Medium · published August 26, 2024
In the Linux kernel, the following vulnerability has been resolved:
tracing: Fix overflow in get_free_elt()
"tracing_map->next_elt" in get_free_elt() is at risk of overflowing.
Once it overflows, new elements can still be inserted into the tracing_map
even though the maximum number of elements (`max_elts`) has been reached.
Continuing to insert elements after the overflow could result in the
tracing_map containing "tracing_map->max_size" elements, leaving no empty
entries.
If any attempt is made to insert an element into a full tracing_map using
`__tracing_map_insert()`, it will cause an infinite loop with preemption
disabled, leading to a CPU hang problem.
Fix this by preventing any further increments to "tracing_map->next_elt"
once it reaches "tracing_map->max_elt".
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 4.7, < 4.19.320 | 4.19.320 |
| linux/linux_kernel | ≥ 4.20, < 5.4.282 | 5.4.282 |
| linux/linux_kernel | ≥ 5.5, < 5.10.224 | 5.10.224 |
| linux/linux_kernel | ≥ 5.11, < 5.15.165 | 5.15.165 |
| linux/linux_kernel | ≥ 5.16, < 6.1.105 | 6.1.105 |
| linux/linux_kernel | ≥ 6.2, < 6.6.46 | 6.6.46 |
| linux/linux_kernel | ≥ 6.7, < 6.10.5 | 6.10.5 |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |