Out-of-bounds read in Linux kernel - CVE-2026-98149
Published: September 28, 2026
Vulnerability identifier: #VU152289
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98149
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause incorrect per-CPU values and an out-of-bounds read.
The vulnerability exists due to improper indexing in per-CPU BPF array, hash, and cgroup storage map update paths when processing per-CPU map updates without BPF_F_CPU or BPF_F_ALL_CPUS. A local user can submit a crafted per-CPU map update to cause incorrect per-CPU values and an out-of-bounds read.
Exploitation requires a possible CPU mask with sparse CPU IDs.
Affected software
Linux kernel
How to mitigate CVE-2026-98149
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3