# CVE-2022-48635: linux: In the Linux kernel, the following vulnerability has been resolved:  fsdax: Fix infinite loop in dax_iomap_rw()  I go...

CVE-2022-48635 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48635, released April 28, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48635
- Priority: Routine
- CVSS: 6.2 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 28, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  fsdax: Fix infinite loop in dax_iomap_rw()  I got an infinite loop and a WARNING report when executing a tail command in virtiofs.    WARNING: CPU: 10 PID: 964 at fs/iomap/iter.c:34 iomap_iter+0x3a2/0x3d0   Modules linked in:   CPU: 10 PID: 964 Comm: tail Not tainted 5.19.0-rc7   Call Trace:   <TASK>   dax_iomap_rw+0xea/0x620   ? __this_cpu_preempt_check+0x13/0x20   fuse_dax_read_iter+0x47/0x80   fuse_file_read_iter+0xae/0xd0   new_sync_read+0xfe/0x180   ? 0xffffffff81000000   vfs_read+0x14d/0x1a0   ksys_read+0x6d/0xf0   __x64_sys_read+0x1a/0x20   do_syscall_64+0x3b/0x90   entry_SYSCALL_64_after_hwframe+0x63/0xcd  The tail command will call read() with a count of 0. In this case, iomap_iter() will report this WARNING, and always return 1 which casuing the infinite loop in dax_iomap_rw().  Fixing by checking count whether is 0 in dax_iomap_rw().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.2-1 | [DEBIAN-CVE-2022-48635](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48635.md) | Apr 28, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.0.2-1 | [DEBIAN-CVE-2022-48635](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48635.md) | Apr 28, 2024 |
| Linux | linux Debian 14 | 6.0.2-1 | [DEBIAN-CVE-2022-48635](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48635.md) | Apr 28, 2024 |

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