Vulnerability-Lookup

GHSA-V6VR-F94R-R434

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-11 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

xfrm: account XFRMA_IF_ID in aevent size calculation

xfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then build_aevent() appends attributes including XFRMA_IF_ID when x->if_id is set.

xfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states with if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err < 0) in xfrm_get_ae(), turning a malformed netlink interaction into a kernel panic.

Account XFRMA_IF_ID in the size calculation unconditionally and replace the BUG_ON with normal error unwinding.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43107"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-131"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T10:16:24Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: account XFRMA_IF_ID in aevent size calculation\n\nxfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then\nbuild_aevent() appends attributes including XFRMA_IF_ID when x-\u003eif_id is\nset.\n\nxfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states\nwith if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err \u003c 0)\nin xfrm_get_ae(), turning a malformed netlink interaction into a kernel\npanic.\n\nAccount XFRMA_IF_ID in the size calculation unconditionally and replace\nthe BUG_ON with normal error unwinding.",
  "id": "GHSA-v6vr-f94r-r434",
  "modified": "2026-05-11T18:31:36Z",
  "published": "2026-05-06T12:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43107"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c41283d94af943a05f7f2cc1a01f0c872f3cf43"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58e5735d1a5373652f405a0c16e54ac04aaab0ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7081d46d32312f1a31f0e0e99c6835a394037599"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e62e322ea20be78e346e4b49f9a6b9f03313af4c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-43107 (GCVE-0-2026-43107)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-11 22:17

Title

xfrm: account XFRMA_IF_ID in aevent size calculation

Summary

In the Linux kernel, the following vulnerability has been resolved: xfrm: account XFRMA_IF_ID in aevent size calculation xfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then build_aevent() appends attributes including XFRMA_IF_ID when x->if_id is set. xfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states with if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err < 0) in xfrm_get_ae(), turning a malformed netlink interaction into a kernel panic. Account XFRMA_IF_ID in the size calculation unconditionally and replace the BUG_ON with normal error unwinding.

Severity ?

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/2c41283d94af943a0…
https://git.kernel.org/stable/c/e62e322ea20be78e3…
https://git.kernel.org/stable/c/58e5735d1a5373652…
https://git.kernel.org/stable/c/7081d46d32312f1a3…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7e6526404adedf079279aa7aa11722deaca8fe2e , < 2c41283d94af943a05f7f2cc1a01f0c872f3cf43 (git) Affected: 7e6526404adedf079279aa7aa11722deaca8fe2e , < e62e322ea20be78e346e4b49f9a6b9f03313af4c (git) Affected: 7e6526404adedf079279aa7aa11722deaca8fe2e , < 58e5735d1a5373652f405a0c16e54ac04aaab0ad (git) Affected: 7e6526404adedf079279aa7aa11722deaca8fe2e , < 7081d46d32312f1a31f0e0e99c6835a394037599 (git)
Linux	Linux	Affected: 4.19 Unaffected: 0 , < 4.19 (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_user.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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              "versionType": "git"
            },
            {
              "lessThan": "e62e322ea20be78e346e4b49f9a6b9f03313af4c",
              "status": "affected",
              "version": "7e6526404adedf079279aa7aa11722deaca8fe2e",
              "versionType": "git"
            },
            {
              "lessThan": "58e5735d1a5373652f405a0c16e54ac04aaab0ad",
              "status": "affected",
              "version": "7e6526404adedf079279aa7aa11722deaca8fe2e",
              "versionType": "git"
            },
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              "versionType": "git"
            }
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          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.83",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: account XFRMA_IF_ID in aevent size calculation\n\nxfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then\nbuild_aevent() appends attributes including XFRMA_IF_ID when x-\u003eif_id is\nset.\n\nxfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states\nwith if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err \u003c 0)\nin xfrm_get_ae(), turning a malformed netlink interaction into a kernel\npanic.\n\nAccount XFRMA_IF_ID in the size calculation unconditionally and replace\nthe BUG_ON with normal error unwinding."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:17:52.325Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/7081d46d32312f1a31f0e0e99c6835a394037599"
        }
      ],
      "title": "xfrm: account XFRMA_IF_ID in aevent size calculation",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43107",
    "datePublished": "2026-05-06T07:40:35.068Z",
    "dateReserved": "2026-05-01T14:12:55.986Z",
    "dateUpdated": "2026-05-11T22:17:52.325Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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

GHSA-V6VR-F94R-R434

CVE-2026-43107 (GCVE-0-2026-43107)

Tags

Sightings

Nomenclature