{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4373ea84c84d8a96e99d3da99e813d3e36d1bd11"
            },
            {
              "fixed": "0d72e78c9d38d5377a059a4837f82b65b91cdcf6"
            },
            {
              "fixed": "21bcb609e0ab1dd60f39ca3498f85808933bcc9f"
            },
            {
              "fixed": "b9060689f49dc663e9a3d069c4a65ff63a836e66"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.26"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93231.json"
  },
  "details": "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 ]",
  "id": "CVE-2026-93231",
  "modified": "2026-09-26T03:30:19.118592659Z",
  "published": "2026-09-24T15:29:19.786Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d72e78c9d38d5377a059a4837f82b65b91cdcf6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21bcb609e0ab1dd60f39ca3498f85808933bcc9f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9060689f49dc663e9a3d069c4a65ff63a836e66"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93231.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93231"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "lockd: fix swapped arguments in nlmsvc_match_ip()"
}