Skip to content
Heist/ feed
Unrated

lockd: fix swapped arguments in nlmsvc_match_ip()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: lockd: fix swapped arguments in nlmsvc_match_ip() When releasing locks by server IP address via /proc/fs/nfsd/unlock_ip, nlmsvc_unlock_all_by_ip() calls nlm_traverse_files() with the server sockaddr as the opaque @data argument: nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL); The match callback is later invoked from nlm_traverse_locks() as: match(lockhost, host); where the first argument is the nlm_host that owns the lock, and the second argument is the @data that was originally passed down (here the server sockaddr). This is the convention every other match callback relies on (nlmsvc_mark_host(), nlmsvc_same_host(), nlmsvc_is_client()): arg1 is the real nlm_host, arg2 is the caller-supplied reference value. nlmsvc_match_ip() has had these two arguments reversed ever since the unlock-by-IP feature was introduced in commit 4373ea84c84d ("lockd: unlock lockd locks associated with a given server ip"): return rpc_cmp_addr(nlm_srcaddr(host), datap); Here @host is actually the server sockaddr, so nlm_srcaddr(host) dereferences a struct sockaddr as a struct nlm_host and reads garbage at the offset of h_srcaddr; meanwhile @datap is actually the lock owner's nlm_host but is compared as a sockaddr. As a result the comparison practically never matches and locks are not released for the requested IP. Swap the arguments so the lock owner's source address is compared against the requested server address: return rpc

Announced Source revision 1
Original source ↗

CVE-2026-93231

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-93231

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4373ea84c84d8a96e99d3da99e813d3e36d1bd11",
        "lessThan": "4fe2db296c9cd897dd1fe06cc0ae9cbc13beefc5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4373ea84c84d8a96e99d3da99e813d3e36d1bd11",
        "lessThan": "d34c2ac447fe0490ede828e0143e2cbcb59e6c77",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4373ea84c84d8a96e99d3da99e813d3e36d1bd11",
        "lessThan": "0d72e78c9d38d5377a059a4837f82b65b91cdcf6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4373ea84c84d8a96e99d3da99e813d3e36d1bd11",
        "lessThan": "21bcb609e0ab1dd60f39ca3498f85808933bcc9f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4373ea84c84d8a96e99d3da99e813d3e36d1bd11",
        "lessThan": "b9060689f49dc663e9a3d069c4a65ff63a836e66",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/lockd/lockd.h",
      "fs/lockd/svcsubs.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.26"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.26",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/lockd/lockd.h",
      "fs/lockd/svcsubs.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93231

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#48739 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement