CVE-2025-38684

In the Linux kernel, the following vulnerability has been resolved:

net/sched: ets: use old 'nbands' while purging unused classes

Shuang reported sch_ets test-case [1] crashing in ets_class_qlen_notify()

after recent changes from Lion [2]. The problem is: in ets_qdisc_change()

we purge unused DWRR queues; the value of 'q->nbands' is the new one, and

the cleanup should be done with the old one. The problem is here since my

first attempts to fix ets_qdisc_change(), but it surfaced again after the

recent qdisc len accounting fixes. Fix it purging idle DWRR queues before

assigning a new value of 'q->nbands', so that all purge operations find a

consistent configuration:

- old 'q->nbands' because it's needed by ets_class_find()

- old 'q->nstrict' because it's needed by ets_class_is_strict()

BUG: kernel NULL pointer dereference, address: 0000000000000000

#PF: supervisor read access in kernel mode

#PF: error_code(0x0000) - not-present page

PGD 0 P4D 0

Oops: Oops: 0000 [#1] SMP NOPTI

CPU: 62 UID: 0 PID: 39457 Comm: tc Kdump: loaded Not tainted 6.12.0-116.el10.x86_64 #1 PREEMPT(voluntary)

Hardware name: Dell Inc. PowerEdge R640/06DKY5, BIOS 2.12.2 07/09/2021

RIP: 0010:__list_del_entry_valid_or_report+0x4/0x80

Code: ff 4c 39 c7 0f 84 39 19 8e ff b8 01 00 00 00 c3 cc cc cc cc 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <48> 8b 17 48 8b 4f 08 48 85 d2 0f 84 56 19 8e ff 48 85 c9 0f 84 ab

RSP: 0018:ffffba186009f400 EFLAGS: 00010202

RAX: 00000000000000d6 RBX: 0000000000000000 RCX: 0000000000000004

RDX: ffff9f0fa29b69c0 RSI: 0000000000000000 RDI: 0000000000000000

RBP: ffffffffc12c2400 R08: 0000000000000008 R09: 0000000000000004

R10: ffffffffffffffff R11: 0000000000000004 R12: 0000000000000000

R13: ffff9f0f8cfe0000 R14: 0000000000100005 R15: 0000000000000000

FS: 00007f2154f37480(0000) GS:ffff9f269c1c0000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000000000000 CR3: 00000001530be001 CR4: 00000000007726f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

PKRU: 55555554

Call Trace:

<TASK>

ets_class_qlen_notify+0x65/0x90 [sch_ets]

qdisc_tree_reduce_backlog+0x74/0x110

ets_qdisc_change+0x630/0xa40 [sch_ets]

__tc_modify_qdisc.constprop.0+0x216/0x7f0

tc_modify_qdisc+0x7c/0x120

rtnetlink_rcv_msg+0x145/0x3f0

netlink_rcv_skb+0x53/0x100

netlink_unicast+0x245/0x390

netlink_sendmsg+0x21b/0x470

____sys_sendmsg+0x39d/0x3d0

___sys_sendmsg+0x9a/0xe0

__sys_sendmsg+0x7a/0xd0

do_syscall_64+0x7d/0x160

entry_SYSCALL_64_after_hwframe+0x76/0x7e

RIP: 0033:0x7f2155114084

Code: 89 02 b8 ff ff ff ff eb bb 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 80 3d 25 f0 0c 00 00 74 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89

RSP: 002b:00007fff1fd7a988 EFLAGS: 00000202 ORIG_RAX: 000000000000002e

RAX: ffffffffffffffda RBX: 0000560ec063e5e0 RCX: 00007f2155114084

RDX: 0000000000000000 RSI: 00007fff1fd7a9f0 RDI: 0000000000000003

RBP: 00007fff1fd7aa60 R08: 0000000000000010 R09: 000000000000003f

R10: 0000560ee9b3a010 R11: 0000000000000202 R12: 00007fff1fd7aae0

R13: 000000006891ccde R14: 0000560ec063e5e0 R15: 00007fff1fd7aad0

</TASK>

[1] https://lore.kernel.org/netdev/e08c7f4a6882f260011909a868311c6e9b54f3e4.1639153474.git.dcaratti@redhat.com/

[2] https://lore.kernel.org/netdev/[email protected]/