Description
In the Linux kernel, the following vulnerability has been resolved: net: sched: avoid qdisc_reset_all_tx_gt() vs dequeue race for lockless qdiscs When shrinking the number of real tx queues, netif_set_real_num_tx_queues() calls qdisc_reset_all_tx_gt() to flush qdiscs for queues which will no longer be used. qdisc_reset_all_tx_gt() currently serializes qdisc_reset() with qdisc_lock(). However, for lockless qdiscs, the dequeue path is serialized by qdisc_run_begin/end() using qdisc->seqlock instead, so qdisc_reset() can run concurrently with __qdisc_run() and free skbs while they are still being dequeued, leading to UAF. This can easily be reproduced on e.g. virtio-net by imposing heavy traffic while frequently changing the number of queue pairs: iperf3 -ub0 -c $peer -t 0 & while :; do ethtool -L eth0 combined 1 ethtool -L eth0 combined 2 done With KASAN enabled, this leads to reports like: BUG: KASAN: slab-use-after-free in __qdisc_run+0x133f/0x1760 ... Call Trace: ... __qdisc_run+0x133f/0x1760 __dev_queue_xmit+0x248f/0x3550 ip_finish_output2+0xa42/0x2110 ip_output+0x1a7/0x410 ip_send_skb+0x2e6/0x480 udp_send_skb+0xb0a/0x1590 udp_sendmsg+0x13c9/0x1fc0 ... Allocated by task 1270 on cpu 5 at 44.558414s: ... alloc_skb_with_frags+0x84/0x7c0 sock_alloc_send_pskb+0x69a/0x830 __ip_append_data+0x1b86/0x48c0 ip_make_skb+0x1e8/0x2b0 udp_sendmsg+0x13a6/0x1fc0 ... Freed by task 1306 on cpu 3 at 44.558445s: ... kmem_cache_free+0x117/0x5e0 pfifo_fast_reset+0x14d/0x580 qdisc_reset+0x9e/0x5f0 netif_set_real_num_tx_queues+0x303/0x840 virtnet_set_channels+0x1bf/0x260 [virtio_net] ethnl_set_channels+0x684/0xae0 ethnl_default_set_doit+0x31a/0x890 ... Serialize qdisc_reset_all_tx_gt() against the lockless dequeue path by taking qdisc->seqlock for TCQ_F_NOLOCK qdiscs, matching the serialization model already used by dev_reset_queue(). Additionally clear QDISC_STATE_NON_EMPTY after reset so the qdisc state reflects an empty queue, avoiding needless re-scheduling.
Mitigation
Minimal update. May introduce new vulnerabilities or breaking changes.
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 rpm rhel8 | | - | - |
rpm rhel9 | | - | - |
rpm rhel9 | | - | - |
rpm rhel6 | | - | - |
rpm rhel10 | | - | - |
rpm rhel8 | | - | - |
 debian 11 | | =5.10.103-1 || =5.10.103-1~bpo10+1 || =5.10.106-1 || =5.10.113-1 || =5.10.120-1 || =5.10.120-1~bpo10+1 || =5.10.127-1 || =5.10.127-2 || =5.10.127-2~bpo10+1 || =5.10.136-1 || =5.10.140-1 || =5.10.148-1 || =5.10.149-1 || =5.10.149-2 || =5.10.158-1 || =5.10.158-2 || =5.10.162-1 || =5.10.178-1 || =5.10.178-2 || =5.10.178-3 || =5.10.179-1 || =5.10.179-2 || =5.10.179-3 || =5.10.179-4 || =5.10.179-5 || =5.10.191-1 || =5.10.197-1 || =5.10.205-1 || =5.10.205-2 || =5.10.209-1 || =5.10.209-2 || =5.10.216-1 || =5.10.218-1 || =5.10.221-1 || =5.10.223-1 || =5.10.226-1 || =5.10.234-1 || =5.10.237-1 || =5.10.244-1 || =5.10.247-1 || =5.10.249-1 || =5.10.251-1 || =5.10.251-3 || =5.10.46-4 || =5.10.46-5 || =5.10.70-1 || =5.10.70-1~bpo10+1 || =5.10.84-1 || =5.10.92-1 || =5.10.92-1~bpo10+1 || =5.10.92-2 || =5.13.12-1~exp1 || =5.13.9-1~exp1 || =5.13.9-1~exp2 || =5.14-1~exp1 || =5.14-1~exp2 || =5.14.1-1~exp1 || =5.14.12-1 || =5.14.16-1 || =5.14.2-1~exp1 || =5.14.3-1~exp1 || =5.14.6-1 || =5.14.6-2 || =5.14.6-3 || =5.14.9-1 || =5.14.9-2 || =5.14.9-2~bpo11+1 || =5.15-1~exp1 || =5.15.1-1~exp1 || =5.15.15-1 || =5.15.15-2 || =5.15.15-2~bpo11+1 || =5.15.2-1~exp1 || =5.15.3-1 || =5.15.5-1 || =5.15.5-2 || =5.15.5-2~bpo11+1 || =5.16.10-1 || =5.16.11-1 || =5.16.11-1~bpo11+1 || =5.16.12-1 || =5.16.12-1~bpo11+1 || =5.16.14-1 || =5.16.18-1 || =5.16.3-1~exp1 || =5.16.4-1~exp1 || =5.16.7-1 || =5.16.7-2 || =5.16~rc1-1~exp1 || =5.16~rc3-1~exp1 || =5.16~rc4-1~exp1 || =5.16~rc5-1~exp1 || =5.16~rc6-1~exp1 || =5.16~rc7-1~exp1 || =5.16~rc8-1~exp1 || =5.17.1-1~exp1 || =5.17.11-1 || =5.17.3-1 || =5.17.6-1 || =5.17~rc3-1~exp1 || =5.17~rc4-1~exp1 || =5.17~rc5-1~exp1 || =5.17~rc6-1~exp1 || =5.17~rc7-1~exp1 || =5.17~rc8-1~exp1 || =5.18-1~exp1 || =5.18.14-1 || =5.18.14-1~bpo11+1 || =5.18.16-1 || =5.18.16-1~bpo11+1 || =5.18.2-1 || =5.18.2-1~bpo11+1 || =5.18.5-1 || =5.19-1~exp1 || =5.19.11-1 || =5.19.11-1~bpo11+1 || =5.19.6-1 || =5.19~rc4-1~exp1 || =5.19~rc6-1~exp1 || =6.0-1~exp1 || =6.0.10-1 || =6.0.10-2 || =6.0.12-1 || =6.0.12-1+alpha || =6.0.12-1~bpo11+1 || =6.0.2-1 || =6.0.3-1 || =6.0.3-1~bpo11+1 || =6.0.5-1 || =6.0.6-1 || =6.0.6-2 || =6.0.7-1 || =6.0.8-1 || =6.0~rc7-1~exp1 || =6.1.1-1~exp1 || =6.1.1-1~exp2 || =6.1.106-1 || =6.1.106-2 || =6.1.106-3 || =6.1.11-1 || =6.1.112-1 || =6.1.115-1 || =6.1.119-1 || =6.1.12-1 || =6.1.12-1~bpo11+1 || =6.1.123-1 || =6.1.124-1 || =6.1.128-1 || =6.1.129-1 || =6.1.133-1 || =6.1.135-1 || =6.1.137-1 || =6.1.139-1 || =6.1.140-1 || =6.1.147-1 || =6.1.148-1 || =6.1.15-1 || =6.1.15-1~bpo11+1 || =6.1.153-1 || =6.1.158-1 || =6.1.159-1 || =6.1.162-1 || =6.1.164-1 || =6.1.170-1 || =6.1.2-1~exp1 || =6.1.20-1 || =6.1.20-1~bpo11+1 || =6.1.20-2 || =6.1.20-2~bpo11+1 || =6.1.25-1 || =6.1.27-1 || =6.1.27-1~bpo11+1 || =6.1.37-1 || =6.1.38-1 || =6.1.38-2 || =6.1.38-2~bpo11+1 || =6.1.38-3 || =6.1.38-4 || =6.1.38-4~bpo11+1 || =6.1.4-1 || =6.1.52-1 || =6.1.55-1 || =6.1.55-1~bpo11+1 || =6.1.64-1 || =6.1.66-1 || =6.1.67-1 || =6.1.69-1 || =6.1.69-1~bpo11+1 || =6.1.7-1 || =6.1.76-1 || =6.1.76-1~bpo11+1 || =6.1.8-1 || =6.1.8-1+sh4 || =6.1.82-1 || =6.1.85-1 || =6.1.90-1 || =6.1.90-1~bpo11+1 || =6.1.94-1 || =6.1.94-1~bpo11+1 || =6.1.98-1 || =6.1.99-1 || =6.10-1~exp1 || =6.10.1-1~exp1 || =6.10.11-1 || =6.10.11-1~bpo12+1 || =6.10.12-1 || =6.10.3-1 || =6.10.4-1 || =6.10.6-1 || =6.10.6-1~bpo12+1 || =6.10.7-1 || =6.10.9-1 || =6.11-1~exp1 || =6.11.10-1 || =6.11.10-1~bpo12+1 || =6.11.2-1 || =6.11.4-1 || =6.11.5-1 || =6.11.5-1~bpo12+1 || =6.11.6-1 || =6.11.7-1 || =6.11.9-1 || =6.11~rc4-1~exp1 || =6.11~rc5-1~exp1 || =6.12.10-1 || =6.12.11-1 || =6.12.11-1+alpha || =6.12.11-1+alpha.1 || =6.12.12-1 || =6.12.12-1~bpo12+1 || =6.12.13-1 || =6.12.15-1 || =6.12.16-1 || =6.12.17-1 || =6.12.19-1 || =6.12.20-1 || =6.12.21-1 || =6.12.22-1 || =6.12.22-1~bpo12+1 || =6.12.25-1 || =6.12.27-1 || =6.12.27-1~bpo12+1 || =6.12.29-1 || =6.12.3-1 || =6.12.30-1 || =6.12.30-1~bpo12+1 || =6.12.31-1 || =6.12.32-1 || =6.12.32-1~bpo12+1 || =6.12.33-1 || =6.12.33-1~bpo12+1 || =6.12.35-1 || =6.12.35-1~bpo12+1 || =6.12.37-1 || =6.12.38-1 || =6.12.38-1~bpo12+1 || =6.12.41-1 || =6.12.43-1 || =6.12.43-1~bpo12+1 || =6.12.48-1 || =6.12.5-1 || =6.12.57-1 || =6.12.57-1~bpo12+1 || =6.12.6-1 || =6.12.63-1 || =6.12.63-1~bpo12+1 || =6.12.69-1 || =6.12.69-1~bpo12+1 || =6.12.73-1 || =6.12.73-1~bpo12+1 || =6.12.74-1 || =6.12.74-2 || =6.12.74-2~bpo12+1 || =6.12.8-1 || =6.12.85-1 || =6.12.85-1~bpo12+1 || =6.12.9-1 || =6.12.9-1+alpha || =6.12.9-1~bpo12+1 || =6.12~rc6-1~exp1 || =6.13.10-1~exp1 || =6.13.11-1~exp1 || =6.13.2-1~exp1 || =6.13.3-1~exp1 || =6.13.4-1~exp1 || =6.13.5-1~exp1 || =6.13.6-1~exp1 || =6.13.7-1~exp1 || =6.13.8-1~exp1 || =6.13.9-1~exp1 || =6.13~rc6-1~exp1 || =6.13~rc7-1~exp1 || =6.14.3-1~exp1 || =6.14.5-1~exp1 || =6.14.6-1~exp1 || =6.15-1~exp1 || =6.15.1-1~exp1 || =6.15.2-1~exp1 || =6.15.3-1~exp1 || =6.15.4-1~exp1 || =6.15.5-1~exp1 || =6.15.6-1~exp1 || =6.15~rc7-1~exp1 || =6.16-1~exp1 || =6.16.1-1~exp1 || =6.16.10-1 || =6.16.11-1 || =6.16.12-1 || =6.16.12-1~bpo13+1 || =6.16.12-2 || =6.16.3-1 || =6.16.3-1~bpo13+1 || =6.16.5-1 || =6.16.6-1 || =6.16.7-1 || =6.16.8-1 || =6.16.9-1 || =6.16~rc7-1~exp1 || =6.17.10-1 || =6.17.11-1 || =6.17.12-1 || =6.17.13-1 || =6.17.13-1~bpo13+1 || =6.17.2-1~exp1 || =6.17.5-1~exp1 || =6.17.6-1 || =6.17.7-1 || =6.17.7-2 || =6.17.8-1 || =6.17.8-1~bpo13+1 || =6.17.9-1 || =6.18.1-1~exp1 || =6.18.10-1 || =6.18.12-1 || =6.18.12-1~bpo13+1 || =6.18.13-1 || =6.18.14-1 || =6.18.15-1 || =6.18.15-1~bpo13+1 || =6.18.2-1~exp1 || =6.18.3-1 || =6.18.5-1 || =6.18.5-1~bpo13+1 || =6.18.8-1 || =6.18.9-1 || =6.18.9-1~bpo13+1 || =6.18~rc4-1~exp1 || =6.18~rc4-1~exp2 || =6.18~rc5-1~exp1 || =6.18~rc6-1~exp1 || =6.18~rc7-1~exp1 || =6.19-1~exp1 || =6.19.10-1 || =6.19.10-1~bpo13+1 || =6.19.11-1 || =6.19.11-1~bpo13+1 || =6.19.12-1 || =6.19.13-1 || =6.19.13-1~bpo13+1 || =6.19.14-1 || =6.19.2-1~exp1 || =6.19.3-1~exp1 || =6.19.4-1~exp1 || =6.19.5-1~exp1 || =6.19.6-1 || =6.19.6-2 || =6.19.6-2~bpo13+1 || =6.19.8-1 || =6.19.8-1~bpo13+1 || =6.19~rc4-1~exp1 || =6.19~rc5-1~exp1 || =6.19~rc6-1~exp1 || =6.19~rc7-1~exp1 || =6.19~rc8-1~exp1 || =6.1~rc3-1~exp1 || =6.1~rc5-1~exp1 || =6.1~rc6-1~exp1 || =6.1~rc7-1~exp1 || =6.1~rc8-1~exp1 || =6.3.1-1~exp1 || =6.3.11-1 || =6.3.2-1~exp1 || =6.3.4-1~exp1 || =6.3.5-1~exp1 || =6.3.7-1 || =6.3.7-1~bpo12+1 || =6.4.1-1~exp1 || =6.4.11-1 || =6.4.13-1 || =6.4.4-1 || =6.4.4-1~bpo12+1 || =6.4.4-2 || =6.4.4-3 || =6.4.4-3~bpo12+1 || =6.4~rc6-1~exp1 || =6.4~rc7-1~exp1 || =6.5.1-1~exp1 || =6.5.10-1 || =6.5.10-1~bpo12+1 || =6.5.13-1 || =6.5.3-1 || =6.5.3-1~bpo12+1 || =6.5.6-1 || =6.5.8-1 || =6.5~rc4-1~exp1 || =6.5~rc6-1~exp1 || =6.5~rc7-1~exp1 || =6.6.11-1 || =6.6.13-1 || =6.6.13-1~bpo12+1 || =6.6.15-1 || =6.6.15-2 || =6.6.3-1~exp1 || =6.6.4-1~exp1 || =6.6.7-1~exp1 || =6.6.8-1 || =6.6.9-1 || =6.7-1~exp1 || =6.7.1-1~exp1 || =6.7.12-1 || =6.7.12-1~bpo12+1 || =6.7.4-1~exp1 || =6.7.7-1 || =6.7.9-1 || =6.7.9-2 || =6.8.11-1 || =6.8.12-1 || =6.8.12-1~bpo12+1 || =6.8.9-1 || =6.9.10-1 || =6.9.10-1~bpo12+1 || =6.9.11-1 || =6.9.12-1 || =6.9.2-1~exp1 || =6.9.7-1 || =6.9.7-1~bpo12+1 || =6.9.8-1 || =6.9.9-1 || =7.0-1~exp1 || =7.0.1-1~exp1 || =7.0.3-1 | - |
debian 12 | | =6.1.106-1 || =6.1.106-2 || =6.1.106-3 || =6.1.112-1 || =6.1.115-1 || =6.1.119-1 || =6.1.123-1 || =6.1.124-1 || =6.1.128-1 || =6.1.129-1 || =6.1.133-1 || =6.1.135-1 || =6.1.137-1 || =6.1.139-1 || =6.1.140-1 || =6.1.147-1 || =6.1.148-1 || =6.1.153-1 || =6.1.158-1 || =6.1.159-1 || =6.1.162-1 || =6.1.164-1 || =6.1.27-1 || =6.1.37-1 || =6.1.38-1 || =6.1.38-2 || =6.1.38-2~bpo11+1 || =6.1.38-3 || =6.1.38-4 || =6.1.38-4~bpo11+1 || =6.1.52-1 || =6.1.55-1 || =6.1.55-1~bpo11+1 || =6.1.64-1 || =6.1.66-1 || =6.1.67-1 || =6.1.69-1 || =6.1.69-1~bpo11+1 || =6.1.76-1 || =6.1.76-1~bpo11+1 || =6.1.82-1 || =6.1.85-1 || =6.1.90-1 || =6.1.90-1~bpo11+1 || =6.1.94-1 || =6.1.94-1~bpo11+1 || =6.1.98-1 || =6.1.99-1 || >=0 <6.1.170-1 | 6.1.170-1 |
debian 13 | | =6.12.38-1 || =6.12.41-1 || =6.12.43-1 || =6.12.43-1~bpo12+1 || =6.12.48-1 || =6.12.57-1 || =6.12.57-1~bpo12+1 || =6.12.63-1 || =6.12.63-1~bpo12+1 || =6.12.69-1 || =6.12.69-1~bpo12+1 || =6.12.73-1 || =6.12.73-1~bpo12+1 || =6.12.74-1 || =6.12.74-2 || =6.12.74-2~bpo12+1 || =6.12.85-1~bpo12+1 || >=0 <6.12.85-1 | 6.12.85-1 |
debian 14 | | =6.12.38-1 || =6.12.41-1 || =6.12.43-1 || =6.12.43-1~bpo12+1 || =6.12.48-1 || =6.12.57-1 || =6.12.57-1~bpo12+1 || =6.12.63-1 || =6.12.63-1~bpo12+1 || =6.12.69-1 || =6.12.69-1~bpo12+1 || =6.12.73-1 || =6.12.73-1~bpo12+1 || =6.12.74-1 || =6.12.74-2 || =6.12.74-2~bpo12+1 || =6.12.85-1 || =6.12.85-1~bpo12+1 || =6.13.10-1~exp1 || =6.13.11-1~exp1 || =6.13.2-1~exp1 || =6.13.3-1~exp1 || =6.13.4-1~exp1 || =6.13.5-1~exp1 || =6.13.6-1~exp1 || =6.13.7-1~exp1 || =6.13.8-1~exp1 || =6.13.9-1~exp1 || =6.13~rc6-1~exp1 || =6.13~rc7-1~exp1 || =6.14.3-1~exp1 || =6.14.5-1~exp1 || =6.14.6-1~exp1 || =6.15-1~exp1 || =6.15.1-1~exp1 || =6.15.2-1~exp1 || =6.15.3-1~exp1 || =6.15.4-1~exp1 || =6.15.5-1~exp1 || =6.15.6-1~exp1 || =6.15~rc7-1~exp1 || =6.16-1~exp1 || =6.16.1-1~exp1 || =6.16.10-1 || =6.16.11-1 || =6.16.12-1 || =6.16.12-1~bpo13+1 || =6.16.12-2 || =6.16.3-1 || =6.16.3-1~bpo13+1 || =6.16.5-1 || =6.16.6-1 || =6.16.7-1 || =6.16.8-1 || =6.16.9-1 || =6.16~rc7-1~exp1 || =6.17.10-1 || =6.17.11-1 || =6.17.12-1 || =6.17.13-1 || =6.17.13-1~bpo13+1 || =6.17.2-1~exp1 || =6.17.5-1~exp1 || =6.17.6-1 || =6.17.7-1 || =6.17.7-2 || =6.17.8-1 || =6.17.8-1~bpo13+1 || =6.17.9-1 || =6.18.1-1~exp1 || =6.18.10-1 || =6.18.12-1 || =6.18.12-1~bpo13+1 || =6.18.13-1 || =6.18.14-1 || =6.18.15-1 || =6.18.15-1~bpo13+1 || =6.18.2-1~exp1 || =6.18.3-1 || =6.18.5-1 || =6.18.5-1~bpo13+1 || =6.18.8-1 || =6.18.9-1 || =6.18.9-1~bpo13+1 || =6.18~rc4-1~exp1 || =6.18~rc4-1~exp2 || =6.18~rc5-1~exp1 || =6.18~rc6-1~exp1 || =6.18~rc7-1~exp1 || =6.19-1~exp1 || =6.19.2-1~exp1 || =6.19.3-1~exp1 || =6.19.4-1~exp1 || =6.19.5-1~exp1 || =6.19.6-1 || =6.19.6-2 || =6.19.6-2~bpo13+1 || =6.19.8-1~bpo13+1 || =6.19~rc4-1~exp1 || =6.19~rc5-1~exp1 || =6.19~rc6-1~exp1 || =6.19~rc7-1~exp1 || =6.19~rc8-1~exp1 || >=0 <6.19.8-1 | 6.19.8-1 |
