Medium · published February 4, 2026
In the Linux kernel, the following vulnerability has been resolved:
crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec
authencesn assumes an ESP/ESN-formatted AAD. When assoclen is shorter than
the minimum expected length, crypto_authenc_esn_decrypt() can advance past
the end of the destination scatterlist and trigger a NULL pointer dereference
in scatterwalk_map_and_copy(), leading to a kernel panic (DoS).
Add a minimum AAD length check to fail fast on invalid inputs.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 4.3, < 5.10.249 | 5.10.249 |
| linux/linux_kernel | ≥ 5.11, < 5.15.199 | 5.15.199 |
| linux/linux_kernel | ≥ 5.16, < 6.1.162 | 6.1.162 |
| linux/linux_kernel | ≥ 6.2, < 6.6.122 | 6.6.122 |
| linux/linux_kernel | ≥ 6.7, < 6.12.68 | 6.12.68 |
| linux/linux_kernel | ≥ 6.13, < 6.18.8 | 6.18.8 |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |