| Name | CVE-2024-26884 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | buster | 4.19.249-2 | vulnerable |
| buster (security) | 4.19.304-1 | vulnerable | |
| bullseye | 5.10.209-2 | vulnerable | |
| bullseye (security) | 5.10.205-2 | vulnerable | |
| bookworm | 6.1.76-1 | vulnerable | |
| bookworm (security) | 6.1.85-1 | fixed | |
| trixie | 6.6.15-2 | vulnerable | |
| sid | 6.7.12-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | bookworm | 6.1.85-1 | |||
| linux | source | (unstable) | 6.7.12-1 |
https://git.kernel.org/linus/6787d916c2cf9850c97a0a3f73e08c43e7d973b1 (6.9-rc1)