Vulnerability-Lookup

FKIE_CVE-2026-31663

Vulnerability from fkie_nvd - Published: 2026-04-24 15:16 - Updated: 2026-04-27 19:59

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	4.15
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

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      "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."
    }
  ],
  "id": "CVE-2026-31663",
  "lastModified": "2026-04-27T19:59:32.810",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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  "vulnStatus": "Analyzed",
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          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-04-24 14:45 – Updated: 2026-05-23 16:05

Title

xfrm: hold dev ref until after transport_finish NF_HOOK

Summary

Severity

7.8 (High)


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

Assigner

Linux

References

3 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

2 products

Vendor	Product	Version
Linux	Linux	Affected: acf568ee859f098279eadf551612f103afdacb4e , < 0f451b43c88bf2b9c038b414be580efee42e031b (git) Affected: acf568ee859f098279eadf551612f103afdacb4e , < 5002beda5cac69d522dc54da0d5d463ed9c963d2 (git) Affected: acf568ee859f098279eadf551612f103afdacb4e , < 1c428b03840094410c5fb6a5db30640486bbbfcb (git) Affected: 69895c5ea0ca2e8d7de1e6d36965d0ab9730787f (git) Affected: 833760100588acfb267dac4d6a02ab9931237739 (git) Affected: e095ecaec6d94aa2156cceb98a85d409b51190f3 (git) Affected: 3.2.100 , < 3.3 (semver) Affected: 3.16.55 , < 3.17 (semver) Affected: 4.14.24 , < 4.15 (semver)
Linux	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

To clipboard

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          "programFiles": [
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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

FKIE_CVE-2026-31663

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

Tags

Sightings

Nomenclature