CVE-2026-23449 net/sched: teql: Fix double-free in teql_master_xmit
In the Linux kernel, the following vulnerability has been resolved:

net/sched: teql: Fix double-free in teql_master_xmit

Whenever a TEQL devices has a lockless Qdisc as root, qdisc_reset should
be called using the seq_lock to avoid racing with the datapath. Failure
to do so may cause crashes like the following:

[  238.028993][  T318] BUG: KASAN: double-free in skb_release_data (net/core/skbuff.c:1139)
[  238.029328][  T318] Free of addr ffff88810c67ec00 by task poc_teql_uaf_ke/318
[  238.029749][  T318]
[  238.029900][  T318] CPU: 3 UID: 0 PID: 318 Comm: poc_teql_ke Not tainted 7.0.0-rc3-00149-ge5b31d988a41 #704 PREEMPT(full)
[  238.029906][  T318] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  238.029910][  T318] Call Trace:
[  238.029913][  T318]  <TASK>
[  238.029916][  T318]  dump_stack_lvl (lib/dump_stack.c:122)
[  238.029928][  T318]  print_report (mm/kasan/report.c:379 mm/kasan/report.c:482)
[  238.029940][  T318]  ? skb_release_data (net/core/skbuff.c:1139)
[  238.029944][  T318]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
...
[  238.029957][  T318]  ? skb_release_data (net/core/skbuff.c:1139)
[  238.029969][  T318]  kasan_report_invalid_free (mm/kasan/report.c:221 mm/kasan/report.c:563)
[  238.029979][  T318]  ? skb_release_data (net/core/skbuff.c:1139)
[  238.029989][  T318]  check_slab_allocation (mm/kasan/common.c:231)
[  238.029995][  T318]  kmem_cache_free (mm/slub.c:2637 (discriminator 1) mm/slub.c:6168 (discriminator 1) mm/slub.c:6298 (discriminator 1))
[  238.030004][  T318]  skb_release_data (net/core/skbuff.c:1139)
...
[  238.030025][  T318]  sk_skb_reason_drop (net/core/skbuff.c:1256)
[  238.030032][  T318]  pfifo_fast_reset (./include/linux/ptr_ring.h:171 ./include/linux/ptr_ring.h:309 ./include/linux/skb_array.h:98 net/sched/sch_generic.c:827)
[  238.030039][  T318]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
...
[  238.030054][  T318]  qdisc_reset (net/sched/sch_generic.c:1034)
[  238.030062][  T318]  teql_destroy (./include/linux/spinlock.h:395 net/sched/sch_teql.c:157)
[  238.030071][  T318]  __qdisc_destroy (./include/net/pkt_sched.h:328 net/sched/sch_generic.c:1077)
[  238.030077][  T318]  qdisc_graft (net/sched/sch_api.c:1062 net/sched/sch_api.c:1053 net/sched/sch_api.c:1159)
[  238.030089][  T318]  ? __pfx_qdisc_graft (net/sched/sch_api.c:1091)
[  238.030095][  T318]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[  238.030102][  T318]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[  238.030106][  T318]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[  238.030114][  T318]  tc_get_qdisc (net/sched/sch_api.c:1529 net/sched/sch_api.c:1556)
...
[  238.072958][  T318] Allocated by task 303 on cpu 5 at 238.026275s:
[  238.073392][  T318]  kasan_save_stack (mm/kasan/common.c:58)
[  238.073884][  T318]  kasan_save_track (mm/kasan/common.c:64 (discriminator 5) mm/kasan/common.c:79 (discriminator 5))
[  238.074230][  T318]  __kasan_slab_alloc (mm/kasan/common.c:369)
[  238.074578][  T318]  kmem_cache_alloc_node_noprof (./include/linux/kasan.h:253 mm/slub.c:4542 mm/slub.c:4869 mm/slub.c:4921)
[  238.076091][  T318]  kmalloc_reserve (net/core/skbuff.c:616 (discriminator 107))
[  238.076450][  T318]  __alloc_skb (net/core/skbuff.c:713)
[  238.076834][  T318]  alloc_skb_with_frags (./include/linux/skbuff.h:1383 net/core/skbuff.c:6763)
[  238.077178][  T318]  sock_alloc_send_pskb (net/core/sock.c:2997)
[  238.077520][  T318]  packet_sendmsg (net/packet/af_packet.c:2926 net/packet/af_packet.c:3019 net/packet/af_packet.c:3108)
[  238.081469][  T318]
[  238.081870][  T318] Freed by task 299 on cpu 1 at 238.028496s:
[  238.082761][  T318]  kasan_save_stack (mm/kasan/common.c:58)
[  238.083481][  T318]  kasan_save_track (mm/kasan/common.c:64 (discriminator 5) mm/kasan/common.c:79 (discriminator 5))
[  238.085348][  T318]  kasan_save_free_info (mm/kasan/generic.c:587 (discriminator 1))
[  238.085900][  T318]  __kasan_slab_free (mm/
---truncated---
CVSS v3.1 score: 7.8