UNKNOWN NVD
CVE-2026-90250
In the Linux kernel, the following vulnerability has been resolved: bpf, cgroup: Fix storage null-ptr-deref after replacing prog Syzkaller reported a storage
In the Linux kernel, the following vulnerability has been resolved:
bpf, cgroup: Fix storage null-ptr-deref after replacing prog
Syzkaller reported a storage null-ptr-deref issue after replacing prog.
This occurs in the following scenario:
1. prog A, an empty prog, is attached to a cgrp.
2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the
bpf_get_local_storage helper.
3. link_update is called to replace prog A with prog B.
The reason is that __cgroup_bpf_replace fails to alloc and assign the
required cgrp storage for the incoming replacement prog. Consequently,
the new prog inherits an uninit storage, leading to null-ptr-deref panic
when kick the new prog.
Fix this by rejecting a link update if new_prog's cgroup storage is
incompatible with link->prog.
References
- https://git.kernel.org/stable/c/12feca126831556dc7fabe5a3ba28fbd328768b6
- https://git.kernel.org/stable/c/1ab3da12061d7ccb099f7e925fa2d865967a316a
- https://git.kernel.org/stable/c/3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94
- https://git.kernel.org/stable/c/a033c950f6731be88a7da98604ed78f302f15b80
This unknown severity vulnerability was published on 2026-09-17 via NVD.
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