xfrm: hold dev ref until after transport_finish NF_HOOK

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Summary

CVECVE-2026-31663
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:45 UTC
Updated2026-10-30 13:18:41 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7 HIGH from ADP

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

EPSS: 0.000170000 probability, percentile 0.040590000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo | CWE-416 | CWE-826 | CWE-826 Premature Release of Resource During Expected Lifetime | CWE-416 CWE-416 Use After Free

VersionSourceTypeScoreSeverityVector
3.1ADPCVSS7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected acf568ee859f098279eadf551612f103afdacb4e 4d06caedea587c59cc2cc893ceecc57c75c64312 git Not specified
CNA Linux Linux affected acf568ee859f098279eadf551612f103afdacb4e 94439cbe478b53f92223da9aae95fffb28623c3f git Not specified
CNA Linux Linux affected acf568ee859f098279eadf551612f103afdacb4e 4236c30b437b80f673b9e08c8fae38b8d471ac9e git Not specified
CNA Linux Linux affected acf568ee859f098279eadf551612f103afdacb4e 0f451b43c88bf2b9c038b414be580efee42e031b git Not specified
CNA Linux Linux affected acf568ee859f098279eadf551612f103afdacb4e 5002beda5cac69d522dc54da0d5d463ed9c963d2 git Not specified
CNA Linux Linux affected acf568ee859f098279eadf551612f103afdacb4e 1c428b03840094410c5fb6a5db30640486bbbfcb git Not specified
CNA Linux Linux affected 69895c5ea0ca2e8d7de1e6d36965d0ab9730787f git Not specified
CNA Linux Linux affected 833760100588acfb267dac4d6a02ab9931237739 git Not specified
CNA Linux Linux affected e095ecaec6d94aa2156cceb98a85d409b51190f3 git Not specified
CNA Linux Linux affected 3.2.100 3.3 semver Not specified
CNA Linux Linux affected 3.16.55 3.17 semver Not specified
CNA Linux Linux affected 4.14.24 4.15 semver Not specified
CNA Linux Linux affected 4.15 Not specified
CNA Linux Linux unaffected 4.15 semver Not specified
CNA Linux Linux unaffected 6.1.191 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.23 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.13 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 0:6.12.0-211.55.1.el10_2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8 unaffected 0:4.18.0-553.164.1.rt7.505.el8_10 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8 unaffected 0:4.18.0-553.164.1.el8_10 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9 unaffected 0:5.14.0-687.49.1.el9_8 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 9 Not specified Not specified

References

ReferenceSourceLinkTags
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31663.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
access.redhat.com/errata/RHSA-2026:68532 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4d06caedea587c59cc2cc893ceecc57c75c64312 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4236c30b437b80f673b9e08c8fae38b8d471ac9e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
access.redhat.com/security/cve/CVE-2026-31663 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
git.kernel.org/stable/c/94439cbe478b53f92223da9aae95fffb28623c3f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
access.redhat.com/errata/RHSA-2026:67471 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
access.redhat.com/errata/RHSA-2026:68570 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:68531 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-04-24T00:00:00.000ZReported to Red Hat.
ADP2026-04-24T00:00:00.000ZMade public.

Solutions

ADP: RHSA-2026:67471: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10)

ADP: RHSA-2026:68570: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9)

ADP: RHSA-2026:68531: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8)

ADP: RHSA-2026:68532: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)

Workarounds

ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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