{"id":"CVE-2026-93231","state":"PUBLISHED","title":"lockd: fix swapped arguments in nlmsvc_match_ip()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nlockd: fix swapped arguments in nlmsvc_match_ip()\n\nWhen releasing locks by server IP address via /proc/fs/nfsd/unlock_ip,\nnlmsvc_unlock_all_by_ip() calls nlm_traverse_files() with the server\nsockaddr as the opaque @data argument:\n\n\tnlm_traverse_files(server_addr, nlmsvc_match_ip, NULL);\n\nThe match callback is later invoked from nlm_traverse_locks() as:\n\n\tmatch(lockhost, host);\n\nwhere the first argument is the nlm_host that owns the lock, and the\nsecond argument is the @data that was originally passed down (here the\nserver sockaddr).  This is the convention every other match callback\nrelies on (nlmsvc_mark_host(), nlmsvc_same_host(), nlmsvc_is_client()):\narg1 is the real nlm_host, arg2 is the caller-supplied reference value.\n\nnlmsvc_match_ip() has had these two arguments reversed ever since the\nunlock-by-IP feature was introduced in commit 4373ea84c84d (\"lockd:\nunlock lockd locks associated with a given server ip\"):\n\n\treturn rpc_cmp_addr(nlm_srcaddr(host), datap);\n\nHere @host is actually the server sockaddr, so nlm_srcaddr(host)\ndereferences a struct sockaddr as a struct nlm_host and reads garbage\nat the offset of h_srcaddr; meanwhile @datap is actually the lock\nowner's nlm_host but is compared as a sockaddr.  As a result the\ncomparison practically never matches and locks are not released for the\nrequested IP.\n\nSwap the arguments so the lock owner's source address is compared\nagainst the requested server address:\n\n\treturn rpc_cmp_addr(nlm_srcaddr(datap), (struct sockaddr *)host);\n\n[ cel: fix the misleading typedef parameter names too ]","publishedAt":"2026-09-24T15:29:19.786Z","updatedAt":"2026-10-30T12:36:28.057Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"e7124d223c5a2dfb4c1a7b2eea24375edc355a10","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"68282cbc197b280711f66c4cf05165f911785bcc","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"cfbf21d21aea1a83d5ff38d50466a655e0a6a31d","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"4fe2db296c9cd897dd1fe06cc0ae9cbc13beefc5","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"d34c2ac447fe0490ede828e0143e2cbcb59e6c77","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"0d72e78c9d38d5377a059a4837f82b65b91cdcf6","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"21bcb609e0ab1dd60f39ca3498f85808933bcc9f","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"b9060689f49dc663e9a3d069c4a65ff63a836e66","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/lockd/lockd.h","fs/lockd/svcsubs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.26","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.26","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/lockd/lockd.h","fs/lockd/svcsubs.c"]}],"references":["https://git.kernel.org/stable/c/e7124d223c5a2dfb4c1a7b2eea24375edc355a10","https://git.kernel.org/stable/c/68282cbc197b280711f66c4cf05165f911785bcc","https://git.kernel.org/stable/c/cfbf21d21aea1a83d5ff38d50466a655e0a6a31d","https://git.kernel.org/stable/c/4fe2db296c9cd897dd1fe06cc0ae9cbc13beefc5","https://git.kernel.org/stable/c/d34c2ac447fe0490ede828e0143e2cbcb59e6c77","https://git.kernel.org/stable/c/0d72e78c9d38d5377a059a4837f82b65b91cdcf6","https://git.kernel.org/stable/c/21bcb609e0ab1dd60f39ca3498f85808933bcc9f","https://git.kernel.org/stable/c/b9060689f49dc663e9a3d069c4a65ff63a836e66"],"weaknesses":[],"ingestedAt":"2026-10-30T12:56:04.490Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93231.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93231","state":"PUBLISHED","datePublished":"2026-09-24T15:29:19.786Z","dateUpdated":"2026-10-30T12:36:28.057Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T16:02:15.095Z"},"containers":{"cna":{"title":"lockd: fix swapped arguments in nlmsvc_match_ip()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nlockd: fix swapped arguments in nlmsvc_match_ip()\n\nWhen releasing locks by server IP address via /proc/fs/nfsd/unlock_ip,\nnlmsvc_unlock_all_by_ip() calls nlm_traverse_files() with the server\nsockaddr as the opaque @data argument:\n\n\tnlm_traverse_files(server_addr, nlmsvc_match_ip, NULL);\n\nThe match callback is later invoked from nlm_traverse_locks() as:\n\n\tmatch(lockhost, host);\n\nwhere the first argument is the nlm_host that owns the lock, and the\nsecond argument is the @data that was originally passed down (here the\nserver sockaddr).  This is the convention every other match callback\nrelies on (nlmsvc_mark_host(), nlmsvc_same_host(), nlmsvc_is_client()):\narg1 is the real nlm_host, arg2 is the caller-supplied reference value.\n\nnlmsvc_match_ip() has had these two arguments reversed ever since the\nunlock-by-IP feature was introduced in commit 4373ea84c84d (\"lockd:\nunlock lockd locks associated with a given server ip\"):\n\n\treturn rpc_cmp_addr(nlm_srcaddr(host), datap);\n\nHere @host is actually the server sockaddr, so nlm_srcaddr(host)\ndereferences a struct sockaddr as a struct nlm_host and reads garbage\nat the offset of h_srcaddr; meanwhile @datap is actually the lock\nowner's nlm_host but is compared as a sockaddr.  As a result the\ncomparison practically never matches and locks are not released for the\nrequested IP.\n\nSwap the arguments so the lock owner's source address is compared\nagainst the requested server address:\n\n\treturn rpc_cmp_addr(nlm_srcaddr(datap), (struct sockaddr *)host);\n\n[ cel: fix the misleading typedef parameter names too ]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"e7124d223c5a2dfb4c1a7b2eea24375edc355a10","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"68282cbc197b280711f66c4cf05165f911785bcc","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"cfbf21d21aea1a83d5ff38d50466a655e0a6a31d","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"4fe2db296c9cd897dd1fe06cc0ae9cbc13beefc5","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"d34c2ac447fe0490ede828e0143e2cbcb59e6c77","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"0d72e78c9d38d5377a059a4837f82b65b91cdcf6","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"21bcb609e0ab1dd60f39ca3498f85808933bcc9f","versionType":"git"},{"version":"4373ea84c84d8a96e99d3da99e813d3e36d1bd11","status":"affected","lessThan":"b9060689f49dc663e9a3d069c4a65ff63a836e66","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/lockd/lockd.h","fs/lockd/svcsubs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.26","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.26","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/lockd/lockd.h","fs/lockd/svcsubs.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e7124d223c5a2dfb4c1a7b2eea24375edc355a10"},{"url":"https://git.kernel.org/stable/c/68282cbc197b280711f66c4cf05165f911785bcc"},{"url":"https://git.kernel.org/stable/c/cfbf21d21aea1a83d5ff38d50466a655e0a6a31d"},{"url":"https://git.kernel.org/stable/c/4fe2db296c9cd897dd1fe06cc0ae9cbc13beefc5"},{"url":"https://git.kernel.org/stable/c/d34c2ac447fe0490ede828e0143e2cbcb59e6c77"},{"url":"https://git.kernel.org/stable/c/0d72e78c9d38d5377a059a4837f82b65b91cdcf6"},{"url":"https://git.kernel.org/stable/c/21bcb609e0ab1dd60f39ca3498f85808933bcc9f"},{"url":"https://git.kernel.org/stable/c/b9060689f49dc663e9a3d069c4a65ff63a836e66"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:36:28.057Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}