cve/published/2025/CVE-2025-21768.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\nnet: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels\n\nSome lwtunnels have a dst cache for post-transformation dst.\nIf the packet destination did not change we may end up recording\na reference to the lwtunnel in its own cache, and the lwtunnel\nstate will never be freed.\n\nDiscovered by the ioam6.sh test, kmemleak was recently fixed\nto catch per-cpu memory leaks. I'm not sure if rpl and seg6\ncan actually hit this, but in principle I don't see why not."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/ipv6/ioam6_iptunnel.c",
                  "net/ipv6/rpl_iptunnel.c",
                  "net/ipv6/seg6_iptunnel.c"
               ],
               "versions": [
                  {
                     "version": "6c8702c60b88651072460f3f4026c7dfe2521d12",
                     "lessThan": "5ab11a4e219e93b8b31a27f8ec98d42afadd8b7a",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "6c8702c60b88651072460f3f4026c7dfe2521d12",
                     "lessThan": "4c0f200c7d06fedddde82209c099014d63f4a6c0",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "6c8702c60b88651072460f3f4026c7dfe2521d12",
                     "lessThan": "92191dd1073088753821b862b791dcc83e558e07",
                     "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/ipv6/ioam6_iptunnel.c",
                  "net/ipv6/rpl_iptunnel.c",
                  "net/ipv6/seg6_iptunnel.c"
               ],
               "versions": [
                  {
                     "version": "4.10",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "4.10",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.12.16",
                     "lessThanOrEqual": "6.12.*",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.13.4",
                     "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": "4.10",
                           "versionEndExcluding": "6.12.16"
                        },
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "4.10",
                           "versionEndExcluding": "6.13.4"
                        },
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "4.10",
                           "versionEndExcluding": "6.14"
                        }
                     ]
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/5ab11a4e219e93b8b31a27f8ec98d42afadd8b7a"
            },
            {
               "url": "https://git.kernel.org/stable/c/4c0f200c7d06fedddde82209c099014d63f4a6c0"
            },
            {
               "url": "https://git.kernel.org/stable/c/92191dd1073088753821b862b791dcc83e558e07"
            }
         ],
         "title": "net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels",
         "x_generator": {
            "engine": "bippy-1.2.0"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2025-21768",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}