CVE-2024-49924: fbdev: pxafb: Fix possible use after free in pxafb_task()
First published: Mon Oct 21 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <5.10.227 | |
| Linux Kernel | >=5.11<5.15.168 | |
| Linux Kernel | >=5.16<6.1.113 | |
| Linux Kernel | >=6.2<6.6.55 | |
| Linux Kernel | >=6.7<6.10.14 | |
| Linux Kernel | >=6.11<6.11.3 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/3c0d416eb4bef705f699213cee94bf54b6acdacd
- https://git.kernel.org/stable/c/4a6921095eb04a900e0000da83d9475eb958e61e
- https://git.kernel.org/stable/c/4cda484e584be34d55ee17436ebf7ad11922b97a
- https://git.kernel.org/stable/c/6d0a07f68b66269e167def6c0b90a219cd3e7473
- https://git.kernel.org/stable/c/a3a855764dbacbdb1cc51e15dc588f2d21c93e0e
- https://git.kernel.org/stable/c/aaadc0cb05c999ccd8898a03298b7e5c31509b08
- https://git.kernel.org/stable/c/e657fa2df4429f3805a9b3e47fb1a4a1b02a72bd
- https://git.kernel.org/stable/c/e6897e299f57b103e999e62010b88e363b3eebae
- https://git.kernel.org/stable/c/fdda354f60a576d52dcf90351254714681df4370
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49924
- https://nvd.nist.gov/vuln/detail/CVE-2024-49924
- https://launchpad.net/bugs/cve/CVE-2024-49924
- https://security-tracker.debian.org/tracker/CVE-2024-49924
- https://ubuntu.com/security/CVE-2024-49924
- https://git.kernel.org/linus/4a6921095eb04a900e0000da83d9475eb958e61e
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