CVE-2024-26884

Published Apr 17, 2024

Last updated 10 days ago

CVSS high 7.8

Overview

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: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status: Modified

Risk scores

CVSS 3.1

Type: Primary
Base score: 7.8
Impact score: 5.9
Exploitability score: 1.8
Vector string: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity: HIGH

Weaknesses

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

Hype score: Not currently trending

Configurations

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Overview

Risk scores

CVSS 3.1

Weaknesses

Social media

Configurations

References