# CVE-2022-50747: linux: In the Linux kernel, the following vulnerability has been resolved:  hfs: Fix OOB Write in hfs_asc2mac  Syzbot report...

CVE-2022-50747 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50747, released December 24, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-50747
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 24, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  hfs: Fix OOB Write in hfs_asc2mac  Syzbot reported a OOB Write bug:  loop0: detected capacity change from 0 to 64 ================================================================== BUG: KASAN: slab-out-of-bounds in hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133 Write of size 1 at addr ffff88801848314e by task syz-executor391/3632  Call Trace:  <TASK>  __dump_stack lib/dump_stack.c:88 [inline]  dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106  print_address_description+0x74/0x340 mm/kasan/report.c:284  print_report+0x107/0x1f0 mm/kasan/report.c:395  kasan_report+0xcd/0x100 mm/kasan/report.c:495  hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133  hfs_cat_build_key+0x92/0x170 fs/hfs/catalog.c:28  hfs_lookup+0x1ab/0x2c0 fs/hfs/dir.c:31  lookup_open fs/namei.c:3391 [inline]  open_last_lookups fs/namei.c:3481 [inline]  path_openat+0x10e6/0x2df0 fs/namei.c:3710  do_filp_open+0x264/0x4f0 fs/namei.c:3740  If in->len is much larger than HFS_NAMELEN(31) which is the maximum length of an HFS filename, a OOB write could occur in hfs_asc2mac(). In that case, when the dst reaches the boundary, the srclen is still greater than 0, which causes a OOB write. Fix this by adding a check on dstlen in while() before writing to dst address.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.4-1 | [DEBIAN-CVE-2022-50747](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50747.md) | Dec 24, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.4-1 | [DEBIAN-CVE-2022-50747](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50747.md) | Dec 24, 2025 |
| Linux | linux Debian 14 | 6.1.4-1 | [DEBIAN-CVE-2022-50747](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50747.md) | Dec 24, 2025 |

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