CVE-2026-74522

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74522", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.911Z", "datePublished": "2026-08-15T12:27:39.945Z", "dateUpdated": "2026-08-19T16:38:25.036Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:38:25.036Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in __close_file_table_ids()\n\nA ksmbd_file can remain alive after logical close while another session\nholds a temporary reference obtained through ksmbd_lookup_fd_inode().\nksmbd_close_fd() currently marks the file closed and drops the idr-owned\nreference, but leaves the pointer published in the closing session's idr\nuntil the final reference is dropped.\n\nIf the foreign holder performs the final ksmbd_fd_put(), __put_fd_final()\nsupplies the foreign session's file table to __ksmbd_close_fd(). The object\nis then freed without being removed from its owner's idr, and the owner\nsession later dereferences the stale pointer during file-table teardown.\n\nRemove the volatile id from the owner's idr while ksmbd_close_fd() still\nholds that table's lock, and clear volatile_id before dropping\nthe idr-owned reference. A later foreign final put then only performs\nphysical destruction and cannot remove the object from the wrong table."}], "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 - The bug is in ksmbd, the in-kernel SMB server reached remotely over TCP port 445 via SMB2 CREATE/CLOSE/SET_INFO rename and session teardown requests.\nAC:L - An attacker controls both sides of the race by issuing concurrent SMB2 CLOSE and rename operations on the same share, then logoff or disconnect; no victim-dependent timing or memory layout is required.\nPR:L - Exploitation requires a valid authenticated SMB session and share access to open, close, and rename files; it is not reachable on pre-authentication negotiate/echo paths.\nUI:N - No end-user action is required beyond the attacker driving SMB protocol operations on their own client connection(s).\nS:U - Impact is confined to kernel memory corruption and privilege escalation on the SMB server host; it does not cross a VM, container, or IOMMU security boundary.\nC:H - Use-after-free of a freed ksmbd_file slab object during session file-table teardown enables reading attacker-influenced heap contents and building arbitrary kernel memory read primitives.\nI:H - The UAF corrupts kernel heap metadata and ksmbd_file fields (pointers, list heads), enabling heap grooming and arbitrary write or control-flow hijack for code execution as root.\nA:H - The stale IDR entry is dereferenced during __close_file_table_ids() on logoff, tree disconnect, or connection teardown, causing kernel oops/panic and repeatable remote denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/vfs_cache.c"], "versions": [{"version": "8510a043d334ecdf83d4604782f288db6bf21d60", "lessThan": "19bfd90d5aaf63217735d81964585c5306158e5f", "status": "affected", "versionType": "git"}, {"version": "8510a043d334ecdf83d4604782f288db6bf21d60", "lessThan": "67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd", "status": "affected", "versionType": "git"}, {"version": "8510a043d334ecdf83d4604782f288db6bf21d60", "lessThan": "0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac", "status": "affected", "versionType": "git"}, {"version": "8510a043d334ecdf83d4604782f288db6bf21d60", "lessThan": "9be4a66f019ea90bd9deca70511f4f9ffebf5c6f", "status": "affected", "versionType": "git"}, {"version": "8510a043d334ecdf83d4604782f288db6bf21d60", "lessThan": "cffbdc86393b0235383a20c8c59bc32f16036459", "status": "affected", "versionType": "git"}, {"version": "8510a043d334ecdf83d4604782f288db6bf21d60", "lessThan": "e7188199eff46a636f3436356f0aae039be6dd66", "status": "affected", "versionType": "git"}, {"version": "df30cbfd3d8a70e61ce59f63ce5ed2261799ac10", "status": "affected", "versionType": "git"}, {"version": "aaf1d5ebb358f546414965b39da90107a7ca7ce5", "status": "affected", "versionType": "git"}, {"version": "5.15.38", "lessThan": "5.16", "status": "affected", "versionType": "semver"}, {"version": "5.17.6", "lessThan": "5.18", "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/vfs_cache.c"], "versions": [{"version": "5.18", "status": "affected"}, {"version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.18", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.6.151"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.38"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17.6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/19bfd90d5aaf63217735d81964585c5306158e5f"}, {"url": "https://git.kernel.org/stable/c/67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd"}, {"url": "https://git.kernel.org/stable/c/0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac"}, {"url": "https://git.kernel.org/stable/c/9be4a66f019ea90bd9deca70511f4f9ffebf5c6f"}, {"url": "https://git.kernel.org/stable/c/cffbdc86393b0235383a20c8c59bc32f16036459"}, {"url": "https://git.kernel.org/stable/c/e7188199eff46a636f3436356f0aae039be6dd66"}], "title": "ksmbd: fix use-after-free in __close_file_table_ids()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/server/vfs_cache.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "19bfd90d5aaf63217735d81964585c5306158e5f", "status": "affected", "version": "8510a043d334ecdf83d4604782f288db6bf21d60", "versionType": "git"}, {"lessThan": "67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd", "status": "affected", "version": "8510a043d334ecdf83d4604782f288db6bf21d60", "versionType": "git"}, {"lessThan": "0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac", "status": "affected", "version": "8510a043d334ecdf83d4604782f288db6bf21d60", "versionType": "git"}, {"lessThan": "9be4a66f019ea90bd9deca70511f4f9ffebf5c6f", "status": "affected", "version": "8510a043d334ecdf83d4604782f288db6bf21d60", "versionType": "git"}, {"lessThan": "cffbdc86393b0235383a20c8c59bc32f16036459", "status": "affected", "version": "8510a043d334ecdf83d4604782f288db6bf21d60", "versionType": "git"}, {"lessThan": "e7188199eff46a636f3436356f0aae039be6dd66", "status": "affected", "version": "8510a043d334ecdf83d4604782f288db6bf21d60", "versionType": "git"}, {"status": "affected", "version": "df30cbfd3d8a70e61ce59f63ce5ed2261799ac10", "versionType": "git"}, {"status": "affected", "version": "aaf1d5ebb358f546414965b39da90107a7ca7ce5", "versionType": "git"}, {"lessThan": "5.16", "status": "affected", "version": "5.15.38", "versionType": "semver"}, {"lessThan": "5.18", "status": "affected", "version": "5.17.6", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/server/vfs_cache.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.18"}, {"lessThan": "5.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.151", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.103", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in __close_file_table_ids()\n\nA ksmbd_file can remain alive after logical close while another session\nholds a temporary reference obtained through ksmbd_lookup_fd_inode().\nksmbd_close_fd() currently marks the file closed and drops the idr-owned\nreference, but leaves the pointer published in the closing session's idr\nuntil the final reference is dropped.\n\nIf the foreign holder performs the final ksmbd_fd_put(), __put_fd_final()\nsupplies the foreign session's file table to __ksmbd_close_fd(). The object\nis then freed without being removed from its owner's idr, and the owner\nsession later dereferences the stale pointer during file-table teardown.\n\nRemove the volatile id from the owner's idr while ksmbd_close_fd() still\nholds that table's lock, and clear volatile_id before dropping\nthe idr-owned reference. A later foreign final put then only performs\nphysical destruction and cannot remove the object from the wrong table."}], "id": "CVE-2026-74522", "lastModified": "2026-08-19T17:21:08.877", "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"}]}, "published": "2026-08-15T13:17:57.433", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/19bfd90d5aaf63217735d81964585c5306158e5f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9be4a66f019ea90bd9deca70511f4f9ffebf5c6f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cffbdc86393b0235383a20c8c59bc32f16036459"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e7188199eff46a636f3436356f0aae039be6dd66"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ksmbd: fix use-after-free in __close_file_table_ids()", "id": "2517032", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517032"}, "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"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nksmbd: fix use-after-free in __close_file_table_ids()\nA ksmbd_file can remain alive after logical close while another session\nholds a temporary reference obtained through ksmbd_lookup_fd_inode().\nksmbd_close_fd() currently marks the file closed and drops the idr-owned\nreference, but leaves the pointer published in the closing session's idr\nuntil the final reference is dropped.\nIf the foreign holder performs the final ksmbd_fd_put(), __put_fd_final()\nsupplies the foreign session's file table to __ksmbd_close_fd(). The object\nis then freed without being removed from its owner's idr, and the owner\nsession later dereferences the stale pointer during file-table teardown.\nRemove the volatile id from the owner's idr while ksmbd_close_fd() still\nholds that table's lock, and clear volatile_id before dropping\nthe idr-owned reference. A later foreign final put then only performs\nphysical destruction and cannot remove the object from the wrong table.", "A flaw was found in ksmbd, a component of the Linux kernel. This use-after-free vulnerability occurs when a ksmbd file object is prematurely freed while another session still holds a reference to it. This can lead to the system attempting to access freed memory, potentially causing a system crash and resulting in a denial of service."], "name": "CVE-2026-74522", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74522\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74522\nhttps://lore.kernel.org/linux-cve-announce/2026081545-CVE-2026-74522-bc43@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8510a043d334ecdf83d4604782f288db6bf21d60,67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8510a043d334ecdf83d4604782f288db6bf21d60,0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8510a043d334ecdf83d4604782f288db6bf21d60,9be4a66f019ea90bd9deca70511f4f9ffebf5c6f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8510a043d334ecdf83d4604782f288db6bf21d60,cffbdc86393b0235383a20c8c59bc32f16036459)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8510a043d334ecdf83d4604782f288db6bf21d60,e7188199eff46a636f3436356f0aae039be6dd66)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "df30cbfd3d8a70e61ce59f63ce5ed2261799ac10"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "aaf1d5ebb358f546414965b39da90107a7ca7ce5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.38,5.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.17.6,5.18)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.151,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.103,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.44,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.8,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc6,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T16:15:03.531768+00:00", "updated": "2026-08-21T23:15:05.353946+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}