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CVE

CVE-2026-80681

vxlan: re-fetch eth header after route_shortcircuit()
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CVE

CVE-2026-80681

vxlan: re-fetch eth header after route_shortcircuit()

In the Linux kernel, the following vulnerability has been resolved:

vxlan: re-fetch eth header after route_shortcircuit()

Before routeshortcircuit(), the eth header pointer is cached from ethhdr(skb).

Inside routeshortcircuit(), pskbmay_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 = ethhdr(skb) after calling routeshortcircuit().

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff, https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5, https://git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585, https://git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5, https://git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555, https://git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56, https://git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4, https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80681.json, https://nvd.nist.gov/vuln/detail/CVE-2026-80681, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.005%
EPSS Percentile
0.40881%
Introduced Version
ae8840825605f36f98f247323edc150e761cb64e,3.10.0,5.11.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
1395a676ec15a0a02a2a6d86602324f2d5fd41d5,5.10.265,5.15.216,6.1.183,6.6.151,6.12.103,6.18.44,7.1.8,6.1.187-1,6.12.107-1~deb12u1,6.12.105-1,5.15.0-1117.124~20.04.1,5.15.0-1123.132~20.04.1,5.15.0-1122.131~20.04.1,5.15.0-1118.128~20.04.1,5.15.0-198.208~20.04.1,5.15.0-1111.115~20.04.1,5.15.0-1112.118~20.04.1,5.15.0-195.205~20.04.1,5.15.0-1114.120~20.04.1,5.15.0-198.208,5.15.0-1117.124,5.15.0-1123.132,5.15.0-1118.128,5.15.0-1113.119,5.15.0-1100.108,5.15.0-1111.115,5.15.0-1112.118,5.15.0-1109.114,5.15.0-195.205,5.15.0-1114.120,5.15.0-1080.84,0:6.12.0-207.111.5.1.el10uek,0:5.15.0-325.220.5.el8uek,0:5.15.0-324.217.5.2.el8uek,0:6.12.0-207.111.5.1.el9uek,0:5.15.0-325.220.5.el9uek,0:5.15.0-324.217.5.2.el9uek,1:6.18.44-99.149.amzn2023,1:1.0-0.amzn2023,1:6.12.103-127.188.amzn2023,1:6.1.186-228.374.amzn2023,0:5.10.265-265.1078.amzn2,0:1.0-0.amzn2,0:5.15.220-153.252.amzn2

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