{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53391", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.402Z", "datePublished": "2026-07-19T12:01:55.521Z", "dateUpdated": "2026-07-20T13:39:54.843Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-20T13:39:54.843Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr\n\nnfs4_decode_mp_ds_addr() decodes the r_netid and r_addr opaques of a\nnetaddr4 from a GETDEVICEINFO multipath-DS body, then immediately\ncalls strrchr(buf, '.') to locate the port separator. Both decodes\nuse xdr_stream_decode_string_dup(), and the current code checks only\n\"nlen < 0\" / \"rlen < 0\" before dereferencing the returned string.\n\nWhen the on-wire opaque has length zero, xdr_stream_decode_opaque_inline()\nreturns 0 and xdr_stream_decode_string_dup() falls through to its\n\"*str = NULL; return ret\" tail, leaving buf NULL with a return value\nof 0. The \"< 0\" check does not catch this, and the next line is\nstrrchr(NULL, '.'), a kernel NULL pointer dereference reachable from\nany pNFS-flexfile client mounted against a malicious or compromised\nmetadata server.\n\nReject the zero-length cases explicitly so the decoder fails with\n-EBADMSG (treated as a malformed GETDEVICEINFO body) instead of\npanicking the client."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfs/pnfs_nfs.c"], "versions": [{"version": "6b7f3cf96364eaf597940cb5c68a682894829915", "lessThan": "76b94cbd32aacf36a641956385a852635c6802b9", "status": "affected", "versionType": "git"}, {"version": "6b7f3cf96364eaf597940cb5c68a682894829915", "lessThan": "c8e4e0c701d0192a2efb6df059c0f9e19678c23d", "status": "affected", "versionType": "git"}, {"version": "6b7f3cf96364eaf597940cb5c68a682894829915", "lessThan": "6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea", "status": "affected", "versionType": "git"}, {"version": "6b7f3cf96364eaf597940cb5c68a682894829915", "lessThan": "427ab81a811dab4bca9d19f82eec5847ae42646e", "status": "affected", "versionType": "git"}, {"version": "6b7f3cf96364eaf597940cb5c68a682894829915", "lessThan": "012d37a568bfbb2c9686f03ade75560bc7139956", "status": "affected", "versionType": "git"}, {"version": "6b7f3cf96364eaf597940cb5c68a682894829915", "lessThan": "30aae62e50b4e074a90a9a5e15246548fbdc1182", "status": "affected", "versionType": "git"}, {"version": "6b7f3cf96364eaf597940cb5c68a682894829915", "lessThan": "41fe0f7b84f0cb822ae10ab08592996a592b2a25", "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/nfs/pnfs_nfs.c"], "versions": [{"version": "4.0", "status": "affected"}, {"version": "0", "lessThan": "4.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.211", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.177", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.144", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.95", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.38", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.3", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc1", "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": "4.0", "versionEndExcluding": "5.15.211"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.1.177"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.6.144"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.12.95"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.18.38"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "7.1.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "7.2-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/76b94cbd32aacf36a641956385a852635c6802b9"}, {"url": "https://git.kernel.org/stable/c/c8e4e0c701d0192a2efb6df059c0f9e19678c23d"}, {"url": "https://git.kernel.org/stable/c/6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea"}, {"url": "https://git.kernel.org/stable/c/427ab81a811dab4bca9d19f82eec5847ae42646e"}, {"url": "https://git.kernel.org/stable/c/012d37a568bfbb2c9686f03ade75560bc7139956"}, {"url": "https://git.kernel.org/stable/c/30aae62e50b4e074a90a9a5e15246548fbdc1182"}, {"url": "https://git.kernel.org/stable/c/41fe0f7b84f0cb822ae10ab08592996a592b2a25"}], "title": "NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr", "id": "2502260", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502260"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nNFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr\nnfs4_decode_mp_ds_addr() decodes the r_netid and r_addr opaques of a\nnetaddr4 from a GETDEVICEINFO multipath-DS body, then immediately\ncalls strrchr(buf, '.') to locate the port separator. Both decodes\nuse xdr_stream_decode_string_dup(), and the current code checks only\n\"nlen < 0\" / \"rlen < 0\" before dereferencing the returned string.\nWhen the on-wire opaque has length zero, xdr_stream_decode_opaque_inline()\nreturns 0 and xdr_stream_decode_string_dup() falls through to its\n\"*str = NULL; return ret\" tail, leaving buf NULL with a return value\nof 0. The \"< 0\" check does not catch this, and the next line is\nstrrchr(NULL, '.'), a kernel NULL pointer dereference reachable from\nany pNFS-flexfile client mounted against a malicious or compromised\nmetadata server.\nReject the zero-length cases explicitly so the decoder fails with\n-EBADMSG (treated as a malformed GETDEVICEINFO body) instead of\npanicking the client.", "A flaw was found in the Linux kernel's NFSv4/pNFS implementation. The `nfs4_decode_mp_ds_addr` function, responsible for decoding network address information, does not properly handle zero-length `r_addr` opaque data. A malicious or compromised metadata server can exploit this by providing a zero-length `r_addr`, leading to a NULL pointer dereference and causing the client system to panic, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-53391", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53391\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53391\nhttps://lore.kernel.org/linux-cve-announce/2026071956-CVE-2026-53391-d4df@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b7f3cf96364eaf597940cb5c68a682894829915,76b94cbd32aacf36a641956385a852635c6802b9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b7f3cf96364eaf597940cb5c68a682894829915,c8e4e0c701d0192a2efb6df059c0f9e19678c23d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b7f3cf96364eaf597940cb5c68a682894829915,6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b7f3cf96364eaf597940cb5c68a682894829915,427ab81a811dab4bca9d19f82eec5847ae42646e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b7f3cf96364eaf597940cb5c68a682894829915,012d37a568bfbb2c9686f03ade75560bc7139956)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b7f3cf96364eaf597940cb5c68a682894829915,30aae62e50b4e074a90a9a5e15246548fbdc1182)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6b7f3cf96364eaf597940cb5c68a682894829915,41fe0f7b84f0cb822ae10ab08592996a592b2a25)"}}], "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": "4.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.211,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.177,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.144,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.95,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.38,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.3,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "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": "2026-07-21T00:45:05.633009+00:00", "updated": "2026-07-21T00:45:05.633047+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}