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🛡️ CVE-2024-49924 — debian-linux

🟠 CVSS 7.8 — High ✅ No Known Exploit CWE-416 NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

fbdev: pxafb: Fix possible use after free in pxafb_task()

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2024-49924 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.

Affected software

CVE-2024-49924 is recorded against 3 packages.

  • debian-linux
  • kernel (from 6.11.0 up to 6.11.3)
  • linux-kernel (from 6.11 up to 6.11.3)

Timeline and source

Published on 21 October 2024 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
lists.debian.org

Other advisories for this package

debian-linux has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-416: Use After Free) in other software:

CVE-2024-49924 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-416
Public Exploit ✅ No
Source NVD
Published 2024-10-21
Updated 2026-08-20
Modified 2026-08-04

Affected Packages

Software From version Fixed in
debian-linux — —
kernel 6.11.0 6.11.3
linux-kernel 6.11 6.11.3

References

Similar Threats

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