{"id":"AZL-57012","summary":"CVE-2025-21692 affecting package kernel for versions less than 5.15.180.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: fix ets qdisc OOB Indexing\n\nHaowei Yan \u003cg1042620637@gmail.com\u003e found that ets_class_from_arg() can\nindex an Out-Of-Bound class in ets_class_from_arg() when passed clid of\n0. The overflow may cause local privilege escalation.\n\n [   18.852298] ------------[ cut here ]------------\n [   18.853271] UBSAN: array-index-out-of-bounds in net/sched/sch_ets.c:93:20\n [   18.853743] index 18446744073709551615 is out of range for type 'ets_class [16]'\n [   18.854254] CPU: 0 UID: 0 PID: 1275 Comm: poc Not tainted 6.12.6-dirty #17\n [   18.854821] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n [   18.856532] Call Trace:\n [   18.857441]  \u003cTASK\u003e\n [   18.858227]  dump_stack_lvl+0xc2/0xf0\n [   18.859607]  dump_stack+0x10/0x20\n [   18.860908]  __ubsan_handle_out_of_bounds+0xa7/0xf0\n [   18.864022]  ets_class_change+0x3d6/0x3f0\n [   18.864322]  tc_ctl_tclass+0x251/0x910\n [   18.864587]  ? lock_acquire+0x5e/0x140\n [   18.865113]  ? __mutex_lock+0x9c/0xe70\n [   18.866009]  ? __mutex_lock+0xa34/0xe70\n [   18.866401]  rtnetlink_rcv_msg+0x170/0x6f0\n [   18.866806]  ? __lock_acquire+0x578/0xc10\n [   18.867184]  ? __pfx_rtnetlink_rcv_msg+0x10/0x10\n [   18.867503]  netlink_rcv_skb+0x59/0x110\n [   18.867776]  rtnetlink_rcv+0x15/0x30\n [   18.868159]  netlink_unicast+0x1c3/0x2b0\n [   18.868440]  netlink_sendmsg+0x239/0x4b0\n [   18.868721]  ____sys_sendmsg+0x3e2/0x410\n [   18.869012]  ___sys_sendmsg+0x88/0xe0\n [   18.869276]  ? rseq_ip_fixup+0x198/0x260\n [   18.869563]  ? rseq_update_cpu_node_id+0x10a/0x190\n [   18.869900]  ? trace_hardirqs_off+0x5a/0xd0\n [   18.870196]  ? syscall_exit_to_user_mode+0xcc/0x220\n [   18.870547]  ? do_syscall_64+0x93/0x150\n [   18.870821]  ? __memcg_slab_free_hook+0x69/0x290\n [   18.871157]  __sys_sendmsg+0x69/0xd0\n [   18.871416]  __x64_sys_sendmsg+0x1d/0x30\n [   18.871699]  x64_sys_call+0x9e2/0x2670\n [   18.871979]  do_syscall_64+0x87/0x150\n [   18.873280]  ? do_syscall_64+0x93/0x150\n [   18.874742]  ? lock_release+0x7b/0x160\n [   18.876157]  ? do_user_addr_fault+0x5ce/0x8f0\n [   18.877833]  ? irqentry_exit_to_user_mode+0xc2/0x210\n [   18.879608]  ? irqentry_exit+0x77/0xb0\n [   18.879808]  ? clear_bhb_loop+0x15/0x70\n [   18.880023]  ? clear_bhb_loop+0x15/0x70\n [   18.880223]  ? clear_bhb_loop+0x15/0x70\n [   18.880426]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n [   18.880683] RIP: 0033:0x44a957\n [   18.880851] Code: ff ff e8 fc 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 8974 24 10\n [   18.881766] RSP: 002b:00007ffcdd00fad8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\n [   18.882149] RAX: ffffffffffffffda RBX: 00007ffcdd010db8 RCX: 000000000044a957\n [   18.882507] RDX: 0000000000000000 RSI: 00007ffcdd00fb70 RDI: 0000000000000003\n [   18.885037] RBP: 00007ffcdd010bc0 R08: 000000000703c770 R09: 000000000703c7c0\n [   18.887203] R10: 0000000000000080 R11: 0000000000000246 R12: 0000000000000001\n [   18.888026] R13: 00007ffcdd010da8 R14: 00000000004ca7d0 R15: 0000000000000001\n [   18.888395]  \u003c/TASK\u003e\n [   18.888610] ---[ end trace ]---","modified":"2026-04-01T05:19:01.217210Z","published":"2025-02-10T16:15:38Z","upstream":["CVE-2025-21692"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21692"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:2","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.180.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-57012.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}