# CVE-2025-39909: mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()

CVE-2025-39909 is fixed in 57 products on 1 platform, first by DEBIAN-CVE-2025-39909, released October 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-39909
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 1, 2025
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39909

## Description

In the Linux kernel, the following vulnerability has been resolved:  mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()  Patch series "mm/damon: avoid divide-by-zero in DAMON module's parameters application".  DAMON's RECLAIM and LRU_SORT modules perform no validation on user-configured parameters during application, which may lead to division-by-zero errors.  Avoid the divide-by-zero by adding validation checks when DAMON modules attempt to apply the parameters.   This patch (of 2):  During the calculation of 'hot_thres' and 'cold_thres', either 'sample_interval' or 'aggr_interval' is used as the divisor, which may lead to division-by-zero errors.  Fix it by directly returning -EINVAL when such a case occurs.  Additionally, since 'aggr_interval' is already required to be set no smaller than 'sample_interval' in damon_set_attrs(), only the case where 'sample_interval' is zero needs to be checked.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | bpftool-debuginfo amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | bpftool6.12 amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-64kb sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-debuginfo amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-default sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.6.1.160000.2.4 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-default-base sles 16.0 | 6.12.0-160000.6.1.160000.2.4 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-devel amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-docs sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-headers amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-kvmsmall sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-libbpf amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-libbpf-debuginfo amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-libbpf-devel amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-libbpf-static amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-livepatch-6.1.155-176.282 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-livepatch-6.12.48-67.114 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel-modules-extra amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-modules-extra-common amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-obs-qa sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-source sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-syms sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-tools amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-tools-debuginfo amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-tools-devel amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-zfcpdump sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel6.12 amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-devel amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-headers amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-libbpf amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-libbpf-debuginfo amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-libbpf-devel amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-libbpf-static amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-tools amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.153-1 | [DEBIAN-CVE-2025-39909](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39909.md) | Oct 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.12.48-1 | [DEBIAN-CVE-2025-39909](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39909.md) | Oct 1, 2025 |
| Linux | linux Debian 14 | 6.16.8-1 | [DEBIAN-CVE-2025-39909](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39909.md) | Oct 1, 2025 |
| Linux | perf amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | perf-debuginfo amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | perf6.12 amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | python3-perf amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | python3-perf-debuginfo amzn 2023 | 1:6.1.155-176.282.amzn2023 | [ALAS2023-2025-1223](https://patchblox.com/security/data/fix/linux/alas2023-2025-1223.md) | Oct 14, 2025 |
| Linux | python3-perf6.12 amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |
| Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.48-67.114.amzn2023 | [ALAS2023-2025-1227](https://patchblox.com/security/data/fix/linux/alas2023-2025-1227.md) | Oct 27, 2025 |

---

Data as of 2026-11-08T19:12:23Z 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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