# CVE-2026-31652: linux: In the Linux kernel, the following vulnerability has been resolved:  mm/damon/stat: deallocate damon_call() failure l...

CVE-2026-31652 is fixed in linux on 1 platform by DEBIAN-CVE-2026-31652 (version 6.19.13-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-31652
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 24, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  mm/damon/stat: deallocate damon_call() failure leaking damon_ctx  damon_stat_start() always allocates the module's damon_ctx object (damon_stat_context).  Meanwhile, if damon_call() in the function fails, the damon_ctx object is not deallocated.  Hence, if the damon_call() is failed, and the user writes Y to “enabled” again, the previously allocated damon_ctx object is leaked.  This cannot simply be fixed by deallocating the damon_ctx object when damon_call() fails.  That's because damon_call() failure doesn't guarantee the kdamond main function, which accesses the damon_ctx object, is completely finished.  In other words, if damon_stat_start() deallocates the damon_ctx object after damon_call() failure, the not-yet-terminated kdamond could access the freed memory (use-after-free).  Fix the leak while avoiding the use-after-free by keeping returning damon_stat_start() without deallocating the damon_ctx object after damon_call() failure, but deallocating it when the function is invoked again and the kdamond is completely terminated.  If the kdamond is not yet terminated, simply return -EAGAIN, as the kdamond will soon be terminated.  The issue was discovered [1] by sashiko.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.19.13-1 | [DEBIAN-CVE-2026-31652](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31652.md) | May 15, 2026 |

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