CVE-2024-46849

In the Linux kernel, the following vulnerability has been resolved:

ASoC: meson: axg-card: fix use-after-free

Buffer card->dai_link is reallocated in meson_card_reallocate_links(), so move pad pointer initialization after this function when memory is already reallocated.

Kasan bug report:

================================================================== BUG: KASAN: slab-use-after-free in axg_card_add_link+0x76c/0x9bc Read of size 8 at addr ffff000000e8b260 by task modprobe/356

CPU: 0 PID: 356 Comm: modprobe Tainted: G O 6.9.12-sdkernel #1 Call trace: dump_backtrace+0x94/0xec show_stack+0x18/0x24 dump_stack_lvl+0x78/0x90 print_report+0xfc/0x5c0 kasan_report+0xb8/0xfc __asan_load8+0x9c/0xb8 axg_card_add_link+0x76c/0x9bc [snd_soc_meson_axg_sound_card] meson_card_probe+0x344/0x3b8 [snd_soc_meson_card_utils] platform_probe+0x8c/0xf4 really_probe+0x110/0x39c __driver_probe_device+0xb8/0x18c driver_probe_device+0x108/0x1d8 __driver_attach+0xd0/0x25c bus_for_each_dev+0xe0/0x154 driver_attach+0x34/0x44 bus_add_driver+0x134/0x294 driver_register+0xa8/0x1e8 __platform_driver_register+0x44/0x54 axg_card_pdrv_init+0x20/0x1000 [snd_soc_meson_axg_sound_card] do_one_initcall+0xdc/0x25c do_init_module+0x10c/0x334 load_module+0x24c4/0x26cc init_module_from_file+0xd4/0x128 __arm64_sys_finit_module+0x1f4/0x41c invoke_syscall+0x60/0x188 el0_svc_common.constprop.0+0x78/0x13c do_el0_svc+0x30/0x40 el0_svc+0x38/0x78 el0t_64_sync_handler+0x100/0x12c el0t_64_sync+0x190/0x194

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/4f9a71435953f941969a4f017e2357db62d85a86
• https://git.kernel.org/stable/c/5a2cc2bb81399e9ebc72560541137eb04d61dc3d
• https://git.kernel.org/stable/c/7d318166bf55e9029d56997c3b134f4ac2ae2607
• https://git.kernel.org/stable/c/a33145f494e6cb82f3e018662cc7c4febf271f22
• https://git.kernel.org/stable/c/e1a199ec31617242e1a0ea8f312341e682d0c037
• https://git.kernel.org/stable/c/e43364f578cdc2f8083abbc0cb743ea55e827c29
• https://git.kernel.org/stable/c/fb0530025d502cb79d2b2801b14a9d5261833f1a