Description
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: hold claim backbone gateways by reference
batadv_bla_add_claim() can replace claim->backbone_gw and drop the old gateway's last reference while readers still follow the pointer.
The netlink claim dump path dereferences claim->backbone_gw->orig and takes claim->backbone_gw->crc_lock without pinning the underlying backbone gateway. batadv_bla_check_claim() still has the same naked pointer access pattern.
Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate on a stable gateway reference until the read-side work is complete. This keeps the dump and claim-check paths aligned with the lifetime rules introduced for the other BLA claim readers.
Metrics
CVSS 3.1 9.8/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 23721387c409087fd3b97e274f34d3ddc0970b74, < 5202f071b367ffbc8e279fc7a00db14f5e587f52; >= 23721387c409087fd3b97e274f34d3ddc0970b74, < 69d1ce9c72eca91203ffdb8d08bacd511100aec6; >= 23721387c409087fd3b97e274f34d3ddc0970b74, < f4858832ddef2f39f21e30b7226bbcd3c4b2bc96; >= 23721387c409087fd3b97e274f34d3ddc0970b74, < 2f55b58b5a0bbed192d60c444a45a49cdf1b545f; >= 23721387c409087fd3b97e274f34d3ddc0970b74, < 7962b522222628596ca9ecc8722efc95367aadbd; >= 23721387c409087fd3b97e274f34d3ddc0970b74, < 4dee4c0688443aaf5bbec74aa203c851d1d53c35; >= 23721387c409087fd3b97e274f34d3ddc0970b74, < 1f2dc36c297d27733f1b380ea644cf15a361bd7b; >= 23721387c409087fd3b97e274f34d3ddc0970b74, < 82d8701b2c930d0e96b0dbc9115a218d791cb0d2 |
| Linux | Linux | 3.5 |
References
- https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7bPatch
- https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545fPatch
- https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35Patch
- https://git.kernel.org/stable/c/5202f071b367ffbc8e279fc7a00db14f5e587f52
- https://git.kernel.org/stable/c/69d1ce9c72eca91203ffdb8d08bacd511100aec6
- https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbdPatch
- https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2Patch
- https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96Patch
Timeline
- Published
- Apr 24, 2026
- Last modified
- Nov 11, 2026
- NVD status
- Modified