Critical 9.8Published Jun 24, 2026

CVE-2026-52914batman-adv: fix fragment reassembly length accounting

Updated under an hour ago (Oct 28, 2026, 1:23 PM ET)

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Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-190
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 610bfc6bc99bc83680d190ebc69359a05fc7f605 before e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64; 610bfc6bc99bc83680d190ebc69359a05fc7f605 builds before 37be61825b15534a16ff9cfc9546de155b6df982; from 610bfc6bc99bc83680d190ebc69359a05fc7f605 before 975563c5de1123dde1ec7946bf5556d20c89d74e; from 610bfc6bc99bc83680d190ebc69359a05fc7f605 before f653b040dad1af70fa5cd4fe085e4758925480c9; from 610bfc6bc99bc83680d190ebc69359a05fc7f605 before e910dbf509125fe51ad68e4fa74dc8ab0a8e787a; 610bfc6bc99bc83680d190ebc69359a05fc7f605 builds before 3eb8bcb823391bd58997831b3c9c152a4ba8e255; from 610bfc6bc99bc83680d190ebc69359a05fc7f605 before fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0; 610bfc6bc99bc83680d190ebc69359a05fc7f605 builds before 9cd3f16c320bfdadd4509358122368deb56a5741	CNA record
linux linux_kernel linux:linux_kernel	from 3.13 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; and 3 more ranges	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.