UNKNOWN NVD
CVE-2026-80929
In the Linux kernel, the following vulnerability has been resolved: sysctl: move the "cad_pid" entry from pid_table[] to kern_reboot_table[] cad_pid is global
In the Linux kernel, the following vulnerability has been resolved:
sysctl: move the "cad_pid" entry from pid_table[] to kern_reboot_table[]
cad_pid is global, and kill_cad_pid() is only used in the root namespace.
However, due to pid_table_root_permissions(), a non-root user can unshare
pid/user namespaces and modify it from the child namespace. This makes no
sense and is simply wrong.
Move it to kern_reboot_table[] where it logically belongs; this ensures
that only GLOBAL_ROOT_UID can read/modify this sysctl.
Note that this patch doesn't preserve "#ifdef CONFIG_PROC_SYSCTL" around
the "cad_pid"; CONFIG_PROC_SYSCTL selects CONFIG_SYSCTL, so it is always
set when kern_reboot_table[] is compiled.
References
- https://git.kernel.org/stable/c/7170ca01623b399c97f2ae9d3e228badc1f25ea3
- https://git.kernel.org/stable/c/a09bc4eaa67e1a72df3b6d0beb3afeef1e1fdfcd
- https://git.kernel.org/stable/c/e8527de7fea191fda704792a56081f9009aeec37
This unknown severity vulnerability was published on 2026-09-11 via NVD.
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