{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49362", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.547Z", "datePublished": "2025-02-26T02:11:09.344Z", "dateUpdated": "2026-08-05T08:54:54.470Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:54:54.470Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Fix potential use-after-free in nfsd_file_put()\n\nnfsd_file_put_noref() can free @nf, so don't dereference @nf\nimmediately upon return from nfsd_file_put_noref()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable nfsd_file_put() path runs in the in-kernel NFS server (fs/nfsd/filecache.c) on READ/WRITE/COMMIT and related ops, reached via RPC to nfsd over the network (TCP/UDP 2049); no local access is required.\nAC:L - The UAF is a race between nfsd_file_put() observing NFSD_FILE_HASHED and a concurrent unhash (e.g. REMOVE → fsnotify → nfsd_file_close_inode) that drops the hash ref so put_noref frees @nf; a remote client controls both sides via concurrent NFS requests on multiple nfsd threads.\nPR:N - Typical nfsd deployments allow AUTH_SYS/AUTH_NULL with IP-based exports, so a remote peer that can reach the export self-asserts credentials with no cryptographic authentication and can exercise the filecache put path.\nUI:N - Exploitation requires only attacker-sent NFS protocol operations; no action by a victim user or administrator on the server is needed.\nS:U - The use-after-free corrupts kernel memory within the host nfsd authority and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - This is a use-after-free of a slab-allocated nfsd_file object; UAF enables reuse/spray of the freed object and can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same nfsd_file use-after-free enables heap spraying and corruption of the reallocated object, yielding write/control-flow hijack primitives in the NFS server kernel.\nA:H - Use-after-free of nfsd_file can cause kernel oops/panic or memory corruption crashes in nfsd threads, fully disrupting availability of the NFS server host." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfsd/filecache.c" ], "versions": [ { "version": "9862064ca81f9b9da8ebe26c86cf2b10c293ba1a", "lessThan": "ada1757b259f353cade47037ee0a0249b4cddad3", "status": "affected", "versionType": "git" }, { "version": "a98e5b3d958ac697aafb3d077eb2cca4a731b7ee", "lessThan": "261eabe19cb28e4a8587a4442d257b543d7c2d57", "status": "affected", "versionType": "git" }, { "version": "999397926ab3f78c7d1235cc4ca6e3c89d2769bf", "lessThan": "333dcc94ebf53f79f3dc0e7a7c16700bc7ff7e57", "status": "affected", "versionType": "git" }, { "version": "999397926ab3f78c7d1235cc4ca6e3c89d2769bf", "lessThan": "b6c71c66b0ad8f2b59d9bc08c7a5079b110bec01", "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/nfsd/filecache.c" ], "versions": [ { "version": "5.18", "status": "affected" }, { "version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.4", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "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": "5.18.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "5.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ada1757b259f353cade47037ee0a0249b4cddad3" }, { "url": "https://git.kernel.org/stable/c/261eabe19cb28e4a8587a4442d257b543d7c2d57" }, { "url": "https://git.kernel.org/stable/c/333dcc94ebf53f79f3dc0e7a7c16700bc7ff7e57" }, { "url": "https://git.kernel.org/stable/c/b6c71c66b0ad8f2b59d9bc08c7a5079b110bec01" } ], "title": "NFSD: Fix potential use-after-free in nfsd_file_put()", "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-2022-49362", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-27T18:16:34.174132Z" } } } ], "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": "2025-02-27T18:22:33.669Z" } } ] } }