# CVE-2025-40228: linux: In the Linux kernel, the following vulnerability has been resolved:  mm/damon/sysfs: catch commit test ctx alloc fail...

CVE-2025-40228 is fixed in linux on 1 platform by DEBIAN-CVE-2025-40228 (version 6.17.6-1), released December 4, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-40228
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 4, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  mm/damon/sysfs: catch commit test ctx alloc failure  Patch series "mm/damon/sysfs: fix commit test damon_ctx [de]allocation".  DAMON sysfs interface dynamically allocates and uses a damon_ctx object for testing if given inputs for online DAMON parameters update is valid. The object is being used without an allocation failure check, and leaked when the test succeeds.  Fix the two bugs.   This patch (of 2):  The damon_ctx for testing online DAMON parameters commit inputs is used without its allocation failure check.  This could result in an invalid memory access.  Fix it by directly returning an error when the allocation failed.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.17.6-1 | [DEBIAN-CVE-2025-40228](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40228.md) | Dec 4, 2025 |

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