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CVE-2023-52731

fbdev: Fix invalid page access after closing deferred I/O devices

HIGH
7.8
CVSS Score
Published: May 21, 2024 at 03:22 PM UTC
Updated: August 5, 2026 at 10:24 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: fbdev: Fix invalid page access after closing deferred I/O devices When a fbdev with deferred I/O is once opened and closed, the dirty pages still remain queued in the pageref list, and eventually later those may be processed in the delayed work. This may lead to a corruption of pages, hitting an Oops. This patch makes sure to cancel the delayed work and clean up the pageref list at closing the device for addressing the bug. A part of the cleanup code is factored out as a new helper function that is called from the common fb_release().

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.19 ≤ v < 6.1.135.19 ≤ v < 6.2186b89659c4c67cccead52961eab0ca3b23951dc56c134f7f1b58be08bdb0ca8372474a4a5165f316.2 rc16.2 rc26.2 rc36.2 rc46.2 rc56.2 rc66.2 rc76.2 rc8
Vendor states this is fixed in 3efc61d95259956db25347e2a9562c3e54546e20 (fixed)
Vendor states this is fixed in 87b9802ca824fcee7915e717e9a60471af62e8e9 (fixed)
Vendor states this is fixed in f1d91f0e9d5a240a809698d7d9c5a538e7dcc149 (fixed)
Vendor states this is fixed in 5.19 (unaffected)
Vendor states this is fixed in 6.1.13 (unaffected)
Vendor states this is fixed in 6.2 (unaffected)

References (3)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/3efc61d95259956db25347e2a9562c3e54546e20
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/87b9802ca824fcee7915e717e9a60471af62e8e9
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/f1d91f0e9d5a240a809698d7d9c5a538e7dcc149

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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