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.
History

Fri, 22 Nov 2024 12:00:00 +0000


Tue, 05 Nov 2024 10:45:00 +0000


Wed, 30 Oct 2024 20:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-190
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-04-17T10:27:39.672Z

Updated: 2024-12-19T08:49:27.929Z

Reserved: 2024-02-19T14:20:24.185Z

Link: CVE-2024-26884

cve-icon Vulnrichment

Updated: 2024-08-02T00:21:05.540Z

cve-icon NVD

Status : Modified

Published: 2024-04-17T11:15:10.163

Modified: 2024-11-21T09:03:17.677

Link: CVE-2024-26884

cve-icon Redhat

Severity : Low

Publid Date: 2024-04-17T00:00:00Z

Links: CVE-2024-26884 - Bugzilla