CVE-2026-31657
critical · 9.8In 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| linux | linux_kernel | >= 3.5.1, < 6.1.169 |
| linux | linux_kernel | >= 6.2, < 6.6.135 |
| linux | linux_kernel | >= 6.7, < 6.12.82 |
| linux | linux_kernel | >= 6.13, < 6.18.23 |
| linux | linux_kernel | >= 6.19, < 6.19.13 |
| linux | linux_kernel | 3.5 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
Check a specific version with /api/v1/cve/match.
References
- https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b
- https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f
- https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35
- https://git.kernel.org/stable/c/5202f071b367ffbc8e279fc7a00db14f5e587f52
- https://git.kernel.org/stable/c/69d1ce9c72eca91203ffdb8d08bacd511100aec6
- https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd
- https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2
- https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-31657