{"id":"DEBIAN-CVE-2024-50126","details":"In the Linux kernel, the following vulnerability has been resolved:  net: sched: use RCU read-side critical section in taprio_dump()  Fix possible use-after-free in 'taprio_dump()' by adding RCU read-side critical section there. Never seen on x86 but found on a KASAN-enabled arm64 system when investigating https://syzkaller.appspot.com/bug?extid=b65e0af58423fc8a73aa:  [T15862] BUG: KASAN: slab-use-after-free in taprio_dump+0xa0c/0xbb0 [T15862] Read of size 4 at addr ffff0000d4bb88f8 by task repro/15862 [T15862] [T15862] CPU: 0 UID: 0 PID: 15862 Comm: repro Not tainted 6.11.0-rc1-00293-gdefaf1a2113a-dirty #2 [T15862] Hardware name: QEMU QEMU Virtual Machine, BIOS edk2-20240524-5.fc40 05/24/2024 [T15862] Call trace: [T15862]  dump_backtrace+0x20c/0x220 [T15862]  show_stack+0x2c/0x40 [T15862]  dump_stack_lvl+0xf8/0x174 [T15862]  print_report+0x170/0x4d8 [T15862]  kasan_report+0xb8/0x1d4 [T15862]  __asan_report_load4_noabort+0x20/0x2c [T15862]  taprio_dump+0xa0c/0xbb0 [T15862]  tc_fill_qdisc+0x540/0x1020 [T15862]  qdisc_notify.isra.0+0x330/0x3a0 [T15862]  tc_modify_qdisc+0x7b8/0x1838 [T15862]  rtnetlink_rcv_msg+0x3c8/0xc20 [T15862]  netlink_rcv_skb+0x1f8/0x3d4 [T15862]  rtnetlink_rcv+0x28/0x40 [T15862]  netlink_unicast+0x51c/0x790 [T15862]  netlink_sendmsg+0x79c/0xc20 [T15862]  __sock_sendmsg+0xe0/0x1a0 [T15862]  ____sys_sendmsg+0x6c0/0x840 [T15862]  ___sys_sendmsg+0x1ac/0x1f0 [T15862]  __sys_sendmsg+0x110/0x1d0 [T15862]  __arm64_sys_sendmsg+0x74/0xb0 [T15862]  invoke_syscall+0x88/0x2e0 [T15862]  el0_svc_common.constprop.0+0xe4/0x2a0 [T15862]  do_el0_svc+0x44/0x60 [T15862]  el0_svc+0x50/0x184 [T15862]  el0t_64_sync_handler+0x120/0x12c [T15862]  el0t_64_sync+0x190/0x194 [T15862] [T15862] Allocated by task 15857: [T15862]  kasan_save_stack+0x3c/0x70 [T15862]  kasan_save_track+0x20/0x3c [T15862]  kasan_save_alloc_info+0x40/0x60 [T15862]  __kasan_kmalloc+0xd4/0xe0 [T15862]  __kmalloc_cache_noprof+0x194/0x334 [T15862]  taprio_change+0x45c/0x2fe0 [T15862]  tc_modify_qdisc+0x6a8/0x1838 [T15862]  rtnetlink_rcv_msg+0x3c8/0xc20 [T15862]  netlink_rcv_skb+0x1f8/0x3d4 [T15862]  rtnetlink_rcv+0x28/0x40 [T15862]  netlink_unicast+0x51c/0x790 [T15862]  netlink_sendmsg+0x79c/0xc20 [T15862]  __sock_sendmsg+0xe0/0x1a0 [T15862]  ____sys_sendmsg+0x6c0/0x840 [T15862]  ___sys_sendmsg+0x1ac/0x1f0 [T15862]  __sys_sendmsg+0x110/0x1d0 [T15862]  __arm64_sys_sendmsg+0x74/0xb0 [T15862]  invoke_syscall+0x88/0x2e0 [T15862]  el0_svc_common.constprop.0+0xe4/0x2a0 [T15862]  do_el0_svc+0x44/0x60 [T15862]  el0_svc+0x50/0x184 [T15862]  el0t_64_sync_handler+0x120/0x12c [T15862]  el0t_64_sync+0x190/0x194 [T15862] [T15862] Freed by task 6192: [T15862]  kasan_save_stack+0x3c/0x70 [T15862]  kasan_save_track+0x20/0x3c [T15862]  kasan_save_free_info+0x4c/0x80 [T15862]  poison_slab_object+0x110/0x160 [T15862]  __kasan_slab_free+0x3c/0x74 [T15862]  kfree+0x134/0x3c0 [T15862]  taprio_free_sched_cb+0x18c/0x220 [T15862]  rcu_core+0x920/0x1b7c [T15862]  rcu_core_si+0x10/0x1c [T15862]  handle_softirqs+0x2e8/0xd64 [T15862]  __do_softirq+0x14/0x20","modified":"2026-09-15T09:02:59.087023551Z","published":"2024-11-05T18:15:15.607Z","upstream":["CVE-2024-50126"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-50126"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.119-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-50126.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-50126.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-50126.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}