CVE-2026-52914 | 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 lengt
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.
- 🔗 git.kernel.org/stable/c/e4f3f6b818aa6a678bc54a2d4e0bece2…
- 🔗 git.kernel.org/stable/c/37be61825b15534a16ff9cfc9546de15…
- 🔗 git.kernel.org/stable/c/975563c5de1123dde1ec7946bf5556d2…
- 🔗 git.kernel.org/stable/c/f653b040dad1af70fa5cd4fe085e4758…
- 🔗 git.kernel.org/stable/c/e910dbf509125fe51ad68e4fa74dc8ab…
- 🔗 git.kernel.org/stable/c/3eb8bcb823391bd58997831b3c9c152a…
- 🔗 git.kernel.org/stable/c/fdb2c96efb2baeb3725e9ce3ede8f1e3…
- 🔗 git.kernel.org/stable/c/9cd3f16c320bfdadd4509358122368de…
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CVE-2026-52914 | 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 lengt
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 reass