CVE-2026-43088 (GCVE-0-2026-43088)
Vulnerability from cvelistv5
Published
2026-05-06 07:40
Modified
2026-05-14 14:30
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: af_key: zero aligned sockaddr tail in PF_KEY exports PF_KEY export paths use `pfkey_sockaddr_size()` when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, `pfkey_sockaddr_fill()` initializes only the first 28 bytes of `struct sockaddr_in6`, leaving the final 4 aligned bytes uninitialized. Not every PF_KEY message is affected. The state and policy dump builders already zero the whole message buffer before filling the sockaddr payloads. Keep the fix to the export paths that still append aligned sockaddr payloads with plain `skb_put()`: - `SADB_ACQUIRE` - `SADB_X_NAT_T_NEW_MAPPING` - `SADB_X_MIGRATE` Fix those paths by clearing only the aligned sockaddr tail after `pfkey_sockaddr_fill()`.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/key/af_key.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "2.6.12"
            },
            {
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              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.12.88",
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              "version": "6.18.30",
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
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        }
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      "cpeApplicability": [
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          "nodes": [
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                }
              ],
              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: af_key: zero aligned sockaddr tail in PF_KEY exports\n\nPF_KEY export paths use `pfkey_sockaddr_size()` when reserving sockaddr\npayload space, so IPv6 addresses occupy 32 bytes on the wire. However,\n`pfkey_sockaddr_fill()` initializes only the first 28 bytes of\n`struct sockaddr_in6`, leaving the final 4 aligned bytes uninitialized.\n\nNot every PF_KEY message is affected. The state and policy dump builders\nalready zero the whole message buffer before filling the sockaddr\npayloads. Keep the fix to the export paths that still append aligned\nsockaddr payloads with plain `skb_put()`:\n\n  - `SADB_ACQUIRE`\n  - `SADB_X_NAT_T_NEW_MAPPING`\n  - `SADB_X_MIGRATE`\n\nFix those paths by clearing only the aligned sockaddr tail after\n`pfkey_sockaddr_fill()`."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-14T14:30:12.539Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/11cbf294bac623bd57296f231199193087f57b4a"
        },
        {
          "url": "https://git.kernel.org/stable/c/edd446ee7cd3d02cac246168063d5b3e9ea68460"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e74f974359b5382ecbe8536abbb5b837eb6c724"
        },
        {
          "url": "https://git.kernel.org/stable/c/426c355742f02cf743b347d9d7dbdc1bfbfa31ef"
        }
      ],
      "title": "net: af_key: zero aligned sockaddr tail in PF_KEY exports",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43088",
    "datePublished": "2026-05-06T07:40:21.962Z",
    "dateReserved": "2026-05-01T14:12:55.983Z",
    "dateUpdated": "2026-05-14T14:30:12.539Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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