| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-21692: net: sched: fix ets qdisc OOB Indexing |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: sched: fix ets qdisc OOB Indexing |
| |
| Haowei Yan <g1042620637@gmail.com> found that ets_class_from_arg() can |
| index an Out-Of-Bound class in ets_class_from_arg() when passed clid of |
| 0. The overflow may cause local privilege escalation. |
| |
| [ 18.852298] ------------[ cut here ]------------ |
| [ 18.853271] UBSAN: array-index-out-of-bounds in net/sched/sch_ets.c:93:20 |
| [ 18.853743] index 18446744073709551615 is out of range for type 'ets_class [16]' |
| [ 18.854254] CPU: 0 UID: 0 PID: 1275 Comm: poc Not tainted 6.12.6-dirty #17 |
| [ 18.854821] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 |
| [ 18.856532] Call Trace: |
| [ 18.857441] <TASK> |
| [ 18.858227] dump_stack_lvl+0xc2/0xf0 |
| [ 18.859607] dump_stack+0x10/0x20 |
| [ 18.860908] __ubsan_handle_out_of_bounds+0xa7/0xf0 |
| [ 18.864022] ets_class_change+0x3d6/0x3f0 |
| [ 18.864322] tc_ctl_tclass+0x251/0x910 |
| [ 18.864587] ? lock_acquire+0x5e/0x140 |
| [ 18.865113] ? __mutex_lock+0x9c/0xe70 |
| [ 18.866009] ? __mutex_lock+0xa34/0xe70 |
| [ 18.866401] rtnetlink_rcv_msg+0x170/0x6f0 |
| [ 18.866806] ? __lock_acquire+0x578/0xc10 |
| [ 18.867184] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 |
| [ 18.867503] netlink_rcv_skb+0x59/0x110 |
| [ 18.867776] rtnetlink_rcv+0x15/0x30 |
| [ 18.868159] netlink_unicast+0x1c3/0x2b0 |
| [ 18.868440] netlink_sendmsg+0x239/0x4b0 |
| [ 18.868721] ____sys_sendmsg+0x3e2/0x410 |
| [ 18.869012] ___sys_sendmsg+0x88/0xe0 |
| [ 18.869276] ? rseq_ip_fixup+0x198/0x260 |
| [ 18.869563] ? rseq_update_cpu_node_id+0x10a/0x190 |
| [ 18.869900] ? trace_hardirqs_off+0x5a/0xd0 |
| [ 18.870196] ? syscall_exit_to_user_mode+0xcc/0x220 |
| [ 18.870547] ? do_syscall_64+0x93/0x150 |
| [ 18.870821] ? __memcg_slab_free_hook+0x69/0x290 |
| [ 18.871157] __sys_sendmsg+0x69/0xd0 |
| [ 18.871416] __x64_sys_sendmsg+0x1d/0x30 |
| [ 18.871699] x64_sys_call+0x9e2/0x2670 |
| [ 18.871979] do_syscall_64+0x87/0x150 |
| [ 18.873280] ? do_syscall_64+0x93/0x150 |
| [ 18.874742] ? lock_release+0x7b/0x160 |
| [ 18.876157] ? do_user_addr_fault+0x5ce/0x8f0 |
| [ 18.877833] ? irqentry_exit_to_user_mode+0xc2/0x210 |
| [ 18.879608] ? irqentry_exit+0x77/0xb0 |
| [ 18.879808] ? clear_bhb_loop+0x15/0x70 |
| [ 18.880023] ? clear_bhb_loop+0x15/0x70 |
| [ 18.880223] ? clear_bhb_loop+0x15/0x70 |
| [ 18.880426] entry_SYSCALL_64_after_hwframe+0x76/0x7e |
| [ 18.880683] RIP: 0033:0x44a957 |
| [ 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 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 8974 24 10 |
| [ 18.881766] RSP: 002b:00007ffcdd00fad8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e |
| [ 18.882149] RAX: ffffffffffffffda RBX: 00007ffcdd010db8 RCX: 000000000044a957 |
| [ 18.882507] RDX: 0000000000000000 RSI: 00007ffcdd00fb70 RDI: 0000000000000003 |
| [ 18.885037] RBP: 00007ffcdd010bc0 R08: 000000000703c770 R09: 000000000703c7c0 |
| [ 18.887203] R10: 0000000000000080 R11: 0000000000000246 R12: 0000000000000001 |
| [ 18.888026] R13: 00007ffcdd010da8 R14: 00000000004ca7d0 R15: 0000000000000001 |
| [ 18.888395] </TASK> |
| [ 18.888610] ---[ end trace ]--- |
| |
| The Linux kernel CVE team has assigned CVE-2025-21692 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.6 with commit dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and fixed in 5.10.234 with commit 03c56665dab1f4ac844bc156652d50d639093fa5 |
| Issue introduced in 5.6 with commit dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and fixed in 5.15.178 with commit bcf0d815e728a3a304b50455b32a3170c16e1eaa |
| Issue introduced in 5.6 with commit dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and fixed in 6.1.128 with commit 1332c6ed446be787f901ed1064ec6a3c694f028a |
| Issue introduced in 5.6 with commit dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and fixed in 6.6.75 with commit f4168299e553f17aa2ba4016e77a9c38da40eb1d |
| Issue introduced in 5.6 with commit dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and fixed in 6.12.12 with commit 997f6ec4208b23c87daf9f044689685f091826f7 |
| Issue introduced in 5.6 with commit dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and fixed in 6.13.1 with commit f6b0f05fbfa4044f890e8a348288c0d9a20bd1d0 |
| Issue introduced in 5.6 with commit dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and fixed in 6.14 with commit d62b04fca4340a0d468d7853bd66e511935a18cb |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-21692 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| net/sched/sch_ets.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/03c56665dab1f4ac844bc156652d50d639093fa5 |
| https://git.kernel.org/stable/c/bcf0d815e728a3a304b50455b32a3170c16e1eaa |
| https://git.kernel.org/stable/c/1332c6ed446be787f901ed1064ec6a3c694f028a |
| https://git.kernel.org/stable/c/f4168299e553f17aa2ba4016e77a9c38da40eb1d |
| https://git.kernel.org/stable/c/997f6ec4208b23c87daf9f044689685f091826f7 |
| https://git.kernel.org/stable/c/f6b0f05fbfa4044f890e8a348288c0d9a20bd1d0 |
| https://git.kernel.org/stable/c/d62b04fca4340a0d468d7853bd66e511935a18cb |
