{"id":"AZL-52514","summary":"CVE-2024-50126 affecting package kernel for versions less than 6.6.64.2-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: use RCU read-side critical section in taprio_dump()\n\nFix possible use-after-free in 'taprio_dump()' by adding RCU\nread-side critical section there. Never seen on x86 but\nfound on a KASAN-enabled arm64 system when investigating\nhttps://syzkaller.appspot.com/bug?extid=b65e0af58423fc8a73aa:\n\n[T15862] BUG: KASAN: slab-use-after-free in taprio_dump+0xa0c/0xbb0\n[T15862] Read of size 4 at addr ffff0000d4bb88f8 by task repro/15862\n[T15862]\n[T15862] CPU: 0 UID: 0 PID: 15862 Comm: repro Not tainted 6.11.0-rc1-00293-gdefaf1a2113a-dirty #2\n[T15862] Hardware name: QEMU QEMU Virtual Machine, BIOS edk2-20240524-5.fc40 05/24/2024\n[T15862] Call trace:\n[T15862]  dump_backtrace+0x20c/0x220\n[T15862]  show_stack+0x2c/0x40\n[T15862]  dump_stack_lvl+0xf8/0x174\n[T15862]  print_report+0x170/0x4d8\n[T15862]  kasan_report+0xb8/0x1d4\n[T15862]  __asan_report_load4_noabort+0x20/0x2c\n[T15862]  taprio_dump+0xa0c/0xbb0\n[T15862]  tc_fill_qdisc+0x540/0x1020\n[T15862]  qdisc_notify.isra.0+0x330/0x3a0\n[T15862]  tc_modify_qdisc+0x7b8/0x1838\n[T15862]  rtnetlink_rcv_msg+0x3c8/0xc20\n[T15862]  netlink_rcv_skb+0x1f8/0x3d4\n[T15862]  rtnetlink_rcv+0x28/0x40\n[T15862]  netlink_unicast+0x51c/0x790\n[T15862]  netlink_sendmsg+0x79c/0xc20\n[T15862]  __sock_sendmsg+0xe0/0x1a0\n[T15862]  ____sys_sendmsg+0x6c0/0x840\n[T15862]  ___sys_sendmsg+0x1ac/0x1f0\n[T15862]  __sys_sendmsg+0x110/0x1d0\n[T15862]  __arm64_sys_sendmsg+0x74/0xb0\n[T15862]  invoke_syscall+0x88/0x2e0\n[T15862]  el0_svc_common.constprop.0+0xe4/0x2a0\n[T15862]  do_el0_svc+0x44/0x60\n[T15862]  el0_svc+0x50/0x184\n[T15862]  el0t_64_sync_handler+0x120/0x12c\n[T15862]  el0t_64_sync+0x190/0x194\n[T15862]\n[T15862] Allocated by task 15857:\n[T15862]  kasan_save_stack+0x3c/0x70\n[T15862]  kasan_save_track+0x20/0x3c\n[T15862]  kasan_save_alloc_info+0x40/0x60\n[T15862]  __kasan_kmalloc+0xd4/0xe0\n[T15862]  __kmalloc_cache_noprof+0x194/0x334\n[T15862]  taprio_change+0x45c/0x2fe0\n[T15862]  tc_modify_qdisc+0x6a8/0x1838\n[T15862]  rtnetlink_rcv_msg+0x3c8/0xc20\n[T15862]  netlink_rcv_skb+0x1f8/0x3d4\n[T15862]  rtnetlink_rcv+0x28/0x40\n[T15862]  netlink_unicast+0x51c/0x790\n[T15862]  netlink_sendmsg+0x79c/0xc20\n[T15862]  __sock_sendmsg+0xe0/0x1a0\n[T15862]  ____sys_sendmsg+0x6c0/0x840\n[T15862]  ___sys_sendmsg+0x1ac/0x1f0\n[T15862]  __sys_sendmsg+0x110/0x1d0\n[T15862]  __arm64_sys_sendmsg+0x74/0xb0\n[T15862]  invoke_syscall+0x88/0x2e0\n[T15862]  el0_svc_common.constprop.0+0xe4/0x2a0\n[T15862]  do_el0_svc+0x44/0x60\n[T15862]  el0_svc+0x50/0x184\n[T15862]  el0t_64_sync_handler+0x120/0x12c\n[T15862]  el0t_64_sync+0x190/0x194\n[T15862]\n[T15862] Freed by task 6192:\n[T15862]  kasan_save_stack+0x3c/0x70\n[T15862]  kasan_save_track+0x20/0x3c\n[T15862]  kasan_save_free_info+0x4c/0x80\n[T15862]  poison_slab_object+0x110/0x160\n[T15862]  __kasan_slab_free+0x3c/0x74\n[T15862]  kfree+0x134/0x3c0\n[T15862]  taprio_free_sched_cb+0x18c/0x220\n[T15862]  rcu_core+0x920/0x1b7c\n[T15862]  rcu_core_si+0x10/0x1c\n[T15862]  handle_softirqs+0x2e8/0xd64\n[T15862]  __do_softirq+0x14/0x20","modified":"2026-04-01T05:16:30.441498Z","published":"2024-11-05T18:15:15Z","upstream":["CVE-2024-50126"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-50126"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.64.2-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-52514.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}