Linux Kernel up to 5.18.12 READ_ONCE information disclosure

Summaryinfo

A vulnerability has been found in Linux Kernel up to 5.18.12 and classified as problematic. Affected by this issue is the function READ_ONCE. This manipulation causes information disclosure. This vulnerability is registered as CVE-2022-49638. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.18.12 and classified as problematic. Affected by this vulnerability is 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. The summary by CVE is:

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

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2022-49638 since 02/26/2025. The exploitation appears to be difficult. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 232916 (Amazon Linux 2 : kernel (ALASKERNEL-5.15-2025-068)), 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 1740e5922fbb705637ae9fa5203db132fc45f9f6/53ecd09ef2fb35fa69667ae8e414ef6b00fd3bf6/edeec63b13c252193d626c2a48d7a2f0e7016dc2/0cba7ca667ceb06934746ddd9833a25847bde81d/e088ceb73c24ab4774da391d54a6426f4bfaefce/e2828e8c605853f71267825c9415437c0a93e4f2/798c2cf57c63ab39c8aac24d6a3d50f4fa5eeb06/48d7ee321ea5182c6a70782aa186422a70e67e22 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 (232916). Several companies clearly confirm that VulDB is the primary source for best 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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Exploitinginfo

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Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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