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Linux Kernel EUVDEUVD-2026-38717

| CVE-2026-52914 CRITICAL
Out-of-bounds Write (CWE-787)
2026-06-24 Linux GHSA-637x-w8p5-96wm
Buffer Overflow Denial Of Service Linux Memory Corruption 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
6.5 MEDIUM

Malformed fragments arrive over the layer-2 mesh so AV:A; no auth or interaction needed beyond mesh participation (PR:N/UI:N); upstream describes availability-only DoS, so C:N/I:N/A:H.

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

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
Jun 28, 2026 - 10:33 vuln.today
CVSS changed
Jun 28, 2026 - 08:22 NVD
9.8 (CRITICAL)
Patch available
Jun 24, 2026 - 09:16 EUVD
CVE Published
Jun 24, 2026 - 07:14 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 24, 2026 - 07:14 cve.org
CRITICAL 9.8

DescriptionCVE.org

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

batman-adv: fix fragment reassembly length accounting

batman-adv keeps a running payload length for queued fragments and uses it to validate a fragment chain before reassembly.

That accounting currently allows the accumulated fragment length to be truncated during updates. As a result, malformed fragment chains can bypass the intended validation and drive reassembly with inconsistent length state, leading to a local denial of service.

Fix the accounting by storing the accumulated length in a length-typed field and rejecting update overflows before the existing validation logic runs.

The fix was verified against the original reproducer and against valid fragment reassembly paths.

AnalysisAI

Denial of service in the Linux kernel's batman-adv mesh networking module arises from faulty length accounting during fragment reassembly, where the accumulated payload length can be truncated during updates, letting malformed fragment chains bypass validation and drive reassembly with inconsistent length state. The flaw affects systems running the B.A.T.M.A.N. Advanced (batman-adv) module across many stable kernel series and results in a local denial of service per the upstream description. There is no public exploit identified at time of analysis, EPSS is low (0.18%, 7th percentile), and the NVD CVSS of 9.8 conflicts with the upstream 'local denial of service' characterization.

Technical ContextAI

batman-adv is the in-kernel implementation of the B.A.T.M.A.N. Advanced layer-2 mesh routing protocol, which fragments and reassembles frames that exceed the mesh link MTU. To reassemble a fragment chain it maintains a running payload-length counter that is validated before frames are stitched back together. The bug is an integer/length accounting defect: the accumulated length was stored in a field that could be truncated during updates, so the running total no longer reflected the true chain size, defeating the pre-reassembly sanity check. The fix stores the accumulated length in a length-typed field and rejects update overflows before validation runs. CWE is not assigned in the input, but the root cause is an integer-truncation/overflow leading to incorrect length validation (CWE-190/CWE-682 class). The CPE data identifies only the generic vendor product (cpe:2.3:a:linux:linux) and does not pin the exact module or version range; version data comes from the EUVD/stable-tree commits.

RemediationAI

Vendor-released patch: upgrade to a fixed stable kernel - 5.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11, or 7.1 (or your distribution's backported equivalent), referencing the kernel.org commits such as https://git.kernel.org/stable/c/e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64 and https://git.kernel.org/stable/c/37be61825b15534a16ff9cfc9546de155b6df982. Because the vulnerable code path only executes when batman-adv is in use, the most effective compensating control where patching is delayed is to unload and blacklist the module if mesh networking is not required (modprobe -r batman_adv plus a blacklist entry), which fully removes the attack surface but disables any mesh functionality. Where batman-adv must run, restrict which interfaces participate in the mesh and limit physical/layer-2 access to trusted nodes to reduce who can inject crafted fragments; this does not fix the bug but narrows the attacker population.

Same weakness CWE-787 – Out-of-bounds Write

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CVE-2015-3113 CRITICAL POC
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7.8
CVE-2009-3129 HIGH POC
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CVE-2013-3346 CRITICAL POC
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Same technique Buffer Overflow

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CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-HPC-Azure Affected
Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-EC2 Image SLES15-SP7-EC2-ECS-HVM Image SLES15-SP7-GCE Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-HPC-BYOS-GCE Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-GCE Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Affected
Image SLES15-SP7-SAP-Azure Image SLES15-SP7-SAP-Azure-3P Image SLES15-SP7-SAP-BYOS-Azure Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-BYOS-GCE Image SLES15-SP7-SAP-EC2 Image SLES15-SP7-SAP-GCE Image SLES15-SP7-SAP-Hardened-Azure Image SLES15-SP7-SAP-Hardened-BYOS-Azure Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image SLES15-SP7-SAP-Hardened-BYOS-GCE Image SLES15-SP7-SAP-Hardened-GCE Affected
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed

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EUVD-2026-38717 vulnerability details – vuln.today
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