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Vulnerability record · CVE-2026-52914 · published 24 June 2026

CVE-2026-52914: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 0.75% · top 46.8% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score
0.75%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
8 Jul 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/37be61825b15534a16ff9cfc9546de155b6df982 Patch
https://git.kernel.org/stable/c/3eb8bcb823391bd58997831b3c9c152a4ba8e255 Patch
https://git.kernel.org/stable/c/975563c5de1123dde1ec7946bf5556d20c89d74e Patch
https://git.kernel.org/stable/c/9cd3f16c320bfdadd4509358122368deb56a5741 Patch
https://git.kernel.org/stable/c/e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64 Patch
https://git.kernel.org/stable/c/e910dbf509125fe51ad68e4fa74dc8ab0a8e787a Patch
https://git.kernel.org/stable/c/f653b040dad1af70fa5cd4fe085e4758925480c9 Patch
https://git.kernel.org/stable/c/fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-52914), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.