Vulnerability-Lookup

CVE-2026-43088 (GCVE-0-2026-43088)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-06 07:40

Title

net: af_key: zero aligned sockaddr tail in PF_KEY exports

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()`.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/2e74f974359b5382e…
	https://git.kernel.org/stable/c/426c355742f02cf74…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2e74f974359b5382ecbe8536abbb5b837eb6c724 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 426c355742f02cf743b347d9d7dbdc1bfbfa31ef (git)

Linux

Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/key/af_key.c"
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          "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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              "versionType": "git"
            },
            {
              "lessThan": "426c355742f02cf743b347d9d7dbdc1bfbfa31ef",
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              "versionType": "git"
            }
          ]
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/key/af_key.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
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          "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": "2026-05-06T07:40:21.962Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "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": "2026-05-06T07:40:21.962Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43088",
      "date": "2026-05-09",
      "epss": "0.00018",
      "percentile": "0.05073"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43088\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T10:16:22.090\",\"lastModified\":\"2026-05-06T13:08:07.970\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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()`.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2e74f974359b5382ecbe8536abbb5b837eb6c724\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/426c355742f02cf743b347d9d7dbdc1bfbfa31ef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

MSRC_CVE-2026-43088

Vulnerability from csaf_microsoft - Published: 2026-05-02 00:00 - Updated: 2026-05-07 01:08

Summary

net: af_key: zero aligned sockaddr tail in PF_KEY exports

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-43088

None Available There is no fix available for this vulnerability as of now

References

URL

Category

	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
	https://support.microsoft.com/lifecycle	external
	https://www.first.org/cvss	external
	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-43088 net: af_key: zero aligned sockaddr tail in PF_KEY exports - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-43088.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "net: af_key: zero aligned sockaddr tail in PF_KEY exports",
    "tracking": {
      "current_release_date": "2026-05-07T01:08:44.000Z",
      "generator": {
        "date": "2026-05-07T07:30:15.524Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-43088",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-07T01:08:44.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.137.1-2.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.137.1-2.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.137.1-2.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-43088",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-43088 net: af_key: zero aligned sockaddr tail in PF_KEY exports - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-43088.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-05-07T01:08:44.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "net: af_key: zero aligned sockaddr tail in PF_KEY exports"
    }
  ]
}

GHSA-5858-6G3V-6HMR

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-06 12:30

Details

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().

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-43088"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T10:16:22Z",
    "severity": null
  },
  "details": "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()`.",
  "id": "GHSA-5858-6g3v-6hmr",
  "modified": "2026-05-06T12:30:27Z",
  "published": "2026-05-06T12:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43088"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e74f974359b5382ecbe8536abbb5b837eb6c724"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/426c355742f02cf743b347d9d7dbdc1bfbfa31ef"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

FKIE_CVE-2026-43088

Vulnerability from fkie_nvd - Published: 2026-05-06 10:16 - Updated: 2026-05-06 13:08

Severity ?

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2e74f974359b5382ecbe8536abbb5b837eb6c724
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/426c355742f02cf743b347d9d7dbdc1bfbfa31ef

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "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()`."
    }
  ],
  "id": "CVE-2026-43088",
  "lastModified": "2026-05-06T13:08:07.970",
  "metrics": {},
  "published": "2026-05-06T10:16:22.090",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2e74f974359b5382ecbe8536abbb5b837eb6c724"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/426c355742f02cf743b347d9d7dbdc1bfbfa31ef"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-43088 (GCVE-0-2026-43088)

MSRC_CVE-2026-43088

GHSA-5858-6G3V-6HMR

FKIE_CVE-2026-43088

Tags

Sightings

Nomenclature