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 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.

• 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

Published

Sep 17, 2026

Last Modified

Sep 17, 2026

Status

Received

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