CVE-2025-22074

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This can cause r_count\nto become negative, which can lead to a problem where the ksmbd\nthread does not terminate."}], "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": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445; the oplock/lease break path is driven entirely by SMB2 CREATE/WRITE/SET_INFO requests sent by a remote peer over the network.\nAC:L - The attacker owns both connections involved (the oplock holder and the breaker) and controls exactly how many unbalanced decrements occur by sending N writes, so `r_count` can be steered to zero or negative deterministically; no condition outside the attacker's control is needed.\nPR:L - Obtaining a level-II oplock or read-caching lease requires an open file handle, which requires a completed SMB2 session setup and tree connect with valid credentials \u2014 a low-privileged authenticated share user suffices.\nUI:N - The attacker triggers the oplock break itself by writing to or truncating the file from a second connection; no action by any local user or administrator is required.\nS:U - The corruption and its consequences (hung ksmbd kthread, freed ksmbd_conn/transport reuse) remain entirely within the kernel's own security authority.\nC:H - The underflow lets the connection teardown free `ksmbd_conn`, the transport and the socket while an in-flight work item still dereferences them, and the attacker can reoccupy that slab with request-buffer data, yielding a use-after-free read primitive over kernel memory including session keys and credentials.\nI:H - The same use-after-free gives writes through the stale `work->conn`/`work->sess` pointers and via `ksmbd_conn_write()` into freed and reallocated memory, which is the standard basis for heap-spray-driven control-flow hijacking.\nA:H - A negative `r_count` makes `wait_event(conn->r_count_q, r_count == 0)` unsatisfiable, hanging the `ksmbd:%u` kthread uninterruptibly and permanently leaking the socket, connection and sessions; this is repeatable per connection until resources are exhausted, and the UAF variant additionally causes kernel oopses."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/oplock.c"], "versions": [{"version": "8e6508c7ecb1802909f294827eff38f301d0c937", "lessThan": "8829849da3f68697b830a5b36047b0d8a50ae3ed", "status": "affected", "versionType": "git"}, {"version": "09aeab68033161cb54f194da93e51a11aee6144b", "lessThan": "4790bcb269e5d6d88200a67c54ae6d627332a3be", "status": "affected", "versionType": "git"}, {"version": "a4261bbc33fbf99b99c80aa3a2c5097611802980", "lessThan": "457db486203c90e10c3efc87fd45cc7000b1cd36", "status": "affected", "versionType": "git"}, {"version": "f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa", "lessThan": "20378cf48359f39dee0ef9b61470ebe77bd49c0d", "status": "affected", "versionType": "git"}, {"version": "3aa660c059240e0c795217182cf7df32909dd917", "lessThan": "c2ec33d46b4d1c8085dab5d02e00b21f4f0fb8a9", "status": "affected", "versionType": "git"}, {"version": "3aa660c059240e0c795217182cf7df32909dd917", "lessThan": "ddb7ea36ba7129c2ed107e2186591128618864e1", "status": "affected", "versionType": "git"}, {"version": "6.6.84", "lessThan": "6.6.87", "status": "affected", "versionType": "semver"}, {"version": "6.12.20", "lessThan": "6.12.23", "status": "affected", "versionType": "semver"}, {"version": "6.13.8", "lessThan": "6.13.11", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/oplock.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "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": "6.6.84", "versionEndExcluding": "6.6.87"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.20", "versionEndExcluding": "6.12.23"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13.8", "versionEndExcluding": "6.13.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.14.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8829849da3f68697b830a5b36047b0d8a50ae3ed"}, {"url": "https://git.kernel.org/stable/c/4790bcb269e5d6d88200a67c54ae6d627332a3be"}, {"url": "https://git.kernel.org/stable/c/457db486203c90e10c3efc87fd45cc7000b1cd36"}, {"url": "https://git.kernel.org/stable/c/20378cf48359f39dee0ef9b61470ebe77bd49c0d"}, {"url": "https://git.kernel.org/stable/c/c2ec33d46b4d1c8085dab5d02e00b21f4f0fb8a9"}, {"url": "https://git.kernel.org/stable/c/ddb7ea36ba7129c2ed107e2186591128618864e1"}], "title": "ksmbd: fix r_count dec/increment mismatch", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/server/oplock.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8829849da3f68697b830a5b36047b0d8a50ae3ed", "status": "affected", "version": "8e6508c7ecb1802909f294827eff38f301d0c937", "versionType": "git"}, {"lessThan": "4790bcb269e5d6d88200a67c54ae6d627332a3be", "status": "affected", "version": "09aeab68033161cb54f194da93e51a11aee6144b", "versionType": "git"}, {"lessThan": "457db486203c90e10c3efc87fd45cc7000b1cd36", "status": "affected", "version": "a4261bbc33fbf99b99c80aa3a2c5097611802980", "versionType": "git"}, {"lessThan": "20378cf48359f39dee0ef9b61470ebe77bd49c0d", "status": "affected", "version": "f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa", "versionType": "git"}, {"lessThan": "c2ec33d46b4d1c8085dab5d02e00b21f4f0fb8a9", "status": "affected", "version": "3aa660c059240e0c795217182cf7df32909dd917", "versionType": "git"}, {"lessThan": "ddb7ea36ba7129c2ed107e2186591128618864e1", "status": "affected", "version": "3aa660c059240e0c795217182cf7df32909dd917", "versionType": "git"}, {"lessThan": "6.6.87", "status": "affected", "version": "6.6.84", "versionType": "semver"}, {"lessThan": "6.12.23", "status": "affected", "version": "6.12.20", "versionType": "semver"}, {"lessThan": "6.13.11", "status": "affected", "version": "6.13.8", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/server/oplock.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "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": "C840BE22-A881-49E3-8387-B3C767385CFF", "versionEndExcluding": "6.6.87", "versionStartIncluding": "6.6.84", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E6266EAA-36A6-4293-8D0E-E9F7EA2E8341", "versionEndExcluding": "6.12.23", "versionStartIncluding": "6.12.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "23B69B03-DE8A-49CE-ADA3-2158636FDDED", "versionEndExcluding": "6.13.11", "versionStartIncluding": "6.13.8", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:-:*:*:*:*:*:*", "matchCriteriaId": "7DE421BA-0600-4401-A175-73CAB6A6FB4E", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc7:*:*:*:*:*:*", "matchCriteriaId": "AD948719-8628-4421-A340-1066314BBD4A", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14.1:*:*:*:*:*:*:*", "matchCriteriaId": "368D376F-50DC-452F-8D91-2586C7B344FB", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix r_count dec/increment mismatch\n\nr_count is only increased when there is an oplock break wait,\nso r_count inc/decrement are not paired. This can cause r_count\nto become negative, which can lead to a problem where the ksmbd\nthread does not terminate."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: se corrige la discrepancia entre r_count decrement y decrement. r_count solo aumenta cuando hay una espera de interrupci\u00f3n de oplock, por lo que r_count inc/decrement no se empareja. Esto puede provocar que r_count sea negativo, lo que puede provocar un problema donde el subproceso ksmbd no termina."}], "id": "CVE-2025-22074", "lastModified": "2026-10-30T13:17:56.687", "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": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-04-16T15:16:01.593", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/20378cf48359f39dee0ef9b61470ebe77bd49c0d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/457db486203c90e10c3efc87fd45cc7000b1cd36"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4790bcb269e5d6d88200a67c54ae6d627332a3be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8829849da3f68697b830a5b36047b0d8a50ae3ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c2ec33d46b4d1c8085dab5d02e00b21f4f0fb8a9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ddb7ea36ba7129c2ed107e2186591128618864e1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: fix r_count dec/increment mismatch", "id": "2360271", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2360271"}, "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 r_count dec/increment mismatch\nr_count is only increased when there is an oplock break wait,\nso r_count inc/decrement are not paired. This can cause r_count\nto become negative, which can lead to a problem where the ksmbd\nthread does not terminate."], "name": "CVE-2025-22074", "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-2025-22074\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-22074\nhttps://lore.kernel.org/linux-cve-announce/2025041611-CVE-2025-22074-2c8b@gregkh/T"], "threat_severity": "Low"}

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