CVE-2022-49362

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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 \u2192 fsnotify \u2192 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"}}]}}

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{"affected_release": [{"advisory": "RHSA-2023:2458", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-284.11.1.el9_2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-05-09T00:00:00Z"}, {"advisory": "RHSA-2023:2458", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-284.11.1.el9_2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-05-09T00:00:00Z"}], "bugzilla": {"description": "kernel: NFSD: Fix potential use-after-free in nfsd_file_put()", "id": "2347808", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347808"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nNFSD: Fix potential use-after-free in nfsd_file_put()\nnfsd_file_put_noref() can free @nf, so don't dereference @nf\nimmediately upon return from nfsd_file_put_noref()."], "name": "CVE-2022-49362", "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-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49362\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49362\nhttps://lore.kernel.org/linux-cve-announce/2025022644-CVE-2022-49362-3299@gregkh/T"], "threat_severity": "Important"}

{}