{"id":"AZL-102347","summary":"CVE-2026-90250 affecting package kernel 6.6.150.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, cgroup: Fix storage null-ptr-deref after replacing prog\n\nSyzkaller reported a storage null-ptr-deref issue after replacing prog.\nThis occurs in the following scenario:\n1. prog A, an empty prog, is attached to a cgrp.\n2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the\n   bpf_get_local_storage helper.\n3. link_update is called to replace prog A with prog B.\n\nThe reason is that __cgroup_bpf_replace fails to alloc and assign the\nrequired cgrp storage for the incoming replacement prog. Consequently,\nthe new prog inherits an uninit storage, leading to null-ptr-deref panic\nwhen kick the new prog.\n\nFix this by rejecting a link update if new_prog's cgroup storage is\nincompatible with link-\u003eprog.","modified":"2026-09-18T14:17:49.997023671Z","published":"2026-09-17T17:17:21Z","upstream":["CVE-2026-90250"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90250"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.150.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-102347.json"}}],"schema_version":"1.9.0"}