Medium · published May 1, 2026
In the Linux kernel, the following vulnerability has been resolved:
net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak
When building netlink messages, tc_chain_fill_node() never initializes
the tcm_info field of struct tcmsg. Since the allocation is not zeroed,
kernel heap memory is leaked to userspace through this 4-byte field.
The fix simply zeroes tcm_info alongside the other fields that are
already initialized.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 4.19, < 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 | — |