Fixed
Created: Apr 17, 2024
Updated: Jun 27, 2024
Resolved Date: Jun 27, 2024
Found In Version: 10.21.20.1
Fix Version: 10.21.20.22
Severity: Standard
Applicable for: Wind River Linux LTS 21
Component/s: Kernel
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.
CREATE(Triage):(User=admin) CVE-2024-26884 (https://nvd.nist.gov/vuln/detail/CVE-2024-26884)