Vulnerability-Lookup

GHSA-V4M9-VRGR-8XM2

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-04-24 15:32

Details

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

xfrm: hold dev ref until after transport_finish NF_HOOK

After async crypto completes, xfrm_input_resume() calls dev_put() immediately on re-entry before the skb reaches transport_finish. The skb->dev pointer is then used inside NF_HOOK and its okfn, which can race with device teardown.

Remove the dev_put from the async resumption entry and instead drop the reference after the NF_HOOK call in transport_finish, using a saved device pointer since NF_HOOK may consume the skb. This covers NF_DROP, NF_QUEUE and NF_STOLEN paths that skip the okfn.

For non-transport exits (decaps, gro, drop) and secondary async return points, release the reference inline when async is set.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31663"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:45Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: hold dev ref until after transport_finish NF_HOOK\n\nAfter async crypto completes, xfrm_input_resume() calls dev_put()\nimmediately on re-entry before the skb reaches transport_finish.\nThe skb-\u003edev pointer is then used inside NF_HOOK and its okfn,\nwhich can race with device teardown.\n\nRemove the dev_put from the async resumption entry and instead\ndrop the reference after the NF_HOOK call in transport_finish,\nusing a saved device pointer since NF_HOOK may consume the skb.\nThis covers NF_DROP, NF_QUEUE and NF_STOLEN paths that skip\nthe okfn.\n\nFor non-transport exits (decaps, gro, drop) and secondary\nasync return points, release the reference inline when\nasync is set.",
  "id": "GHSA-v4m9-vrgr-8xm2",
  "modified": "2026-04-24T15:32:37Z",
  "published": "2026-04-24T15:32:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31663"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-31663 (GCVE-0-2026-31663)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:45 – Updated: 2026-04-24 14:45

Title

xfrm: hold dev ref until after transport_finish NF_HOOK

Summary

In the Linux kernel, the following vulnerability has been resolved: xfrm: hold dev ref until after transport_finish NF_HOOK After async crypto completes, xfrm_input_resume() calls dev_put() immediately on re-entry before the skb reaches transport_finish. The skb->dev pointer is then used inside NF_HOOK and its okfn, which can race with device teardown. Remove the dev_put from the async resumption entry and instead drop the reference after the NF_HOOK call in transport_finish, using a saved device pointer since NF_HOOK may consume the skb. This covers NF_DROP, NF_QUEUE and NF_STOLEN paths that skip the okfn. For non-transport exits (decaps, gro, drop) and secondary async return points, release the reference inline when async is set.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/0f451b43c88bf2b9c…
	https://git.kernel.org/stable/c/5002beda5cac69d52…
	https://git.kernel.org/stable/c/1c428b03840094410…

Impacted products

Vendor

Product

Version

Linux

Affected: acf568ee859f098279eadf551612f103afdacb4e , < 0f451b43c88bf2b9c038b414be580efee42e031b (git)
Affected: acf568ee859f098279eadf551612f103afdacb4e , < 5002beda5cac69d522dc54da0d5d463ed9c963d2 (git)
Affected: acf568ee859f098279eadf551612f103afdacb4e , < 1c428b03840094410c5fb6a5db30640486bbbfcb (git)
Affected: 69895c5ea0ca2e8d7de1e6d36965d0ab9730787f (git)
Affected: 833760100588acfb267dac4d6a02ab9931237739 (git)
Affected: e095ecaec6d94aa2156cceb98a85d409b51190f3 (git)

Linux

Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 6.18.23 , ≤ 6.18.* (semver)
Unaffected: 6.19.13 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/xfrm4_input.c",
            "net/ipv6/xfrm6_input.c",
            "net/xfrm/xfrm_input.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0f451b43c88bf2b9c038b414be580efee42e031b",
              "status": "affected",
              "version": "acf568ee859f098279eadf551612f103afdacb4e",
              "versionType": "git"
            },
            {
              "lessThan": "5002beda5cac69d522dc54da0d5d463ed9c963d2",
              "status": "affected",
              "version": "acf568ee859f098279eadf551612f103afdacb4e",
              "versionType": "git"
            },
            {
              "lessThan": "1c428b03840094410c5fb6a5db30640486bbbfcb",
              "status": "affected",
              "version": "acf568ee859f098279eadf551612f103afdacb4e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "69895c5ea0ca2e8d7de1e6d36965d0ab9730787f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "833760100588acfb267dac4d6a02ab9931237739",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e095ecaec6d94aa2156cceb98a85d409b51190f3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/xfrm4_input.c",
            "net/ipv6/xfrm6_input.c",
            "net/xfrm/xfrm_input.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.23",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.23",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.13",
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                },
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                  "versionStartIncluding": "4.15",
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                {
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              ],
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              "operator": "OR"
            }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: hold dev ref until after transport_finish NF_HOOK\n\nAfter async crypto completes, xfrm_input_resume() calls dev_put()\nimmediately on re-entry before the skb reaches transport_finish.\nThe skb-\u003edev pointer is then used inside NF_HOOK and its okfn,\nwhich can race with device teardown.\n\nRemove the dev_put from the async resumption entry and instead\ndrop the reference after the NF_HOOK call in transport_finish,\nusing a saved device pointer since NF_HOOK may consume the skb.\nThis covers NF_DROP, NF_QUEUE and NF_STOLEN paths that skip\nthe okfn.\n\nFor non-transport exits (decaps, gro, drop) and secondary\nasync return points, release the reference inline when\nasync is set."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T14:45:13.239Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb"
        }
      ],
      "title": "xfrm: hold dev ref until after transport_finish NF_HOOK",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31663",
    "datePublished": "2026-04-24T14:45:13.239Z",
    "dateReserved": "2026-03-09T15:48:24.129Z",
    "dateUpdated": "2026-04-24T14:45:13.239Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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-V4M9-VRGR-8XM2

CVE-2026-31663 (GCVE-0-2026-31663)

Tags

Sightings

Nomenclature