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CVE-2023-52501 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Do not attempt to read past "commit" When iterating over the ring buffer while the ring buffer is active, the writer can corrupt the reader. There's barriers to help detect this and handle it, but that code missed the case where the last event was at the very end of the page and has only 4 bytes left. The checks to detect the corruption by the writer to reads needs to see the length of the event. If the length in the first 4 bytes is zero then the length is stored in the second 4 bytes. But if the writer is in the process of updating that code, there's a small window where the length in the first 4 bytes could be zero even though the length is only 4 bytes. That will cause rb_event_length() to read the next 4 bytes which could happen to be off the allocated page. To protect against this, fail immediately if the next event pointer is less than 8 bytes from the end of the commit (last byte of data), as all events must be a minimum of 8 bytes anyway.


Severity



CVSS 4.0 Severity and Metrics:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.


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Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/344f2f3e61a90f0150c754796ec9a17fcaeec03d
https://git.kernel.org/stable/c/75fc9e99b3a71006720ad1e029db11a4b5c32d4a
https://git.kernel.org/stable/c/95a404bd60af6c4d9d8db01ad14fe8957ece31ca
https://git.kernel.org/stable/c/b08a4938229dbb530a35c41b83002a1457c6ff49
https://git.kernel.org/stable/c/cee5151c5410e868826b8afecfb356f3799ebea3

Weakness Enumeration

CWE-ID CWE Name Source

Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2023-52501
NVD Published Date:
03/02/2024
NVD Last Modified:
03/04/2024
Source:
kernel.org