{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49280", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T01:49:39.298Z", "datePublished": "2025-02-26T01:56:22.662Z", "dateUpdated": "2026-08-05T08:54:34.949Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:54:34.949Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: prevent underflow in nfssvc_decode_writeargs()\n\nSmatch complains:\n\n\tfs/nfsd/nfsxdr.c:341 nfssvc_decode_writeargs()\n\twarn: no lower bound on 'args->len'\n\nChange the type to unsigned to prevent this issue." } ], "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 bug is in NFSD's NFSv2 WRITE XDR decoder (nfssvc_decode_writeargs), reached when nfsd processes RPC calls over the network (TCP/UDP 2049); a remote NFS client triggers it by sending a crafted WRITE with an oversized length field.\nAC:L - The attacker fully controls the WRITE opaque-length field and can reliably choose values such as 0xFFFFFFFF/0xFFFFFFFE/0xFFFFFFFD so the signed max-size check is bypassed and xdr_align_size() wraps to 0, with no conditions outside attacker control.\nPR:N - Typical nfsd deployments accept AUTH_NULL/AUTH_SYS with IP-based exports, so a remote peer that can reach the service needs no real credentials; the vulnerable decode runs after RPC auth flavor acceptance and before filehandle/export write authorization.\nUI:N - Exploitation requires only attacker-sent NFSv2 WRITE RPCs; no victim user or administrator action on the server is needed.\nS:U - Impact stays within the host kernel/nfsd security authority and does not cross a VM, IOMMU, or other separate boundary.\nC:H - On affected kernels the bypass lets decode succeed with a negative len that becomes ULONG_MAX in nfsd_proc_write, so svc_fill_write_vector walks off rq_arg.pages and reads out-of-bounds kernel memory, enabling disclosure via this memory-safety violation.\nI:H - The same ULONG_MAX length causes svc_fill_write_vector to write past rq_vec[RPCSVC_MAXPAGES], yielding an out-of-bounds kernel write that can be leveraged for integrity compromise and control-flow hijacking.\nA:H - Out-of-bounds page/vector walks reliably 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/nfsproc.c", "fs/nfsd/xdr.h" ], "versions": [ { "version": "a51b5b737a0be93fae6ea2a18df03ab2359a3f4b", "lessThan": "614a61e1592051cc42d3c38f899c9f7bdaad8a1d", "status": "affected", "versionType": "git" }, { "version": "a51b5b737a0be93fae6ea2a18df03ab2359a3f4b", "lessThan": "2764af8ce0bf03cc43ee4a11897cab96bde6caae", "status": "affected", "versionType": "git" }, { "version": "a51b5b737a0be93fae6ea2a18df03ab2359a3f4b", "lessThan": "413d8fefafe531a9442bb623e3fe292a38f88d65", "status": "affected", "versionType": "git" }, { "version": "a51b5b737a0be93fae6ea2a18df03ab2359a3f4b", "lessThan": "184416d4b98509fb4c3d8fc3d6dc1437896cc159", "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/nfsproc.c", "fs/nfsd/xdr.h" ], "versions": [ { "version": "5.12", "status": "affected" }, { "version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.33", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16.19", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.2", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18", "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": "5.12", "versionEndExcluding": "5.15.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "5.16.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "5.17.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "5.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/614a61e1592051cc42d3c38f899c9f7bdaad8a1d" }, { "url": "https://git.kernel.org/stable/c/2764af8ce0bf03cc43ee4a11897cab96bde6caae" }, { "url": "https://git.kernel.org/stable/c/413d8fefafe531a9442bb623e3fe292a38f88d65" }, { "url": "https://git.kernel.org/stable/c/184416d4b98509fb4c3d8fc3d6dc1437896cc159" } ], "title": "NFSD: prevent underflow in nfssvc_decode_writeargs()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-49280", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2025-10-01T19:45:22.983376Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-191", "description": "CWE-191 Integer Underflow (Wrap or Wraparound)" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T19:47:00.943Z" } } ] } }