:43.875Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.781Z"},"containers":{"cna":{"title":"USB: legousbtower: fix use-after-free on disconnect race","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: legousbtower: fix use-after-free on disconnect race\n\nmutex_unlock() may access the mutex structure after releasing the lock\nand therefore cannot be used to manage lifetime of objects directly\n(unlike spinlocks and refcounts). [1][2]\n\nUse a kref to release the driver data to avoid use-after-free in\nmutex_unlock() when release() races with disconnect().\n\n[1] a51749ab34d9 (\"locking/mutex: Document that mutex_unlock() is\n                   non-atomic\")\n[2] 2b9d9e0a9ba0 (\"locking/mutex: Clarify that mutex_unlock(), and most\n                   other sleeping locks, can still use the lock object\n                   after it's unlocked\")"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"11d069f85851997b4ea0adf242ed9672dc749b8f","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"b4222c05066b252b451f9c8c4730b5b60824ea66","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"ab2bfd7bec4f134b377ec42f513e90c35db94160","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"766738ecf2b819e54d38763c8d1c8ae6cff14b39","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"9ba62966461a8e3cc593b62c56ec62eb2d80436d","versionType":"git"},{"version":"18bcbcfe9ca2308ebffb40068b51803da9315d97","status":"affected","lessThan":"62fc8eb1b1481051f7bab4aa93d79809053dd09f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/misc/legousbtower.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.25","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.25","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/misc/legousbtower.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/11d069f85851997b4ea0adf242ed9672dc749b8f"},{"url":"https://git.kernel.org/stable/c/b4222c05066b252b451f9c8c4730b5b60824ea66"},{"url":"https://git.kernel.org/stable/c/6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee"},{"url":"https://git.kernel.org/stable/c/0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e"},{"url":"https://git.kernel.org/stable/c/ab2bfd7bec4f134b377ec42f513e90c35db94160"},{"url":"https://git.kernel.org/stable/c/766738ecf2b819e54d38763c8d1c8ae6cff14b39"},{"url":"https://git.kernel.org/stable/c/9ba62966461a8e3cc593b62c56ec62eb2d80436d"},{"url":"https://git.kernel.org/stable/c/62fc8eb1b1481051f7bab4aa93d79809053dd09f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:53:43.875Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}