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CVE-2024-26724

Description

In the Linux kernel, the following vulnerability has been resolved:net/mlx5: DPLL, Fix possible use after free after delayed work timer triggersI 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] [ 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] [ 2169.729993] [ 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 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: 0000000000000001 RBX: ffff888100d9c200 RCX: ffffffff8241bd62[ 2169.733925] RDX: ffffed109a848b15 RSI: 0000000000000004 RDI: ffffffff8127ac55[ 2169.734566] RBP: 0000000000000004 R08: 0000000000000000 R09: ffffed109a848b14[ 2169.735200] R10: ffff8884d42458a3 R11: 000000000000ba7e R12: ffffffff83d7d3a0[ 2169.735835] R13: 1ffff110201b7fc6 R14: 0000000000000000 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] [ 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---

CVE-2024-26724

Description

POC

Reference

Github