# CVE-2024-44941: linux: In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to cover read extent cache access with...

CVE-2024-44941 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-44941, released August 26, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-44941
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 26, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to cover read extent cache access with lock  syzbot reports a f2fs bug as below:  BUG: KASAN: slab-use-after-free in sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46 Read of size 4 at addr ffff8880739ab220 by task syz-executor200/5097  CPU: 0 PID: 5097 Comm: syz-executor200 Not tainted 6.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace:  <TASK>  __dump_stack lib/dump_stack.c:88 [inline]  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114  print_address_description mm/kasan/report.c:377 [inline]  print_report+0x169/0x550 mm/kasan/report.c:488  kasan_report+0x143/0x180 mm/kasan/report.c:601  sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46  do_read_inode fs/f2fs/inode.c:509 [inline]  f2fs_iget+0x33e1/0x46e0 fs/f2fs/inode.c:560  f2fs_nfs_get_inode+0x74/0x100 fs/f2fs/super.c:3237  generic_fh_to_dentry+0x9f/0xf0 fs/libfs.c:1413  exportfs_decode_fh_raw+0x152/0x5f0 fs/exportfs/expfs.c:444  exportfs_decode_fh+0x3c/0x80 fs/exportfs/expfs.c:584  do_handle_to_path fs/fhandle.c:155 [inline]  handle_to_path fs/fhandle.c:210 [inline]  do_handle_open+0x495/0x650 fs/fhandle.c:226  do_syscall_x64 arch/x86/entry/common.c:52 [inline]  do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83  entry_SYSCALL_64_after_hwframe+0x77/0x7f  We missed to cover sanity_check_extent_cache() w/ extent cache lock, so, below race case may happen, result in use after free issue.  - f2fs_iget  - do_read_inode   - f2fs_init_read_extent_tree   : add largest extent entry in to cache 					- shrink 					 - f2fs_shrink_read_extent_tree 					  - __shrink_extent_tree 					   - __detach_extent_node 					   : drop largest extent entry   - sanity_check_extent_cache   : access et->largest w/o lock  let's refactor sanity_check_extent_cache() to avoid extent cache access and call it before f2fs_init_read_extent_tree() to fix this issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.10.6-1 | [DEBIAN-CVE-2024-44941](https://patchblox.com/security/data/fix/linux/debian-cve-2024-44941.md) | Aug 26, 2024 |
| Linux | linux Debian 14 | 6.10.6-1 | [DEBIAN-CVE-2024-44941](https://patchblox.com/security/data/fix/linux/debian-cve-2024-44941.md) | Aug 26, 2024 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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