CVE-2026-43232

Schwachstellenklasse

In the Linux kernel, the following vulnerability has been resolved: net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets When the FarSync T-series card is being detached, the fst_card_info is deallocated in fst_remove_one(). However, the fst_tx_task or fst_int_task may still be running or pending, leading to use-after-free bugs when the already freed fst_card_info is accessed in fst_process_tx_work_q() or fst_process_int_work_q(). A typical race condition is depicted below: CPU 0 (cleanup) | CPU 1 (tasklet) | fst_start_xmit() fst_remove_one() | tasklet_schedule() unregister_hdlc_device()| | fst_process_tx_work_q() //handler kfree(card) //free | do_bottom_half_tx() | card-> //use The following KASAN trace was captured: ================================================================== BUG: KASAN: slab-use-after-free in do_bottom_half_tx+0xb88/0xd00 Read of size 4 at addr ffff88800aad101c by task ksoftirqd/3/32 ... Call Trace: <IRQ> dump_stack_lvl+0x55/0x70 print_report+0xcb/0x5d0 ? do_bottom_half_tx+0xb88/0xd00 kasan_report+0xb8/0xf0 ? do_bottom_half_tx+0xb88/0xd00 do_bottom_half_tx+0xb88/0xd00 ? _raw_spin_lock_irqsave+0x85/0xe0 ? __pfx__raw_spin_lock_irqsave+0x1

Betroffene Produkte

• linux linux_kernel

Quellen

• https://git.kernel.org/stable/c/04edfdfdfcdefc02408ab670607261b0a0a9a02e
• https://git.kernel.org/stable/c/086131807d119238cd464e5b0845e48d938dfd79
• https://git.kernel.org/stable/c/200bdb8d367ca9b478f9c56ebe56411604d55c81
• https://git.kernel.org/stable/c/21d341fe514fd07e345ed264c9eee21cb2061ca2
• https://git.kernel.org/stable/c/337d7b4112a47984ee319171b75b73bab47e7924
• https://git.kernel.org/stable/c/ae894e47e1cd5a6bf8a0423d888c45df8b2b02dc