vxlan: re-fetch eth header after route_shortcircuit()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80681
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:53 UTC
Updated2026-08-29 07:16:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: vxlan: re-fetch eth header after route_shortcircuit() Before route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb). Inside route_shortcircuit(), pskb_may_pull() can be called, which may reallocate skb->head. In this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to freed memory, leading to a use-after-free when dereferencing eth->h_dest. Fix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().

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: 0.001760000 probability, percentile 0.072300000 (date 2026-08-28)

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 ae8840825605f36f98f247323edc150e761cb64e 6375093eb45cd7d89f1945f939eeae3b29d79f56 git Not specified
CNA Linux Linux affected ae8840825605f36f98f247323edc150e761cb64e 1b7f7b653e3557690047c62f03b80a24ea5a58a5 git Not specified
CNA Linux Linux affected ae8840825605f36f98f247323edc150e761cb64e bf045341dfb3e767f0ff94cf240ce3c371973bd4 git Not specified
CNA Linux Linux affected ae8840825605f36f98f247323edc150e761cb64e 2355c8c26d2aa1b4385b369e67202e47d460d555 git Not specified
CNA Linux Linux affected ae8840825605f36f98f247323edc150e761cb64e 1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585 git Not specified
CNA Linux Linux affected ae8840825605f36f98f247323edc150e761cb64e 1235e017aa11cf01e91b613c4c5ed6aa28934fff git Not specified
CNA Linux Linux affected ae8840825605f36f98f247323edc150e761cb64e c9dceac9e1c7c772c43c732fc0d325e72835801a git Not specified
CNA Linux Linux affected ae8840825605f36f98f247323edc150e761cb64e 1395a676ec15a0a02a2a6d86602324f2d5fd41d5 git Not specified
CNA Linux Linux affected 3.10 Not specified
CNA Linux Linux unaffected 3.10 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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