VULNERABILITY INTELLIGENCE

CVE-2024-26884

CVSS score7.8 HIGH
EPSS probability0.25%
CISA KEVNot currently listed
Published2024-04-17
Last modified2026-10-15
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • nvd@nist.gov: CWE-119
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-190

Primary references