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.
Metrics
Affected Vendors & Products
References
History
No history.
MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2024-04-17T10:27:39.672Z
Updated: 2024-08-02T00:21:05.540Z
Reserved: 2024-02-19T14:20:24.185Z
Link: CVE-2024-26884
Vulnrichment
Updated: 2024-06-17T19:18:34.078Z
NVD
Status : Modified
Published: 2024-04-17T11:15:10.163
Modified: 2024-06-27T12:15:22.003
Link: CVE-2024-26884
Redhat