{"api_version":"1","generated_at":"2026-07-28T12:21:00+00:00","cve":"CVE-2026-64390","urls":{"html":"https://cve.report/CVE-2026-64390","api":"https://cve.report/api/cve/CVE-2026-64390.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64390","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64390"},"summary":{"title":"ksmbd: track the connection owning a byte-range lock","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: track the connection owning a byte-range lock\n\nSMB2_LOCK adds each granted byte-range lock to both the file lock list\nand the lock list of the connection which handled the request.  The\nfinal close and durable handle paths, however, remove the connection\nlist entry while holding fp->conn->llist_lock.\n\nWith SMB3 multichannel, the connection handling the LOCK request can be\ndifferent from the connection which opened the file.  The entry can\ntherefore be removed under a different spinlock from the one protecting\nthe list it belongs to.  A concurrent traversal can then access freed\nstruct ksmbd_lock and struct file_lock objects.\n\nRecord the connection owning each lock's clist entry and hold a\nreference to it while the entry is linked.  Use that connection and its\nllist_lock for unlock, rollback, close, and durable preserve.  Durable\nreconnect assigns the new connection as the owner when publishing the\nlocks again.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:22","updated_at":"2026-07-27 05:16:45"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/c1016dd1d8b2bcd1158bbaabe94a31bb7e7431fb","name":"https://git.kernel.org/stable/c/c1016dd1d8b2bcd1158bbaabe94a31bb7e7431fb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/66eb3643164e5e1029907793926c132f8b5c6148","name":"https://git.kernel.org/stable/c/66eb3643164e5e1029907793926c132f8b5c6148","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ea5c9bf99f626a15cc59f645dc895f2b3f01992e","name":"https://git.kernel.org/stable/c/ea5c9bf99f626a15cc59f645dc895f2b3f01992e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/22d38cf75b556c20b039743bdf3654d535b858be","name":"https://git.kernel.org/stable/c/22d38cf75b556c20b039743bdf3654d535b858be","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/427faaa52b0b399940c1a88065a5c310d10dad15","name":"https://git.kernel.org/stable/c/427faaa52b0b399940c1a88065a5c310d10dad15","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fe20d492a69a6f79e637f438072b212e21ed3b78","name":"https://git.kernel.org/stable/c/fe20d492a69a6f79e637f438072b212e21ed3b78","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5fecc15a30cb9ebd310f7b52c1ab607edcea78f6","name":"https://git.kernel.org/stable/c/5fecc15a30cb9ebd310f7b52c1ab607edcea78f6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64390","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64390","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f5a544e3bab78142207e0242d22442db85ba1eff 22d38cf75b556c20b039743bdf3654d535b858be git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f5a544e3bab78142207e0242d22442db85ba1eff 66eb3643164e5e1029907793926c132f8b5c6148 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f5a544e3bab78142207e0242d22442db85ba1eff ea5c9bf99f626a15cc59f645dc895f2b3f01992e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f5a544e3bab78142207e0242d22442db85ba1eff fe20d492a69a6f79e637f438072b212e21ed3b78 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64390","cve":"CVE-2026-64390","epss":"0.004670000","percentile":"0.378900000","score_date":"2026-07-27","updated_at":"2026-07-28 00:07:43"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/server/smb2pdu.c","fs/smb/server/vfs_cache.c","fs/smb/server/vfs_cache.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"22d38cf75b556c20b039743bdf3654d535b858be","status":"affected","version":"f5a544e3bab78142207e0242d22442db85ba1eff","versionType":"git"},{"lessThan":"66eb3643164e5e1029907793926c132f8b5c6148","status":"affected","version":"f5a544e3bab78142207e0242d22442db85ba1eff","versionType":"git"},{"lessThan":"ea5c9bf99f626a15cc59f645dc895f2b3f01992e","status":"affected","version":"f5a544e3bab78142207e0242d22442db85ba1eff","versionType":"git"},{"lessThan":"fe20d492a69a6f79e637f438072b212e21ed3b78","status":"affected","version":"f5a544e3bab78142207e0242d22442db85ba1eff","versionType":"git"},{"lessThan":"427faaa52b0b399940c1a88065a5c310d10dad15","status":"affected","version":"f5a544e3bab78142207e0242d22442db85ba1eff","versionType":"git"},{"lessThan":"5fecc15a30cb9ebd310f7b52c1ab607edcea78f6","status":"affected","version":"f5a544e3bab78142207e0242d22442db85ba1eff","versionType":"git"},{"lessThan":"c1016dd1d8b2bcd1158bbaabe94a31bb7e7431fb","status":"affected","version":"f5a544e3bab78142207e0242d22442db85ba1eff","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/server/smb2pdu.c","fs/smb/server/vfs_cache.c","fs/smb/server/vfs_cache.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.15"},{"lessThan":"5.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"5.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: track the connection owning a byte-range lock\n\nSMB2_LOCK adds each granted byte-range lock to both the file lock list\nand the lock list of the connection which handled the request.  The\nfinal close and durable handle paths, however, remove the connection\nlist entry while holding fp->conn->llist_lock.\n\nWith SMB3 multichannel, the connection handling the LOCK request can be\ndifferent from the connection which opened the file.  The entry can\ntherefore be removed under a different spinlock from the one protecting\nthe list it belongs to.  A concurrent traversal can then access freed\nstruct ksmbd_lock and struct file_lock objects.\n\nRecord the connection owning each lock's clist entry and hold a\nreference to it while the entry is linked.  Use that connection and its\nllist_lock for unlock, rollback, close, and durable preserve.  Durable\nreconnect assigns the new connection as the owner when publishing the\nlocks again."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-27T05:00:19.433Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/22d38cf75b556c20b039743bdf3654d535b858be"},{"url":"https://git.kernel.org/stable/c/66eb3643164e5e1029907793926c132f8b5c6148"},{"url":"https://git.kernel.org/stable/c/ea5c9bf99f626a15cc59f645dc895f2b3f01992e"},{"url":"https://git.kernel.org/stable/c/fe20d492a69a6f79e637f438072b212e21ed3b78"},{"url":"https://git.kernel.org/stable/c/427faaa52b0b399940c1a88065a5c310d10dad15"},{"url":"https://git.kernel.org/stable/c/5fecc15a30cb9ebd310f7b52c1ab607edcea78f6"},{"url":"https://git.kernel.org/stable/c/c1016dd1d8b2bcd1158bbaabe94a31bb7e7431fb"}],"title":"ksmbd: track the connection owning a byte-range lock","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64390","datePublished":"2026-07-25T08:50:37.406Z","dateReserved":"2026-07-19T15:36:31.785Z","dateUpdated":"2026-07-27T05:00:19.433Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:22","lastModifiedDate":"2026-07-27 05:16:45","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64390","Ordinal":"1","Title":"ksmbd: track the connection owning a byte-range lock","CVE":"CVE-2026-64390","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64390","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: track the connection owning a byte-range lock\n\nSMB2_LOCK adds each granted byte-range lock to both the file lock list\nand the lock list of the connection which handled the request.  The\nfinal close and durable handle paths, however, remove the connection\nlist entry while holding fp->conn->llist_lock.\n\nWith SMB3 multichannel, the connection handling the LOCK request can be\ndifferent from the connection which opened the file.  The entry can\ntherefore be removed under a different spinlock from the one protecting\nthe list it belongs to.  A concurrent traversal can then access freed\nstruct ksmbd_lock and struct file_lock objects.\n\nRecord the connection owning each lock's clist entry and hold a\nreference to it while the entry is linked.  Use that connection and its\nllist_lock for unlock, rollback, close, and durable preserve.  Durable\nreconnect assigns the new connection as the owner when publishing the\nlocks again.","Type":"Description","Title":"ksmbd: track the connection owning a byte-range lock"}]}}}