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.
Metrics
Affected Vendors & Products
| Vendors | Products |
|---|---|
| Linux |
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Configuration 1 [-]
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Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Wed, 16 Jul 2025 13:45:00 +0000
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epss
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epss
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Fri, 08 Nov 2024 16:00:00 +0000
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Fri, 25 Oct 2024 15:45:00 +0000
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| First Time appeared |
Linux
Linux linux Kernel |
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| Weaknesses | CWE-416 | |
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
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cvssV3_1
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cvssV3_1
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Wed, 23 Oct 2024 01:30:00 +0000
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cvssV3_1
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Tue, 22 Oct 2024 14:15:00 +0000
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ssvc
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Mon, 21 Oct 2024 18:15:00 +0000
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| Description | 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. | |
| Title | fbdev: pxafb: Fix possible use after free in pxafb_task() | |
| References |
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2025-05-04T09:41:22.913Z
Reserved: 2024-10-21T12:17:06.036Z
Link: CVE-2024-49924
Vulnrichment
Updated: 2024-10-22T13:40:00.525Z
NVD
Status : Modified
Published: 2024-10-21T18:15:14.450
Modified: 2024-11-08T16:15:31.683
Link: CVE-2024-49924
Redhat
OpenCVE Enrichment
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