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CVE-2026-80681

CRITICALCVSS 9.8/10EPSS 0.18%

Last modified

CVE-2026-80681 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. In 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().. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

In 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().

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
0.18%

7.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= ae8840825605f36f98f247323edc150e761cb64e, < 6375093eb45cd7d89f1945f939eeae3b29d79f56; >= ae8840825605f36f98f247323edc150e761cb64e, < 1b7f7b653e3557690047c62f03b80a24ea5a58a5; >= ae8840825605f36f98f247323edc150e761cb64e, < bf045341dfb3e767f0ff94cf240ce3c371973bd4; >= ae8840825605f36f98f247323edc150e761cb64e, < 2355c8c26d2aa1b4385b369e67202e47d460d555; >= ae8840825605f36f98f247323edc150e761cb64e, < 1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585; >= ae8840825605f36f98f247323edc150e761cb64e, < 1235e017aa11cf01e91b613c4c5ed6aa28934fff; >= ae8840825605f36f98f247323edc150e761cb64e, < c9dceac9e1c7c772c43c732fc0d325e72835801a; >= ae8840825605f36f98f247323edc150e761cb64e, < 1395a676ec15a0a02a2a6d86602324f2d5fd41d5
LinuxLinux3.10

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-80681?
In 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().
How severe is CVE-2026-80681?
CVE-2026-80681 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-80681?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST