CVE-2026-23449

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net/sched: teql: Fix double-free in teql_master_xmit<br /> <br /> Whenever a TEQL devices has a lockless Qdisc as root, qdisc_reset should<br /> be called using the seq_lock to avoid racing with the datapath. Failure<br /> to do so may cause crashes like the following:<br /> <br /> [ 238.028993][ T318] BUG: KASAN: double-free in skb_release_data (net/core/skbuff.c:1139)<br /> [ 238.029328][ T318] Free of addr ffff88810c67ec00 by task poc_teql_uaf_ke/318<br /> [ 238.029749][ T318]<br /> [ 238.029900][ T318] CPU: 3 UID: 0 PID: 318 Comm: poc_teql_ke Not tainted 7.0.0-rc3-00149-ge5b31d988a41 #704 PREEMPT(full)<br /> [ 238.029906][ T318] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011<br /> [ 238.029910][ T318] Call Trace:<br /> [ 238.029913][ T318] <br /> [ 238.029916][ T318] dump_stack_lvl (lib/dump_stack.c:122)<br /> [ 238.029928][ T318] print_report (mm/kasan/report.c:379 mm/kasan/report.c:482)<br /> [ 238.029940][ T318] ? skb_release_data (net/core/skbuff.c:1139)<br /> [ 238.029944][ T318] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)<br /> ...<br /> [ 238.029957][ T318] ? skb_release_data (net/core/skbuff.c:1139)<br /> [ 238.029969][ T318] kasan_report_invalid_free (mm/kasan/report.c:221 mm/kasan/report.c:563)<br /> [ 238.029979][ T318] ? skb_release_data (net/core/skbuff.c:1139)<br /> [ 238.029989][ T318] check_slab_allocation (mm/kasan/common.c:231)<br /> [ 238.029995][ T318] kmem_cache_free (mm/slub.c:2637 (discriminator 1) mm/slub.c:6168 (discriminator 1) mm/slub.c:6298 (discriminator 1))<br /> [ 238.030004][ T318] skb_release_data (net/core/skbuff.c:1139)<br /> ...<br /> [ 238.030025][ T318] sk_skb_reason_drop (net/core/skbuff.c:1256)<br /> [ 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)<br /> [ 238.030039][ T318] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)<br /> ...<br /> [ 238.030054][ T318] qdisc_reset (net/sched/sch_generic.c:1034)<br /> [ 238.030062][ T318] teql_destroy (./include/linux/spinlock.h:395 net/sched/sch_teql.c:157)<br /> [ 238.030071][ T318] __qdisc_destroy (./include/net/pkt_sched.h:328 net/sched/sch_generic.c:1077)<br /> [ 238.030077][ T318] qdisc_graft (net/sched/sch_api.c:1062 net/sched/sch_api.c:1053 net/sched/sch_api.c:1159)<br /> [ 238.030089][ T318] ? __pfx_qdisc_graft (net/sched/sch_api.c:1091)<br /> [ 238.030095][ T318] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)<br /> [ 238.030102][ T318] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)<br /> [ 238.030106][ T318] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)<br /> [ 238.030114][ T318] tc_get_qdisc (net/sched/sch_api.c:1529 net/sched/sch_api.c:1556)<br /> ...<br /> [ 238.072958][ T318] Allocated by task 303 on cpu 5 at 238.026275s:<br /> [ 238.073392][ T318] kasan_save_stack (mm/kasan/common.c:58)<br /> [ 238.073884][ T318] kasan_save_track (mm/kasan/common.c:64 (discriminator 5) mm/kasan/common.c:79 (discriminator 5))<br /> [ 238.074230][ T318] __kasan_slab_alloc (mm/kasan/common.c:369)<br /> [ 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)<br /> [ 238.076091][ T318] kmalloc_reserve (net/core/skbuff.c:616 (discriminator 107))<br /> [ 238.076450][ T318] __alloc_skb (net/core/skbuff.c:713)<br /> [ 238.076834][ T318] alloc_skb_with_frags (./include/linux/skbuff.h:1383 net/core/skbuff.c:6763)<br /> [ 238.077178][ T318] sock_alloc_send_pskb (net/core/sock.c:2997)<br /> [ 238.077520][ T318] packet_sendmsg (net/packet/af_packet.c:2926 net/packet/af_packet.c:3019 net/packet/af_packet.c:3108)<br /> [ 238.081469][ T318]<br /> [ 238.081870][ T318] Freed by task 299 on cpu 1 at 238.028496s:<br /> [ 238.082761][ T318] kasan_save_stack (mm/kasan/common.c:58)<br /> [ 238.083481][ T318] kasan_save_track (mm/kasan/common.c:64 (discriminator 5) mm/kasan/common.c:79 (discriminator 5))<br /> [ 238.085348][ T318] kasan_save_free_info (mm/kasan/generic.c:587 (discriminator 1))<br /> [ 238.085900][ T318] __kasan_slab_free (mm/<br /> ---truncated---