# CVE-2024-40969: f2fs: don't set RO when shutting down f2fs

CVE-2024-40969 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-40969, released July 12, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-40969
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 12, 2024
- Weakness: Improper Locking
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-40969

## Description

In the Linux kernel, the following vulnerability has been resolved:  f2fs: don't set RO when shutting down f2fs  Shutdown does not check the error of thaw_super due to readonly, which causes a deadlock like below.  f2fs_ioc_shutdown(F2FS_GOING_DOWN_FULLSYNC)        issue_discard_thread  - bdev_freeze   - freeze_super  - f2fs_stop_checkpoint()   - f2fs_handle_critical_error                     - sb_start_write     - set RO                                         - waiting  - bdev_thaw   - thaw_super_locked     - return -EINVAL, if sb_rdonly()  - f2fs_stop_discard_thread   -> wait for kthread_stop(discard_thread);

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.9.7-1 | [DEBIAN-CVE-2024-40969](https://patchblox.com/security/data/fix/linux/debian-cve-2024-40969.md) | Jul 12, 2024 |
| Linux | linux Debian 14 | 6.9.7-1 | [DEBIAN-CVE-2024-40969](https://patchblox.com/security/data/fix/linux/debian-cve-2024-40969.md) | Jul 12, 2024 |

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