Linux Kernel up to 5.18.12 READ_ONCE information disclosure

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.18.12. It has been declared as problematic. This issue affects the function READ_ONCE. Executing a manipulation can lead to information disclosure. This vulnerability appears as CVE-2022-49639. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.18.12. It has been declared as problematic. This vulnerability affects the function READ_ONCE. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: cipso: Fix data-races around sysctl. While reading cipso sysctl variables, they can be changed concurrently. So, we need to add READ_ONCE() to avoid data-races.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2022-49639 since 02/26/2025. The exploitation appears to be difficult. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability scanner Nessus provides a plugin with the ID 238226 (EulerOS 2.0 SP13 : kernel (EulerOS-SA-2025-1635)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.9.324, 4.14.289, 4.19.253, 5.4.207, 5.10.132, 5.15.56 or 5.18.13 eliminates this vulnerability. Applying the patch 2764f82bbc158d106693ae3ced3675cf4b963b35/c321e99d2725d11f7e6a4ebd9ce752259f0bae81/ca26ca5e2f3eeb3e6fe699cd6effa3b4b2aa8698/0e41a0f73ccb9be112a80bde3804a771633caaef/fe2a35fa2c4f9c8ce5ef970eb927031387f9446a/07b0caf8aeb9b82e6ecc6c292a3e47c7fcdb1148/59e26906b89cc35bb54476498772b45cbc32323f/dd44f04b9214adb68ef5684ae87a81ba03632250 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 vulnerability database at Tenable (238226). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.9.323
• 4.14.288
• 4.19.252
• 5.4.206
• 5.10.131
• 5.15.0
• 5.15.1
• 5.15.2
• 5.15.3
• 5.15.4
• 5.15.5
• 5.15.6
• 5.15.7
• 5.15.8
• 5.15.9
• 5.15.10
• 5.15.11
• 5.15.12
• 5.15.13
• 5.15.14
• 5.15.15
• 5.15.16
• 5.15.17
• 5.15.18
• 5.15.19
• 5.15.20
• 5.15.21
• 5.15.22
• 5.15.23
• 5.15.24
• 5.15.25
• 5.15.26
• 5.15.27
• 5.15.28
• 5.15.29
• 5.15.30
• 5.15.31
• 5.15.32
• 5.15.33
• 5.15.34
• 5.15.35
• 5.15.36
• 5.15.37
• 5.15.38
• 5.15.39
• 5.15.40
• 5.15.41
• 5.15.42
• 5.15.43
• 5.15.44
• 5.15.45
• 5.15.46
• 5.15.47
• 5.15.48
• 5.15.49
• 5.15.50
• 5.15.51
• 5.15.52
• 5.15.53
• 5.15.54
• 5.15.55
• 5.18.0
• 5.18.1
• 5.18.2
• 5.18.3
• 5.18.4
• 5.18.5
• 5.18.6
• 5.18.7
• 5.18.8
• 5.18.9
• 5.18.10
• 5.18.11
• 5.18.12

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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CVSSv4info

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Exploitinginfo

Threat Intelligenceinfo

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Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

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