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CVE-2025-37752

Description

In the Linux kernel, the following vulnerability has been resolved:net_sched: sch_sfq: move the limit validationIt is not sufficient to directly validate the limit on the data thatthe user passes as it can be updated based on how the other parametersare changed.Move the check at the end of the configuration update process to alsocatch scenarios where the limit is indirectly updated, for examplewith the following configurations:tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1This fixes the following syzkaller reported crash:------------[ cut here ]------------UBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6index 65535 is out of range for type 'struct sfq_head[128]'CPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429 sfq_link net/sched/sch_sfq.c:203 [inline] sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231 sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493 sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311 netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline] dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375

POC

Reference

No PoCs from references.

Github

- https://github.com/0xor0ne/awesome-list

- https://github.com/ARPSyndicate/cve-scores

- https://github.com/w4zu/Debian_security

- https://github.com/xairy/linux-kernel-exploitation