{"id":"AZL-77682","summary":"CVE-2026-23126 affecting package kernel for versions less than 6.6.126.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetdevsim: fix a race issue related to the operation on bpf_bound_progs list\n\nThe netdevsim driver lacks a protection mechanism for operations on the\nbpf_bound_progs list. When the nsim_bpf_create_prog() performs\nlist_add_tail, it is possible that nsim_bpf_destroy_prog() is\nsimultaneously performs list_del. Concurrent operations on the list may\nlead to list corruption and trigger a kernel crash as follows:\n\n[  417.290971] kernel BUG at lib/list_debug.c:62!\n[  417.290983] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI\n[  417.290992] CPU: 10 PID: 168 Comm: kworker/10:1 Kdump: loaded Not tainted 6.19.0-rc5 #1\n[  417.291003] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[  417.291007] Workqueue: events bpf_prog_free_deferred\n[  417.291021] RIP: 0010:__list_del_entry_valid_or_report+0xa7/0xc0\n[  417.291034] Code: a8 ff 0f 0b 48 89 fe 48 89 ca 48 c7 c7 48 a1 eb ae e8 ed fb a8 ff 0f 0b 48 89 fe 48 89 c2 48 c7 c7 80 a1 eb ae e8 d9 fb a8 ff \u003c0f\u003e 0b 48 89 d1 48 c7 c7 d0 a1 eb ae 48 89 f2 48 89 c6 e8 c2 fb a8\n[  417.291040] RSP: 0018:ffffb16a40807df8 EFLAGS: 00010246\n[  417.291046] RAX: 000000000000006d RBX: ffff8e589866f500 RCX: 0000000000000000\n[  417.291051] RDX: 0000000000000000 RSI: ffff8e59f7b23180 RDI: ffff8e59f7b23180\n[  417.291055] RBP: ffffb16a412c9000 R08: 0000000000000000 R09: 0000000000000003\n[  417.291059] R10: ffffb16a40807c80 R11: ffffffffaf9edce8 R12: ffff8e594427ac20\n[  417.291063] R13: ffff8e59f7b44780 R14: ffff8e58800b7a05 R15: 0000000000000000\n[  417.291074] FS:  0000000000000000(0000) GS:ffff8e59f7b00000(0000) knlGS:0000000000000000\n[  417.291079] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  417.291083] CR2: 00007fc4083efe08 CR3: 00000001c3626006 CR4: 0000000000770ee0\n[  417.291088] PKRU: 55555554\n[  417.291091] Call Trace:\n[  417.291096]  \u003cTASK\u003e\n[  417.291103]  nsim_bpf_destroy_prog+0x31/0x80 [netdevsim]\n[  417.291154]  __bpf_prog_offload_destroy+0x2a/0x80\n[  417.291163]  bpf_prog_dev_bound_destroy+0x6f/0xb0\n[  417.291171]  bpf_prog_free_deferred+0x18e/0x1a0\n[  417.291178]  process_one_work+0x18a/0x3a0\n[  417.291188]  worker_thread+0x27b/0x3a0\n[  417.291197]  ? __pfx_worker_thread+0x10/0x10\n[  417.291207]  kthread+0xe5/0x120\n[  417.291214]  ? __pfx_kthread+0x10/0x10\n[  417.291221]  ret_from_fork+0x31/0x50\n[  417.291230]  ? __pfx_kthread+0x10/0x10\n[  417.291236]  ret_from_fork_asm+0x1a/0x30\n[  417.291246]  \u003c/TASK\u003e\n\nAdd a mutex lock, to prevent simultaneous addition and deletion operations\non the list.","modified":"2026-08-28T17:47:33.436483801Z","published":"2026-02-14T15:16:07Z","upstream":["CVE-2026-23126"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23126"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.126.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-77682.json"}}],"schema_version":"1.9.0"}