CVE-2025-22040

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-22040", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.809Z", "datePublished": "2025-04-16T14:11:57.601Z", "dateUpdated": "2026-08-05T11:56:13.212Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:56:13.212Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix session use-after-free in multichannel connection\n\nThere is a race condition between session setup and\nksmbd_sessions_deregister. The session can be freed before the connection\nis added to channel list of session.\nThis patch check reference count of session before freeing it."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "ksmbd multichannel session UAF. Attacker authenticates on connection 1, initiates multichannel binding on connection 2, disconnects connection 1 during setup. All steps are attacker-initiated, race is fully attacker-controlled. Network-reachable."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/auth.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/smb2pdu.c"], "versions": [{"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "596407adb9af1ee75fe7c7529607783d31b66e7f", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "3980770cb1470054e6400fd97668665975726737", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "9069939d762138e232a6f79e3e1462682ed6a17d", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "94c281721d4ed2d972232414b91d98a6f5bdb16b", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "7dfbd4c43eed91dd2548a95236908025707a8dfd", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/auth.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/smb2pdu.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.134", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.87", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.23", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.11", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14.2", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.87"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.23"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.13.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.14.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/596407adb9af1ee75fe7c7529607783d31b66e7f"}, {"url": "https://git.kernel.org/stable/c/3980770cb1470054e6400fd97668665975726737"}, {"url": "https://git.kernel.org/stable/c/9069939d762138e232a6f79e3e1462682ed6a17d"}, {"url": "https://git.kernel.org/stable/c/94c281721d4ed2d972232414b91d98a6f5bdb16b"}, {"url": "https://git.kernel.org/stable/c/7dfbd4c43eed91dd2548a95236908025707a8dfd"}, {"url": "https://git.kernel.org/stable/c/fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db"}], "title": "ksmbd: fix session use-after-free in multichannel connection", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-22040", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-04-21T14:57:48.411411Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-04-21T15:01:46.532Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:41:21.699Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:41:21.699Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-22040", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-04-21T14:57:48.411411Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-04-21T14:57:50.108Z"}}], "cna": {"title": "ksmbd: fix session use-after-free in multichannel connection", "metrics": [{"cvssV3_1": {"version": "3.1", "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"}}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "596407adb9af1ee75fe7c7529607783d31b66e7f", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "3980770cb1470054e6400fd97668665975726737", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "9069939d762138e232a6f79e3e1462682ed6a17d", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "94c281721d4ed2d972232414b91d98a6f5bdb16b", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "7dfbd4c43eed91dd2548a95236908025707a8dfd", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db", "versionType": "git"}], "programFiles": ["fs/smb/server/auth.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/smb2pdu.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"status": "unaffected", "version": "0", "lessThan": "5.15", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.134", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.87", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.23", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13.11", "versionType": "semver", "lessThanOrEqual": "6.13.*"}, {"status": "unaffected", "version": "6.14.2", "versionType": "semver", "lessThanOrEqual": "6.14.*"}, {"status": "unaffected", "version": "6.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/server/auth.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/smb2pdu.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/596407adb9af1ee75fe7c7529607783d31b66e7f"}, {"url": "https://git.kernel.org/stable/c/3980770cb1470054e6400fd97668665975726737"}, {"url": "https://git.kernel.org/stable/c/9069939d762138e232a6f79e3e1462682ed6a17d"}, {"url": "https://git.kernel.org/stable/c/94c281721d4ed2d972232414b91d98a6f5bdb16b"}, {"url": "https://git.kernel.org/stable/c/7dfbd4c43eed91dd2548a95236908025707a8dfd"}, {"url": "https://git.kernel.org/stable/c/fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix session use-after-free in multichannel connection\n\nThere is a race condition between session setup and\nksmbd_sessions_deregister. The session can be freed before the connection\nis added to channel list of session.\nThis patch check reference count of session before freeing it."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.134", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.87", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.23", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13.11", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.14.2", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.15", "versionStartIncluding": "5.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-04-02T08:39:28.919Z"}}}, "cveMetadata": {"cveId": "CVE-2025-22040", "state": "PUBLISHED", "dateUpdated": "2026-04-02T08:39:28.919Z", "dateReserved": "2024-12-29T08:45:45.809Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-04-16T14:11:57.601Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/server/auth.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/smb2pdu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "596407adb9af1ee75fe7c7529607783d31b66e7f", "status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "versionType": "git"}, {"lessThan": "3980770cb1470054e6400fd97668665975726737", "status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "versionType": "git"}, {"lessThan": "9069939d762138e232a6f79e3e1462682ed6a17d", "status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "versionType": "git"}, {"lessThan": "94c281721d4ed2d972232414b91d98a6f5bdb16b", "status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "versionType": "git"}, {"lessThan": "7dfbd4c43eed91dd2548a95236908025707a8dfd", "status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "versionType": "git"}, {"lessThan": "fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db", "status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/server/auth.c", "fs/smb/server/mgmt/user_session.c", "fs/smb/server/smb2pdu.c"], "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": "6.1.*", "status": "unaffected", "version": "6.1.134", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.87", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.23", "versionType": "semver"}, {"lessThanOrEqual": "6.13.*", "status": "unaffected", "version": "6.13.11", "versionType": "semver"}, {"lessThanOrEqual": "6.14.*", "status": "unaffected", "version": "6.14.2", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.15", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "93D760D4-D24F-4EF7-B8D3-E0D32EB225C4", "versionEndExcluding": "6.1.134", "versionStartIncluding": "5.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "EFF24260-49B1-4251-9477-C564CFDAD25B", "versionEndExcluding": "6.6.87", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "26CAB76D-F00F-43CE-BEAD-7097F8FB1D6C", "versionEndExcluding": "6.12.23", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E7E864B0-8C00-4679-BA55-659B4C9C3AD3", "versionEndExcluding": "6.13.11", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FADAE5D8-4808-442C-B218-77B2CE8780A0", "versionEndExcluding": "6.14.2", "versionStartIncluding": "6.14", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix session use-after-free in multichannel connection\n\nThere is a race condition between session setup and\nksmbd_sessions_deregister. The session can be freed before the connection\nis added to channel list of session.\nThis patch check reference count of session before freeing it."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: corregir sesi\u00f3n use-after-free en conexi\u00f3n multicanal. Existe una condici\u00f3n de ejecuci\u00f3n entre la configuraci\u00f3n de la sesi\u00f3n y ksmbd_sessions_deregister. La sesi\u00f3n puede liberarse antes de que la conexi\u00f3n se a\u00f1ada a la lista de canales de la sesi\u00f3n. Este parche comprueba el n\u00famero de referencias de la sesi\u00f3n antes de liberarla."}], "id": "CVE-2025-22040", "lastModified": "2026-06-17T08:44:54.640", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-22040", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-04-21T14:57:48.411411Z", "version": "2.0.3"}}]}, "published": "2025-04-16T15:15:56.590", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3980770cb1470054e6400fd97668665975726737"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/596407adb9af1ee75fe7c7529607783d31b66e7f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7dfbd4c43eed91dd2548a95236908025707a8dfd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9069939d762138e232a6f79e3e1462682ed6a17d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94c281721d4ed2d972232414b91d98a6f5bdb16b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ksmbd: fix session use-after-free in multichannel connection", "id": "2360242", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2360242"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nksmbd: fix session use-after-free in multichannel connection\nThere is a race condition between session setup and\nksmbd_sessions_deregister. The session can be freed before the connection\nis added to channel list of session.\nThis patch check reference count of session before freeing it."], "name": "CVE-2025-22040", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-04-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-22040\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-22040\nhttps://lore.kernel.org/linux-cve-announce/2025041659-CVE-2025-22040-27ed@gregkh/T"], "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-28T02:18:24.299860+00:00", "value": {"mitigation_remediation": ["Update the Linux kernel to a version that includes the ksmbd session use\u2011after\u2011free fix (see commit 3980770cb1 and related patches).", "If an immediate kernel upgrade is not possible, disable or restrict SMB multichannel support on the server by configuring the SMB daemon or by using firewall rules to block SMB traffic from untrusted networks.", "Continuously monitor for anomalous SMB activity and apply additional hardening such as restricting SMB to trusted hosts or using SELinux/AppArmor profiles to limit kernel access."], "summary": {"action": "Immediate Patch", "impact": "Memory corruption in the kernel that could lead to privilege escalation"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the Linux kernel as used by Debian Linux 11.0 and by any Linux system running a kernel version that has not been patched for the ksmbd session use\u2011after\u2011free. The official references list commits that address the issue, indicating that only kernels prior to those patches are vulnerable.", "description_and_impact": "A race condition exists in the Linux kernel\u2019s ksmbd component that allows a session to be freed before it is fully registered in the channel list. This results in a use\u2011after\u2011free situation, which can corrupt kernel memory. Though the description does not specify a concrete exploit, such memory corruption can enable an attacker to gain privileged access or cause a denial of service.", "risk_and_exploitability": "The CVSS score of 8.8 indicates a high severity impact. The EPSS score of less than 1\u202f% suggests that the likelihood of exploitation is low, and the vulnerability is not yet listed in CISA\u2019s KEV catalog. The attack vector is inferred to be local or requires the ability to send specially crafted SMB requests to the affected server, enabling a race condition that results in the memory corruption described above."}}}}, "created": "2026-04-28T02:30:18.739394+00:00", "updated": "2026-04-28T02:30:18.739405+00:00", "vendors": []}