batman-adv: frag: disallow unicast fragment in fragment
Summary
| CVE | CVE-2026-52916 |
|---|---|
| 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: frag: disallow unicast fragment in fragment batadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a BATADV_UNICAST_FRAG packet is received. Once all fragments are collected and the packet is reassembled, batadv_recv_frag_packet() calls batadv_batman_skb_recv() again to process the defragmented payload. A malicious sender can craft a BATADV_UNICAST_FRAG packet whose reassembled payload is itself a BATADV_UNICAST_FRAG packet (matryoshka-style nesting). Each nesting level recurses through batadv_batman_skb_recv() without bound, growing the kernel stack until it is exhausted. Since refragmentation or fragments in fragments are not actually allowed, discard all packets which are still BATADV_UNICAST_FRAG packets after the defragmentation process. |
Risk And Classification
EPSS: 0.001770000 probability, percentile 0.074310000 (date 2026-06-25)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 0c208fa3859e3a33a1c38bebc41d021166e94ac8 git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 bcda4814dc6524283c0b958882cb963d75fe411d git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 aea54d0bbe156d5ab7d00d68f66149ff41f4612a git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 b54e459cf86943583c1aa2ee3081874e7ab1f5f3 git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 5418be6c2e117bf8a316582795a8e3ff90f45e5d git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 5895ad21c7059a652da83fb817510f7a1e962abf git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 7138c35c9ad39a2fca6264af6b87466471f04ffc git | Not specified |
| CNA | Linux | Linux | affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 bc62216dc8e221e3781afa14430f45208bfa9af9 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/bc62216dc8e221e3781afa14430f45208bfa9af9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/5418be6c2e117bf8a316582795a8e3ff90f45e5d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7138c35c9ad39a2fca6264af6b87466471f04ffc | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/bcda4814dc6524283c0b958882cb963d75fe411d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/5895ad21c7059a652da83fb817510f7a1e962abf | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/aea54d0bbe156d5ab7d00d68f66149ff41f4612a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b54e459cf86943583c1aa2ee3081874e7ab1f5f3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/0c208fa3859e3a33a1c38bebc41d021166e94ac8 | 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.