Out-of-bounds read in Linux kernel - CVE-2026-97420

Vulnerability details

The vulnerability allows a local privileged user to read out-of-bounds memory.

The vulnerability exists due to a missing NUL terminator in the bpf_sysctl_set_new_value helper when replacing a pending sysctl value through a cgroup/sysctl BPF program. A local privileged user can provide a replacement sysctl value without a terminating NUL byte to read out-of-bounds memory.

Affected software

How to mitigate CVE-2026-97420

External References

• https://git.kernel.org/stable/c/3b2814dd842a565fcf9cc370156e1ba9eae16239
• https://git.kernel.org/stable/c/76c14b10f50eb0afcc76e244562fa2d8c661e224
• https://git.kernel.org/stable/c/a66e3b5bacf38d6ab29fa05a9754f7a114485605

Related Security Bulletins

• Out-of-bounds read in Linux kernel bpf