# CVE-2022-49560: linux: In the Linux kernel, the following vulnerability has been resolved:  exfat: check if cluster num is valid  Syzbot rep...

CVE-2022-49560 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49560, released February 26, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49560
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  exfat: check if cluster num is valid  Syzbot reported slab-out-of-bounds read in exfat_clear_bitmap. This was triggered by reproducer calling truncute with size 0, which causes the following trace:  BUG: KASAN: slab-out-of-bounds in exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174 Read of size 8 at addr ffff888115aa9508 by task syz-executor251/365  Call Trace:  __dump_stack lib/dump_stack.c:77 [inline]  dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118  print_address_description+0x81/0x3c0 mm/kasan/report.c:233  __kasan_report mm/kasan/report.c:419 [inline]  kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436  __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309  exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174  exfat_free_cluster+0x25a/0x4a0 fs/exfat/fatent.c:181  __exfat_truncate+0x99e/0xe00 fs/exfat/file.c:217  exfat_truncate+0x11b/0x4f0 fs/exfat/file.c:243  exfat_setattr+0xa03/0xd40 fs/exfat/file.c:339  notify_change+0xb76/0xe10 fs/attr.c:336  do_truncate+0x1ea/0x2d0 fs/open.c:65  Move the is_valid_cluster() helper from fatent.c to a common header to make it reusable in other *.c files. And add is_valid_cluster() to validate if cluster number is within valid range in exfat_clear_bitmap() and exfat_set_bitmap().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.2-1 | [DEBIAN-CVE-2022-49560](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49560.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.2-1 | [DEBIAN-CVE-2022-49560](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49560.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.2-1 | [DEBIAN-CVE-2022-49560](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49560.md) | Feb 26, 2025 |

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Data as of 2026-11-08T13:06:02Z 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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