Linux Kernel up to 6.1.148/6.6.102/6.12.43/6.16.3 btrfs btrfs_copy_root buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.1.148/6.6.102/6.12.43/6.16.3 and classified as critical. This affects the function btrfs_copy_root of the component btrfs. Executing a manipulation can lead to buffer overflow. This vulnerability appears as CVE-2025-39800. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.148/6.6.102/6.12.43/6.16.3. It has been declared as critical. This vulnerability affects the function btrfs_copy_root of the component btrfs. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: btrfs: abort transaction on unexpected eb generation at btrfs_copy_root() If we find an unexpected generation for the extent buffer we are cloning at btrfs_copy_root(), we just WARN_ON() and don't error out and abort the transaction, meaning we allow to persist metadata with an unexpected generation. Instead of warning only, abort the transaction and return -EUCLEAN.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2025-39800 since 04/16/2025. The exploitation appears to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/16/2026).

The vulnerability scanner Nessus provides a plugin with the ID 265710 (Debian dsa-6008 : ata-modules-6.12.31-armmp-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.149, 6.6.103, 6.12.44, 6.16.4 or 6.17-rc1 eliminates this vulnerability. Applying the patch 4290e34fb87ae556b12c216efd0ae91583446b7a/4734255ef39b416864139dcda96a387fe5f33a6a/da2124719f386b6e5d4d4b1a2e67c440e4d5892f/f4f5bd9251a4cbe55aaa05725c6c3c32ad1f74b3/33e8f24b52d2796b8cfb28c19a1a7dd6476323a8 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 (265710), EUVD (EUVD-2025-29186) and CERT Bund (WID-SEC-2025-2053). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Dell Secure Connect Gateway
  • F5 F5OS

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
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: 265710
Nessus Name: Debian dsa-6008 : ata-modules-6.12.31-armmp-di - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.149/6.6.103/6.12.44/6.16.4/6.17-rc1
Patch: 4290e34fb87ae556b12c216efd0ae91583446b7a/4734255ef39b416864139dcda96a387fe5f33a6a/da2124719f386b6e5d4d4b1a2e67c440e4d5892f/f4f5bd9251a4cbe55aaa05725c6c3c32ad1f74b3/33e8f24b52d2796b8cfb28c19a1a7dd6476323a8

Timelineinfo

04/16/2025 CVE reserved
09/15/2025 +152 days Advisory disclosed
09/15/2025 +0 days VulDB entry created
01/16/2026 +123 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39800 (🔒)
GCVE (CVE): GCVE-0-2025-39800
GCVE (VulDB): GCVE-100-323908
EUVD: 🔒
CERT Bund: WID-SEC-2025-2053 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/15/2025 15:56
Updated: 01/16/2026 22:20
Changes: 09/15/2025 15:56 (59), 09/15/2025 16:16 (1), 09/23/2025 12:19 (2), 01/02/2026 13:22 (7), 01/11/2026 12:26 (1), 01/16/2026 22:20 (11)
Complete: 🔍
Cache ID: 216::103

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