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Linux Kernel EUVDEUVD-2026-67557

| CVE-2026-80681 CRITICAL
2026-08-28 Linux GHSA-6mmh-5qqr-f237
Information Disclosure Linux Red Hat Suse
Critical
Disputed · 9.8 Vendor: Linux
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Severity by source

Sources disagree (Medium–Critical)
Vendor (Linux) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
5.9 MEDIUM

Reachable only via a configured VXLAN proxy overlay (adjacent) and gated on a non-deterministic skb reallocation race (AC:H); impact is primarily a kernel crash (A:H) with possible limited memory leak (C:L).

3.1 AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
4.0 AV:A/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
7.0 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: Linux

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

Lifecycle Timeline

5
Analysis Generated
Aug 29, 2026 - 07:58 vuln.today
CVSS changed
Aug 29, 2026 - 07:22 NVD
9.8 (CRITICAL)
Patch available
Aug 28, 2026 - 09:02 EUVD
CVE Published
Aug 28, 2026 - 06:52 cve.org
CRITICAL 9.8
CVE Published
Aug 28, 2026 - 06:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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().

AnalysisAI

Use-after-free in the Linux kernel's VXLAN transmit path (vxlan_xmit) lets a stale Ethernet header pointer be dereferenced after route_shortcircuit() calls pskb_may_pull() and reallocates skb->head, corrupting or reading freed memory when accessing eth->h_dest. The flaw affects systems using a VXLAN overlay interface and is most realistically a denial-of-service (kernel crash) with potential information disclosure; no public exploit identified at time of analysis and EPSS is low (0.18%). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Requires a configured VXLAN interface with the proxy/ARP-shortcircuit feature enabled, because route_shortcircuit() - the function that reallocates the skb via pskb_may_pull() - is only reached on that proxy path; on default deployments without VXLAN, or with VXLAN but proxy disabled, the vulnerable code is never executed. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:H, 9.8 Critical) overstates real-world risk for this bug and conflicts with the other signals. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: upgrade to a fixed stable kernel - 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, or 7.2 (or later on your branch), matching the fix commits at https://git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56 and siblings. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory systems and virtual infrastructure using VXLAN overlay interfaces to understand exposure scope. …

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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EUVD-2026-67557 vulnerability details – vuln.today
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