CVE: CVE-2024-26724
Published: 2024-04-03
Description: In the Linux kernel, the following vulnerability has been resolved:

net/mlx5: DPLL, Fix possible use after free after delayed work timer triggers

I managed to hit following use after free warning recently:

[ 2169.711665] ==================================================================
[ 2169.714009] BUG: KASAN: slab-use-after-free in __run_timers.part.0+0x179/0x4c0
[ 2169.716293] Write of size 8 at addr ffff88812b326a70 by task swapper/4/0

[ 2169.719022] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 6.8.0-rc2jiri+ #2
[ 2169.720974] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[ 2169.722457] Call Trace:
[ 2169.722756]  <IRQ>
[ 2169.723024]  dump_stack_lvl+0x58/0xb0
[ 2169.723417]  print_report+0xc5/0x630
[ 2169.723807]  ? __virt_addr_valid+0x126/0x2b0
[ 2169.724268]  kasan_report+0xbe/0xf0
[ 2169.724667]  ? __run_timers.part.0+0x179/0x4c0
[ 2169.725116]  ? __run_timers.part.0+0x179/0x4c0
[ 2169.725570]  __run_timers.part.0+0x179/0x4c0
[ 2169.726003]  ? call_timer_fn+0x320/0x320
[ 2169.726404]  ? lock_downgrade+0x3a0/0x3a0
[ 2169.726820]  ? kvm_clock_get_cycles+0x14/0x20
[ 2169.727257]  ? ktime_get+0x92/0x150
[ 2169.727630]  ? lapic_next_deadline+0x35/0x60
[ 2169.728069]  run_timer_softirq+0x40/0x80
[ 2169.728475]  __do_softirq+0x1a1/0x509
[ 2169.728866]  irq_exit_rcu+0x95/0xc0
[ 2169.729241]  sysvec_apic_timer_interrupt+0x6b/0x80
[ 2169.729718]  </IRQ>
[ 2169.729993]  <TASK>
[ 2169.730259]  asm_sysvec_apic_timer_interrupt+0x16/0x20
[ 2169.730755] RIP: 0010:default_idle+0x13/0x20
[ 2169.731190] Code: c0 08 00 00 00 4d 29 c8 4c 01 c7 4c 29 c2 e9 72 ff ff ff cc cc cc cc 8b 05 9a 7f 1f 02 85 c0 7e 07 0f 00 2d cf 69 43 00 fb f4 <fa> c3 66 66 2e 0f 1f 84 00 00 00 00 00 65 48 8b 04 25 c0 93 04 00
[ 2169.732759] RSP: 0018:ffff888100dbfe10 EFLAGS: 00000242
[ 2169.733264] RAX: [PII_REDACTED] RBX: ffff888100d9c200 RCX: ffffffff8241bd62
[ 2169.733925] RDX: ffffed109a848b15 RSI: [PII_REDACTED] RDI: ffffffff8127ac55
[ 2169.734566] RBP: [PII_REDACTED] R08: [PII_REDACTED] R09: ffffed109a848b14
[ 2169.735200] R10: ffff8884d42458a3 R11:[PII_REDACTED]00ba7e R12: ffffffff83d7d3a0
[ 2169.735835] R13: 1ffff110201b7fc6 R14: [PII_REDACTED] R15: ffff888100d9c200
[ 2169.736478]  ? ct_kernel_exit.constprop.0+0xa2/0xc0
[ 2169.736954]  ? do_idle+0x285/0x290
[ 2169.737323]  default_idle_call+0x63/0x90
[ 2169.737730]  do_idle+0x285/0x290
[ 2169.738089]  ? arch_cpu_idle_exit+0x30/0x30
[ 2169.738511]  ? mark_held_locks+0x1a/0x80
[ 2169.738917]  ? lockdep_hardirqs_on_prepare+0x12e/0x200
[ 2169.739417]  cpu_startup_entry+0x30/0x40
[ 2169.739825]  start_secondary+0x19a/0x1c0
[ 2169.740229]  ? set_cpu_sibling_map+0xbd0/0xbd0
[ 2169.740673]  secondary_startup_64_no_verify+0x15d/0x16b
[ 2169.741179]  </TASK>

[ 2169.741686] Allocated by task 1098:
[ 2169.742058]  kasan_save_stack+0x1c/0x40
[ 2169.742456]  kasan_save_track+0x10/0x30
[ 2169.742852]  __kasan_kmalloc+0x83/0x90
[ 2169.743246]  mlx5_dpll_probe+0xf5/0x3c0 [mlx5_dpll]
[ 2169.743730]  auxiliary_bus_probe+0x62/0xb0
[ 2169.744148]  really_probe+0x127/0x590
[ 2169.744534]  __driver_probe_device+0xd2/0x200
[ 2169.744973]  device_driver_attach+0x6b/0xf0
[ 2169.745402]  bind_store+0x90/0xe0
[ 2169.745761]  kernfs_fop_write_iter+0x1df/0x2a0
[ 2169.746210]  vfs_write+0x41f/0x790
[ 2169.746579]  ksys_write+0xc7/0x160
[ 2169.746947]  do_syscall_64+0x6f/0x140
[ 2169.747333]  entry_SYSCALL_64_after_hwframe+0x46/0x4e

[ 2169.748049] Freed by task 1220:
[ 2169.748393]  kasan_save_stack+0x1c/0x40
[ 2169.748789]  kasan_save_track+0x10/0x30
[ 2169.749188]  kasan_save_free_info+0x3b/0x50
[ 2169.749621]  poison_slab_object+0x106/0x180
[ 2169.750044]  __kasan_slab_free+0x14/0x50
[ 2169.750451]  kfree+0x118/0x330
[ 2169.750792]  mlx5_dpll_remove+0xf5/0x110 [mlx5_dpll]
[ 2169.751271]  auxiliary_bus_remove+0x2e/0x40
[ 2169.751694]  device_release_driver_internal+0x24b/0x2e0
[ 2169.752191]  unbind_store+0xa6/0xb0
[ 2169.752563]  kernfs_fo
---truncated---
CVSS Score: 7.8 (HIGH)
CWE: CWE-416
References: https://git.kernel.org/stable/c/1596126ea50228f0ed96697bae4e9368fda02c56; https://git.kernel.org/stable/c/aa1eec2f546f2afa8c98ec41e5d8ee488165d685; https://git.kernel.org/stable/c/1596126ea50228f0ed96697bae4e9368fda02c56