ipvlan: inherit needed_headroom and needed_tailroom from phy_dev

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74744
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-26 15:16:53 UTC
Updated2026-08-27 06:17:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ipvlan: inherit needed_headroom and needed_tailroom from phy_dev ipvlan devices inherit hard_header_len from phy_dev during ipvlan_init(), but leave needed_headroom and needed_tailroom set to 0. When the underlying phy_dev (or stacked lower device) requires extra headroom or tailroom for headers/trailers (e.g. macsec, ipsec, wireguard, tunnels, or veth with rx headroom), upper layers calculating packet headroom and tailroom fail to reserve sufficient space. This can result in reallocation overhead, skb headroom underflows, or KASAN slab-use-after-free crashes when dev_hard_header() / ipvlan_hard_header() prepends header data or when lower devices append tailroom. Fix this by: 1. Inheriting needed_headroom and needed_tailroom from phy_dev in ipvlan_init(). 2. Propagating needed_headroom and needed_tailroom updates to attached ipvlans in ipvlan_device_event() when receiving NETDEV_FEAT_CHANGE events.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.005190000 probability, percentile 0.419190000 (date 2026-08-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2ad7bf3638411cb547f2823df08166c13ab04269 af602c4d0ee548da18e2409b4b4da1079625a372 git Not specified
CNA Linux Linux affected 2ad7bf3638411cb547f2823df08166c13ab04269 f3c17ff65f54781cde696e16a6c577615ed735aa git Not specified
CNA Linux Linux affected 2ad7bf3638411cb547f2823df08166c13ab04269 c0fbe31f6b20ade0465130685859faa5c86fda59 git Not specified
CNA Linux Linux affected 2ad7bf3638411cb547f2823df08166c13ab04269 5f33188457bbcc1b11ca87084037963c516ed3d9 git Not specified
CNA Linux Linux affected 2ad7bf3638411cb547f2823df08166c13ab04269 5c2ca77212eb38559b0353b8363b7a84f4b019dd git Not specified
CNA Linux Linux affected 2ad7bf3638411cb547f2823df08166c13ab04269 e16e960d55a40d36bd7c2494cc005e757dc9a1ef git Not specified
CNA Linux Linux affected 3.19 Not specified
CNA Linux Linux unaffected 3.19 semver Not specified
CNA Linux Linux unaffected 6.1.184 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.153 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.105 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.46 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.10 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5f33188457bbcc1b11ca87084037963c516ed3d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c0fbe31f6b20ade0465130685859faa5c86fda59 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f3c17ff65f54781cde696e16a6c577615ed735aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/af602c4d0ee548da18e2409b4b4da1079625a372 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5c2ca77212eb38559b0353b8363b7a84f4b019dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e16e960d55a40d36bd7c2494cc005e757dc9a1ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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