AZL-102347
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-102347.json
- JSON Data
- https://api.osv.dev/v1/vulns/AZL-102347
- Upstream
- Published
- 2026-09-17T17:17:21Z
- Modified
- 2026-09-18T14:17:49Z
- Summary
- CVE-2026-90250 affecting package kernel 6.6.150.1-1
- Details
-
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:
- prog A, an empty prog, is attached to a cgrp.
- prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the bpf_get_local_storage helper.
- 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