CVE-2026-99129 selinux: fix BPF token permission checks
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99129?
CVE-2026-99129 is a vulnerability in Linux, published on 28 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
selinux: fix BPF token permission checks
Avoid multiple lookups of the bpffs creator SID using the token's file descriptor when the same information can be found via the resolved path/dentry (in selinux_bpf_token_create()) or the token itself (in selinux_bpf_map_create() and selinux_bpf_prog_load()). Not only does this simplify the code, it avoids potential TOCTOU issues if the user changes the token file descriptor passed into the kernel.
Which versions are affected by CVE-2026-99129?
How do I fix CVE-2026-99129?
Upgrade to a fixed version.
Is CVE-2026-99129 being exploited?
There is no known exploitation of CVE-2026-99129 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-99129, GHSA-x4j5-868q-98xc, UBUNTU-CVE-2026-99129.