CVE-2023-52497

Medium

In the Linux kernel, the following vulnerability has been resolved: erofs: fix lz4 inplace decompression Currently EROFS can map another compressed buffer for inplace decompression, that was used to handle the cases that some pages of compressed data are actually not in-place I/O. However, like most simple LZ77 algorithms, LZ4 expects the compressed data is arranged at the end of the decompressed buffer and it explicitly uses memmove() to handle overlapping: __________________________________________________________ |_ direction of decompression --> ____ |_ compressed data _| Although EROFS arranges compressed data like this, it typically maps two individual virtual buffers so the relative order is uncertain. Previously, it was hardly observed since LZ4 only uses memmove() for short overlapped literals and x86/arm64 memmove implementations seem to completely cover it up and they don't have this issue. Juhyung reported that EROFS data corruption can be found on a new Intel x86 processor. After some analysis, it seems that recent x86 processors with the new FSRM feature expose this issue with "rep movsb". Let's strictly use the decompressed buffer for lz4 inplace decompression for now. Later, as an useful improvement, we could try to tie up these two buffers together in the correct order.

Package Linux Kernel
Published 2024-03-01
Last modified 2025-01-09
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

6.1

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Weakness type

CWE-787

CVE-2023-52497 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

The product writes data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.3 and later are affected. Fixed in 5.4.285, 5.10.211, 5.15.150, 6.1.76, 6.6.15, 6.7.3, 6.8 and their respective stable series.

Affected from
≥ 5.3
Fixed in
✓ 5.4.285 5.4.x ✓ 5.10.211 5.10.x ✓ 5.15.150 5.15.x ✓ 6.1.76 6.1.x ✓ 6.6.15 6.6.x ✓ 6.7.3 6.7.x ✓ 6.8

References

8 total
Showing 5 of 8 references View all on NVD

Frequently asked questions

  • What is CVE-2023-52497?

    CVE-2023-52497 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.1 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . It affects Linux kernel versions from 5.3 onward and has been patched in 5.4.285, 5.10.211, 5.15.150 and others. CVE-2023-52497 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2023-52497?

    CVE-2023-52497 has a CVSS score of 6.1 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H .

  • Is there a patch available for CVE-2023-52497?

    Yes. CVE-2023-52497 has been patched. Fixed versions include 5.4.285, 5.10.211, 5.15.150 and others. If you are running Linux kernel 5.3 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2023-52497 actively exploited?

    No. CVE-2023-52497 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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