Linux Kernel up to 6.1.158/6.6.117/6.12.59/6.17.9 mtdchar check_add_overflow integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.1.158/6.6.117/6.12.59/6.17.9. This affects the function check_add_overflow of the component mtdchar. Executing a manipulation can lead to integer overflow. This vulnerability appears as CVE-2025-68237. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.158/6.6.117/6.12.59/6.17.9. It has been declared as critical. This vulnerability affects the function check_add_overflow of the component mtdchar. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: mtdchar: fix integer overflow in read/write ioctls The "req.start" and "req.len" variables are u64 values that come from the user at the start of the function. We mask away the high 32 bits of "req.len" so that's capped at U32_MAX but the "req.start" variable can go up to U64_MAX which means that the addition can still integer overflow. Use check_add_overflow() to fix this bug.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2025-68237 since 12/16/2025. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 02/21/2026).

The vulnerability scanner Nessus provides a plugin with the ID 299530 (Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-1430)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.159, 6.6.118, 6.12.60 or 6.17.10 eliminates this vulnerability. Applying the patch f37efdd97fd1ec3e0d0f1eec279c8279e28f981e/457376c6fbf0c69326a9bf1f72416225f681192b/eb9361484814fb12f3b7544b33835ea67d7a6a97/37944f4f8199cd153fef74e95ca268020162f212/e4185bed738da755b191aa3f2e16e8b48450e1b8 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 (299530) and CERT Bund (WID-SEC-2025-2868). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.6

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

CVSSv2info

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

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 299530
Nessus Name: Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-1430)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.159/6.6.118/6.12.60/6.17.10
Patch: f37efdd97fd1ec3e0d0f1eec279c8279e28f981e/457376c6fbf0c69326a9bf1f72416225f681192b/eb9361484814fb12f3b7544b33835ea67d7a6a97/37944f4f8199cd153fef74e95ca268020162f212/e4185bed738da755b191aa3f2e16e8b48450e1b8

Timelineinfo

12/16/2025 Advisory disclosed
12/16/2025 +0 days CVE reserved
12/16/2025 +0 days VulDB entry created
02/21/2026 +67 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-68237 (🔒)
GCVE (CVE): GCVE-0-2025-68237
GCVE (VulDB): GCVE-100-336778
CERT Bund: WID-SEC-2025-2868 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 12/16/2025 16:04
Updated: 02/21/2026 23:02
Changes: 12/16/2025 16:04 (59), 01/20/2026 02:00 (7), 02/03/2026 13:02 (1), 02/19/2026 18:07 (2), 02/21/2026 23:02 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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