Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 9f17f2874834f4cdbe48cc05676d8f7558793204 before e657fa2df4429f3805a9b3e47fb1a4a1b02a72bd; affected 9f17f2874834f4cdbe48cc05676d8f7558793204 before 6d0a07f68b66269e167def6c0b90a219cd3e7473; affected 9f17f2874834f4cdbe48cc05676d8f7558793204 before e6897e299f57b103e999e62010b88e363b3eebae; affected 9f17f2874834f4cdbe48cc05676d8f7558793204 before 4cda484e584be34d55ee17436ebf7ad11922b97a; affected 9f17f2874834f4cdbe48cc05676d8f7558793204 before 3c0d416eb4bef705f699213cee94bf54b6acdacd; affected 9f17f2874834f4cdbe48cc05676d8f7558793204 before fdda354f60a576d52dcf90351254714681df4370; affected 9f17f2874834f4cdbe48cc05676d8f7558793204 before aaadc0cb05c999ccd8898a03298b7e5c31509b08; affected 9f17f2874834f4cdbe48cc05676d8f7558793204 before a3a855764dbacbdb1cc51e15dc588f2d21c93e0e; affected 9f17f2874834f4cdbe48cc05676d8f7558793204 before 4a6921095eb04a900e0000da83d9475eb958e61e |
| Linux / Linux | affected 2.6.27; unaffected 0 before 2.6.27; unaffected 4.19.323 through 4.19.*; unaffected 5.4.285 through 5.4.*; unaffected 5.10.227 through 5.10.*; unaffected 5.15.168 through 5.15.*; unaffected 6.1.113 through 6.1.*; unaffected 6.6.55 through 6.6.*; unaffected 6.10.14 through 6.10.*; unaffected 6.11.3 through 6.11.*; unaffected 6.12 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/e657fa2df4429f3805a9b3e47fb1a4a1b02a72bd
- https://git.kernel.org/stable/c/6d0a07f68b66269e167def6c0b90a219cd3e7473
- https://git.kernel.org/stable/c/e6897e299f57b103e999e62010b88e363b3eebae
- https://git.kernel.org/stable/c/4cda484e584be34d55ee17436ebf7ad11922b97a
- https://git.kernel.org/stable/c/3c0d416eb4bef705f699213cee94bf54b6acdacd
- https://git.kernel.org/stable/c/fdda354f60a576d52dcf90351254714681df4370
- https://git.kernel.org/stable/c/aaadc0cb05c999ccd8898a03298b7e5c31509b08
- https://git.kernel.org/stable/c/a3a855764dbacbdb1cc51e15dc588f2d21c93e0e
- https://git.kernel.org/stable/c/4a6921095eb04a900e0000da83d9475eb958e61e
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.