Medium · published April 13, 2026
In the Linux kernel, the following vulnerability has been resolved:
netfilter: ipset: drop logically empty buckets in mtype_del
mtype_del() counts empty slots below n->pos in k, but it only drops the
bucket when both n->pos and k are zero. This misses buckets whose live
entries have all been removed while n->pos still points past deleted slots.
Treat a bucket as empty when all positions below n->pos are unused and
release it directly instead of shrinking it further.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 5.4.24, < 5.5 | 5.5 |
| linux/linux_kernel | ≥ 5.5.8, < 5.6 | 5.6 |
| linux/linux_kernel | ≥ 5.6.1, < 5.10.253 | 5.10.253 |
| linux/linux_kernel | ≥ 5.11, < 5.15.203 | 5.15.203 |
| linux/linux_kernel | ≥ 5.16, < 6.1.168 | 6.1.168 |
| linux/linux_kernel | ≥ 6.2, < 6.6.134 | 6.6.134 |
| linux/linux_kernel | ≥ 6.7, < 6.12.81 | 6.12.81 |
| linux/linux_kernel | ≥ 6.13, < 6.18.22 | 6.18.22 |
| linux/linux_kernel | ≥ 6.19, < 6.19.12 | 6.19.12 |
| 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 | — |
| 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 | — |