Tracker / CVE-2024-49924
CVE-2024-49924
In the Linux kernel, the following vulnerability has been resolved: fbdev: pxafb: Fix possible use after free in pxafb_task() In the pxafb_probe function, it calls the pxafb_init_fbinfo function, after which &fbi->task is associated with pxafb_task. Moreover, within this pxafb_init_fbinfo function, the pxafb_blank function within the &pxafb_ops struct is capable of scheduling work. If we remove the module which will call pxafb_remove to make cleanup, it will call unregister_framebuffer function which can call do_unregister_framebuffer to free fbi->fb through put_fb_info(fb_info), while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | pxafb_task pxafb_remove | unregister_framebuffer(info) | do_unregister_framebuffer(fb_info) | put_fb_info(fb_info) | // free fbi->fb | set_ctrlr_state(fbi, state) | __pxafb_lcd_power(fbi, 0) | fbi->lcd_power(on, &fbi->fb.var) | //use fbi->fb Fix it by ensuring that the work is canceled before proceeding with the cleanup in pxafb_remove. Note that only root user can remove the driver at runtime.
Prodotti e versioni affette
| debian | debian_linux |
|---|---|
| linux | linux_kernel · 2.6.27 → 4.19.323 |
| linux | linux_kernel · 4.20 → 5.4.285 |
| linux | linux_kernel · 5.11 → 5.15.168 |
| linux | linux_kernel · 5.16 → 6.1.113 |
| linux | linux_kernel · 5.5 → 5.10.227 |
| linux | linux_kernel · 6.11 → 6.11.3 |
| linux | linux_kernel · 6.2 → 6.6.55 |
| linux | linux_kernel · 6.7 → 6.10.14 |