Tracker / CVE-2024-26884
CVE-2024-26884
High 7.8
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix hashtab overflow check on 32-bit arches The hashtab code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. So apply the same fix to hashtab, by moving the overflow check to before the roundup.
Affected products and versions
| linux | linux_kernel · 3.19 → 4.19.311 |
|---|---|
| linux | linux_kernel · 4.20 → 5.4.273 |
| linux | linux_kernel · 5.11 → 5.15.153 |
| linux | linux_kernel · 5.16 → 6.1.83 |
| linux | linux_kernel · 5.5 → 5.10.214 |
| linux | linux_kernel · 6.2 → 6.6.23 |
| linux | linux_kernel · 6.7 → 6.7.11 |
| linux | linux_kernel · 6.8 → 6.8.2 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.