batman-adv: fix fragment reassembly length accounting
Summary
| CVE | CVE-2026-52914 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-24 08:16:21 UTC |
| Updated | 2026-06-24 08:16:21 UTC |
| 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. |
Risk And Classification
EPSS: 0.001780000 probability, percentile 0.075330000 (date 2026-06-27)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64 git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 37be61825b15534a16ff9cfc9546de155b6df982 git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 975563c5de1123dde1ec7946bf5556d20c89d74e git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 f653b040dad1af70fa5cd4fe085e4758925480c9 git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 e910dbf509125fe51ad68e4fa74dc8ab0a8e787a git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 3eb8bcb823391bd58997831b3c9c152a4ba8e255 git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0 git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 9cd3f16c320bfdadd4509358122368deb56a5741 git | Not specified |
| CNA | Linux | Linux | affected 3.13 | Not specified |
| CNA | Linux | Linux | unaffected 3.13 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.258 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.209 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.175 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.142 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.92 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.34 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.11 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/9cd3f16c320bfdadd4509358122368deb56a5741 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f653b040dad1af70fa5cd4fe085e4758925480c9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e910dbf509125fe51ad68e4fa74dc8ab0a8e787a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/37be61825b15534a16ff9cfc9546de155b6df982 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/3eb8bcb823391bd58997831b3c9c152a4ba8e255 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/975563c5de1123dde1ec7946bf5556d20c89d74e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.