Linux Kernel up to 7.2.7/7.3-rc3 sysctl do_proc_int_conv_ms_jiffies_minmax input validation

Summaryinfo

A vulnerability has been found in Linux Kernel up to 7.2.7/7.3-rc3 and classified as very critical. Impacted is the function do_proc_int_conv_ms_jiffies_minmax of the component sysctl. Performing a manipulation results in input validation. This vulnerability is reported as CVE-2026-98434. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.7/7.3-rc3. This affects the function do_proc_int_conv_ms_jiffies_minmax of the component sysctl. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: sysctl: Check range in proc_dointvec_ms_jiffies_minmax Add the range check to do_proc_int_conv_ms_jiffies_minmax that commit d174174c6776 ("sysctl: replace SYSCTL_INT_CONV_CUSTOM macro with functions") incorrectly removed.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-98434 since 09/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are required for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/18/2026).

Upgrading to version 7.2.8 or 7.3-rc4 eliminates this vulnerability. Applying the patch 1c23dba51dbf7e86c7c2e617c964be1411329cb4/82431877d837a6c2593efd8e66ba28b35a220ca4 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5
• 7.2.6
• 7.2.7
• 7.3-rc1
• 7.3-rc2
• 7.3-rc3

License

• open-source

Website

• Vendor: https://www.kernel.org/

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