cve/published/2025/CVE-2025-21958.json

{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"openvswitch: switch to per-action label counting in conntrack\"\n\nCurrently, ovs_ct_set_labels() is only called for confirmed conntrack\nentries (ct) within ovs_ct_commit(). However, if the conntrack entry\ndoes not have the labels_ext extension, attempting to allocate it in\novs_ct_get_conn_labels() for a confirmed entry triggers a warning in\nnf_ct_ext_add():\n\n  WARN_ON(nf_ct_is_confirmed(ct));\n\nThis happens when the conntrack entry is created externally before OVS\nincrements net->ct.labels_used. The issue has become more likely since\ncommit fcb1aa5163b1 (\"openvswitch: switch to per-action label counting\nin conntrack\"), which changed to use per-action label counting and\nincrement net->ct.labels_used when a flow with ct action is added.\n\nSince there’s no straightforward way to fully resolve this issue at the\nmoment, this reverts the commit to avoid breaking existing use cases."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/openvswitch/conntrack.c",
                  "net/openvswitch/datapath.h"
               ],
               "versions": [
                  {
                     "version": "fcb1aa5163b1ae4cf2864b688b08927aac51f51e",
                     "lessThan": "9e79fdabd52cfce1a021640a81256878a2c516a2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fcb1aa5163b1ae4cf2864b688b08927aac51f51e",
                     "lessThan": "d91bfc64a4886102746e74d2c6f3a61e9a77fd7d",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fcb1aa5163b1ae4cf2864b688b08927aac51f51e",
                     "lessThan": "1063ae07383c0ddc5bcce170260c143825846b03",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/openvswitch/conntrack.c",
                  "net/openvswitch/datapath.h"
               ],
               "versions": [
                  {
                     "version": "6.12",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "6.12",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.12.20",
                     "lessThanOrEqual": "6.12.*",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.13.8",
                     "lessThanOrEqual": "6.13.*",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.14",
                     "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": "6.12",
                           "versionEndExcluding": "6.12.20"
                        },
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "6.12",
                           "versionEndExcluding": "6.13.8"
                        },
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "6.12",
                           "versionEndExcluding": "6.14"
                        }
                     ]
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         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/9e79fdabd52cfce1a021640a81256878a2c516a2"
            },
            {
               "url": "https://git.kernel.org/stable/c/d91bfc64a4886102746e74d2c6f3a61e9a77fd7d"
            },
            {
               "url": "https://git.kernel.org/stable/c/1063ae07383c0ddc5bcce170260c143825846b03"
            }
         ],
         "title": "Revert \"openvswitch: switch to per-action label counting in conntrack\"",
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         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2025-21958",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}