{"id":"CVE-2026-53391","revision":"4f926bde358f4a6092f07c374f971cd4","records":[{"revision":"4f926bde358f4a6092f07c374f971cd4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53391","aliases":[],"title":"NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr","description":"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.","state":0,"publishedAt":"2026-07-19T12:01:55.521+00:00","modifiedAt":"2026-10-19T20:07:45.936+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/nfs/pnfs_nfs.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6b7f3cf96364eaf597940cb5c68a682894829915\",\n                            \"lessThan\": \"76b94cbd32aacf36a641956385a852635c6802b9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6b7f3cf96364eaf597940cb5c68a682894829915\",\n                            \"lessThan\": \"c8e4e0c701d0192a2efb6df059c0f9e19678c23d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6b7f3cf96364eaf597940cb5c68a682894829915\",\n                            \"lessThan\": \"6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6b7f3cf96364eaf597940cb5c68a682894829915\",\n                            \"lessThan\": \"427ab81a811dab4bca9d19f82eec5847ae42646e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6b7f3cf96364eaf597940cb5c68a682894829915\",\n                            \"lessThan\": \"012d37a568bfbb2c9686f03ade75560bc7139956\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6b7f3cf96364eaf597940cb5c68a682894829915\",\n                            \"lessThan\": \"30aae62e50b4e074a90a9a5e15246548fbdc1182\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6b7f3cf96364eaf597940cb5c68a682894829915\",\n                            \"lessThan\": \"41fe0f7b84f0cb822ae10ab08592996a592b2a25\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/nfs/pnfs_nfs.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.211\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.177\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.144\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.95\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.38\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.3\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/76b94cbd32aacf36a641956385a852635c6802b9","https://git.kernel.org/stable/c/c8e4e0c701d0192a2efb6df059c0f9e19678c23d","https://git.kernel.org/stable/c/6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea","https://git.kernel.org/stable/c/427ab81a811dab4bca9d19f82eec5847ae42646e","https://git.kernel.org/stable/c/012d37a568bfbb2c9686f03ade75560bc7139956","https://git.kernel.org/stable/c/30aae62e50b4e074a90a9a5e15246548fbdc1182","https://git.kernel.org/stable/c/41fe0f7b84f0cb822ae10ab08592996a592b2a25"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53391","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53391","identifiers":["CVE-2026-53391"]},"retained":false,"historicalAffected":[]}],"coverage":[]}