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

Vulnerability from cvelistv5 – Published: 2026-04-24 14:45 – Updated: 2026-09-15 12:04
VLAI
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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-826 - Premature Release of Resource During Expected Lifetime
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: acf568ee859f098279eadf551612f103afdacb4e , < 4236c30b437b80f673b9e08c8fae38b8d471ac9e (git)
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)
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Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.23 , ≤ 6.18.* (semver)
Unaffected: 6.19.13 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-15T11:38:57+00:00",
      "cve": "CVE-2026-31663",
      "id": "CVE-2026-31663",
      "initial_release_date": "2026-04-24T00:00:00+00:00",
      "product_status:fixed": "309",
      "product_status:known_affected": "182",
      "product_status:known_not_affected": "16",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfrm: hold dev ref until after transport_finish NF_HOOK",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31663.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.