Linux Kernel up to 5.15.74/5.19.16/6.0.2 NFSD Count buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.15.74/5.19.16/6.0.2. This issue affects some unknown processing of the component NFSD. Executing a manipulation of the argument Count can lead to buffer overflow. This vulnerability is tracked as CVE-2022-50235. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.15.74/5.19.16/6.0.2 and classified as critical. This vulnerability affects an unknown function of the component NFSD. The manipulation of the argument count 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: NFSD: Protect against send buffer overflow in NFSv2 READDIR Restore the previous limit on the @count argument to prevent a buffer overflow attack.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2022-50235 since 06/18/2025. 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 01/10/2026).

The vulnerability scanner Nessus provides a plugin with the ID 266163 (Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.15-2025-090 (ALASKERNEL-5.15-2025-090)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.75, 5.19.17 or 6.0.3 eliminates this vulnerability. Applying the patch 0e57d696f60dee6117a8ace0cac7c5761d375277/dc7f225090c29a5f3b9419b1af32846a201555e7/c2a878095b5c6f04f90553a3c45872f990dab14e/f59c74df82f6ac9d2ea4e01aa3ae7c6c4481652d/00b4492686e0497fdb924a9d4c8f6f99377e176c 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 (266163) 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: 7.9
VulDB Meta Temp Score: 7.7

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

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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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: 266163
Nessus Name: Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.15-2025-090 (ALASKERNEL-5.15-2025-090)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.75/5.19.17/6.0.3
Patch: 0e57d696f60dee6117a8ace0cac7c5761d375277/dc7f225090c29a5f3b9419b1af32846a201555e7/c2a878095b5c6f04f90553a3c45872f990dab14e/f59c74df82f6ac9d2ea4e01aa3ae7c6c4481652d/00b4492686e0497fdb924a9d4c8f6f99377e176c

Timelineinfo

06/18/2025 CVE reserved
09/15/2025 +89 days Advisory disclosed
09/15/2025 +0 days VulDB entry created
01/10/2026 +117 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2022-50235 (🔒)
GCVE (CVE): GCVE-0-2022-50235
GCVE (VulDB): GCVE-100-323932
CERT Bund: WID-SEC-2025-2053 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/15/2025 16:38
Updated: 01/10/2026 07:42
Changes: 09/15/2025 16:38 (59), 09/16/2025 10:15 (7), 09/30/2025 23:03 (2), 11/24/2025 19:42 (11), 12/27/2025 20:44 (1), 01/10/2026 07:42 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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