Out-of-bounds Read in Linux

CVE-2023-52731

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().

Vulnerability class: Buffer Overflow

EPSS: 0.002 (15.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

  • Linux — versions 186b89659c4c67cccead52961eab0ca3b23951dc, 56c134f7f1b58be08bdb0ca8372474a4a5165f31, 5.19
  • Linux Linux_kernel — versions 6.2

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2023-52731?
CVE-2023-52731 is a high-severity vulnerability in Linux, classified under Out-of-bounds Read. CVSS score: 7.8/10. Published 2024-05-21.
How severe is CVE-2023-52731?
High severity. CVSS v3 base score is 7.8 out of 10.