CVE-2024-26884

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.

• linux linux kernel (>= 3.19 < 4.19.311) • linux linux kernel (>= 4.20 < 5.4.273) • linux linux kernel (>= 5.5 < 5.10.214) • linux linux kernel (>= 5.11 < 5.15.153) • linux linux kernel (>= 5.16 < 6.1.83) • linux linux kernel (>= 6.2 < 6.6.23) • linux linux kernel (>= 6.7 < 6.7.11) • linux linux kernel (>= 6.8 < 6.8.2)