CVE-2022-49280

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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"}}]}}

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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 - 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nfssvc_decode_writeargs() advierte: no hay l\u00edmite inferior en 'args->len' Cambie el tipo a sin signo para evitar este problema."}], "id": "CVE-2022-49280", "lastModified": "2026-08-04T10:17:42.770", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-49280", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T19:45:22.983376Z", "version": "2.0.3"}}]}, "published": "2025-02-26T07:01:04.840", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/184416d4b98509fb4c3d8fc3d6dc1437896cc159"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2764af8ce0bf03cc43ee4a11897cab96bde6caae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/413d8fefafe531a9442bb623e3fe292a38f88d65"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/614a61e1592051cc42d3c38f899c9f7bdaad8a1d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-191"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-191"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: NFSD: prevent underflow in nfssvc_decode_writeargs()", "id": "2347723", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347723"}, "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-191", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nNFSD: prevent underflow in nfssvc_decode_writeargs()\nSmatch complains:\nfs/nfsd/nfsxdr.c:341 nfssvc_decode_writeargs()\nwarn: no lower bound on 'args->len'\nChange the type to unsigned to prevent this issue."], "name": "CVE-2022-49280", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "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": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49280\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49280\nhttps://lore.kernel.org/linux-cve-announce/2025022631-CVE-2022-49280-8de2@gregkh/T"], "threat_severity": "Moderate"}

{}