# CVE-2023-52852: linux: In the Linux kernel, the following vulnerability has been resolved:  f2fs: compress: fix to avoid use-after-free on d...

CVE-2023-52852 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52852, released May 21, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-52852
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  f2fs: compress: fix to avoid use-after-free on dic  Call trace:  __memcpy+0x128/0x250  f2fs_read_multi_pages+0x940/0xf7c  f2fs_mpage_readpages+0x5a8/0x624  f2fs_readahead+0x5c/0x110  page_cache_ra_unbounded+0x1b8/0x590  do_sync_mmap_readahead+0x1dc/0x2e4  filemap_fault+0x254/0xa8c  f2fs_filemap_fault+0x2c/0x104  __do_fault+0x7c/0x238  do_handle_mm_fault+0x11bc/0x2d14  do_mem_abort+0x3a8/0x1004  el0_da+0x3c/0xa0  el0t_64_sync_handler+0xc4/0xec  el0t_64_sync+0x1b4/0x1b8  In f2fs_read_multi_pages(), once f2fs_decompress_cluster() was called if we hit cached page in compress_inode's cache, dic may be released, it needs break the loop rather than continuing it, in order to avoid accessing invalid dic pointer.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.64-1 | [DEBIAN-CVE-2023-52852](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52852.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.6.8-1 | [DEBIAN-CVE-2023-52852](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52852.md) | May 21, 2024 |
| Linux | linux Debian 14 | 6.6.8-1 | [DEBIAN-CVE-2023-52852](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52852.md) | May 21, 2024 |

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