Linux Kernel up to 6.19.5 ntfs3 run_unpack denial of service

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5.5$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.19.5. The impacted element is the function run_unpack of the component ntfs3. This manipulation causes denial of service. This vulnerability appears as CVE-2025-71265. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.19.5. Affected by this vulnerability is the function run_unpack of the component ntfs3. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: fs: ntfs3: fix infinite loop in attr_load_runs_range on inconsistent metadata We found an infinite loop bug in the ntfs3 file system that can lead to a Denial-of-Service (DoS) condition. A malformed NTFS image can cause an infinite loop when an attribute header indicates an empty run list, while directory entries reference it as containing actual data. In NTFS, setting evcn=-1 with svcn=0 is a valid way to represent an empty run list, and run_unpack() correctly handles this by checking if evcn + 1 equals svcn and returning early without parsing any run data. However, this creates a problem when there is metadata inconsistency, where the attribute header claims to be empty (evcn=-1) but the caller expects to read actual data. When run_unpack() immediately returns success upon seeing this condition, it leaves the runs_tree uninitialized with run->runs as a NULL. The calling function attr_load_runs_range() assumes that a successful return means that the runs were loaded and sets clen to 0, expecting the next run_lookup_entry() call to succeed. Because runs_tree remains uninitialized, run_lookup_entry() continues to fail, and the loop increments vcn by zero (vcn += 0), leading to an infinite loop. This patch adds a retry counter to detect when run_lookup_entry() fails consecutively after attr_load_runs_vcn(). If the run is still not found on the second attempt, it indicates corrupted metadata and returns -EINVAL, preventing the Denial-of-Service (DoS) vulnerability.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2025-71265 since 03/17/2026. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 302907 (Linux Distros Unpatched Vulnerability : CVE-2025-71265), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.16, 6.19.6 or 7.0-rc1 eliminates this vulnerability. Applying the patch 6f07a590616ff5f57f7c041d98e463fad9e9f763/a89bc96d5abd8a4a8d5d911884ea347efcdf460b/af839013c70a24779f9d1afb1575952009312d38/78b61f7eac37a63284774b147f38dd0be6cad43c/c0b43c45d45f59e7faad48675a50231a210c379b/3c3a6e951b9b53dab2ac460a655313cf04c4a10a/4b90f16e4bb5607fb35e7802eb67874038da4640 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 (302907), EUVD (EUVD-2025-208818) and CERT Bund (WID-SEC-2026-0774). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel

Productinfo

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Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Denial of service
CWE: CWE-404
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: 302907
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-71265

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.202/6.1.165/6.6.128/6.12.75/6.18.16/6.19.6/7.0-rc1
Patch: 6f07a590616ff5f57f7c041d98e463fad9e9f763/a89bc96d5abd8a4a8d5d911884ea347efcdf460b/af839013c70a24779f9d1afb1575952009312d38/78b61f7eac37a63284774b147f38dd0be6cad43c/c0b43c45d45f59e7faad48675a50231a210c379b/3c3a6e951b9b53dab2ac460a655313cf04c4a10a/4b90f16e4bb5607fb35e7802eb67874038da4640

Timelineinfo

03/17/2026 CVE reserved
03/18/2026 +1 days Advisory disclosed
03/18/2026 +0 days VulDB entry created
06/24/2026 +97 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-71265 (🔒)
GCVE (CVE): GCVE-0-2025-71265
GCVE (VulDB): GCVE-100-351523
EUVD: 🔒
CERT Bund: WID-SEC-2026-0774 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 03/18/2026 11:59
Updated: 06/24/2026 01:00
Changes: 03/18/2026 11:59 (59), 03/18/2026 12:52 (1), 03/18/2026 14:48 (7), 03/19/2026 13:39 (2), 03/22/2026 05:48 (1), 04/29/2026 20:08 (1), 05/20/2026 22:32 (10), 06/24/2026 01:00 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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