Linux Kernel up to 6.18.29/7.0.3 mm /damon/core damon_start min_sz_region improper validation of specified quantity in input

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.18.29/7.0.3. Affected by this vulnerability is the function damon_start of the file /damon/core of the component mm. The manipulation of the argument min_sz_region leads to an unknown weakness. This vulnerability is referenced as CVE-2026-52905. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.29/7.0.3 and classified as critical. This issue affects the function damon_start of the file /damon/core of the component mm. The manipulation of the argument min_sz_region with an unknown input leads to a unknown weakness. Using CWE to declare the problem leads to CWE-1284. The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: disallow non-power of two min_region_sz on damon_start() Commit d8f867fa0825 ("mm/damon: add damon_ctx->min_sz_region") introduced a bug that allows unaligned DAMON region address ranges. Commit c80f46ac228b ("mm/damon/core: disallow non-power of two min_region_sz") fixed it, but only for damon_commit_ctx() use case. Still, DAMON sysfs interface can emit non-power of two min_region_sz via damon_start(). Fix the path by adding the is_power_of_2() check on damon_start(). The issue was discovered by sashiko [1].

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-52905 since 06/09/2026. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/12/2026).

The vulnerability scanner Nessus provides a plugin with the ID 320329 (Linux Distros Unpatched Vulnerability : CVE-2026-52905), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.30, 7.0.4 or 7.1-rc1 eliminates this vulnerability. Applying the patch 1de2db19a6028abe7d905875922faef5b873de67/89b6226b6c2a4add3939f361653a47c212d6ab75/95093e5cb4c5b50a5b1a4b79f2942b62744bd66a is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (320329) and CERT Bund (WID-SEC-2026-1870). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Open Source Linux Kernel

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper validation of specified quantity in input
CWE: CWE-1284 / CWE-703
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 320329
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-52905

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.30/7.0.4/7.1-rc1
Patch: 1de2db19a6028abe7d905875922faef5b873de67/89b6226b6c2a4add3939f361653a47c212d6ab75/95093e5cb4c5b50a5b1a4b79f2942b62744bd66a

Timelineinfo

06/09/2026 Advisory disclosed
06/09/2026 +0 days CVE reserved
06/09/2026 +0 days VulDB entry created
07/12/2026 +33 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-52905 (🔒)
GCVE (CVE): GCVE-0-2026-52905
GCVE (VulDB): GCVE-100-369545
CERT Bund: WID-SEC-2026-1870 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 06/09/2026 17:01
Updated: 07/12/2026 19:56
Changes: 06/09/2026 17:01 (60), 06/10/2026 22:01 (7), 06/11/2026 05:54 (2), 07/12/2026 19:56 (11)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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