Out-of-bounds read in Linux kernel - CVE-2026-98376
Published: October 9, 2026
Vulnerability identifier: #VU154053
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98376
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to read memory outside the bounds of a per-cpu array's pointer storage.
The vulnerability exists due to an out-of-bounds read caused by missing max_entries validation in the BPF per-cpu array inner-map handling code when processing lookups after an inner map is replaced with a smaller map. A local user can replace an inner map with one containing fewer entries and trigger a lookup using the original template's JIT-inlined index_mask to read memory outside the bounds of the pptrs[] array.
Affected software
Linux kernel
How to mitigate CVE-2026-98376
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3