In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix stackmap overflow check on 32-bit arches
The stackmap 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.
The commit in the fixes tag actually attempted to fix this, but the fix
did not account for the UB, so the fix only works on CPUs where an
overflow does result in a neat truncation to zero, which is not
guaranteed. Checking the value before rounding does not have this
problem.
References
Configurations
Configuration 1 (hide)
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History
No history.
Information
Published : 2024-04-17 11:15
Updated : 2024-06-27 12:15
NVD link : CVE-2024-26883
Mitre link : CVE-2024-26883
CVE.ORG link : CVE-2024-26883
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer