CVE-2023-52497: erofs: fix lz4 inplace decompression
First published: Thu Feb 29 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.3<5.4.285 | |
| Linux Kernel | >=5.5<5.10.211 | |
| Linux Kernel | >=5.11<5.15.150 | |
| Linux Kernel | >=5.16<6.1.76 | |
| Linux Kernel | >=6.2<6.6.15 | |
| Linux Kernel | >=6.7<6.7.3 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
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Reference Links
- https://git.kernel.org/stable/c/33bf23c9940dbd3a22aad7f0cda4c84ed5701847
- https://git.kernel.org/stable/c/3c12466b6b7bf1e56f9b32c366a3d83d87afb4de
- https://git.kernel.org/stable/c/77cbc04a1a8610e303a0e0d74f2676667876a184
- https://git.kernel.org/stable/c/a0180e940cf1aefa7d516e20b259ad34f7a8b379
- https://git.kernel.org/stable/c/bffc4cc334c5bb31ded54bc3cfd651735a3cb79e
- https://git.kernel.org/stable/c/f36d200a80a3ca025532ed60dd1ac21b620e14ae
- https://launchpad.net/bugs/cve/CVE-2023-52497
- https://git.kernel.org/stable/c/9ff2d260b25df6fe1341a79113d88fecf6bd553e
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-52497
- https://nvd.nist.gov/vuln/detail/CVE-2023-52497
- https://security-tracker.debian.org/tracker/CVE-2023-52497
- https://ubuntu.com/security/CVE-2023-52497
- https://git.kernel.org/linus/3c12466b6b7bf1e56f9b32c366a3d83d87afb4de
Frequently Asked Questions
What is the severity of CVE-2023-52497?
The severity of CVE-2023-52497 is typically classified as medium due to its potential impact on data integrity.
How do I fix CVE-2023-52497?
To fix CVE-2023-52497, it is recommended to update to the latest kernel versions such as 5.10.223-1, 6.1.123-1, or newer versions provided by your Linux distribution.
What Linux kernel versions are affected by CVE-2023-52497?
CVE-2023-52497 affects Linux kernel versions between 5.3 and 6.7.3, including specific versions outlined in the vulnerability report.
What are the consequences of not addressing CVE-2023-52497?
Failing to address CVE-2023-52497 may lead to vulnerabilities in EROFS that can be exploited, potentially affecting system stability and data integrity.
Is CVE-2023-52497 a remote exploit?
CVE-2023-52497 is not categorized as a remote exploit; it primarily affects local operations within the system.
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