CVE-2025-68792 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, as well as users of Linux-based systems, should be aware of this vulnerability and take steps to ensure their systems are updated with the latest patches. They should also monitor Linux kernel updates for any related security advisories and perform regular vulnerability assessments to identify potential issues. Additionally, operators, platform administrators, and security teams may need to review compensating controls for exposed systems while remediation is scheduled and verified.

Technical summary

The vulnerability was in the tpm2-sessions component of the Linux kernel. The 'name_size' variable did not have any range checks, potentially leading to memory corruption. The issue was addressed by only processing known values and returning -EINVAL for unrecognized values. Additionally, 'tpm_buf_append_name' and 'tpm_buf_fill_hmac_session' were made fallible to detect errors before causing spurious TPM traffic. The authorization session is also ended on failure in both functions. This vulnerability has a high CVSS score of 7.8 and is considered High priority due to potential memory corruption.

Defensive priority

High priority due to potential memory corruption and high CVSS score of 7.8.

Recommended defensive actions

• Review and apply the provided patches to ensure the vulnerability is addressed.
• Monitor Linux kernel updates for any related security advisories.
• Perform regular vulnerability assessments to identify potential issues.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability. Three source references are provided, detailing the commits that address the issue. The vulnerability was in the tpm2-sessions component of the Linux kernel, where 'name_size' did not have range checks, potentially leading to memory corruption. The issue was addressed by only processing known values and returning -EINVAL for unrecognized values. Additionally, 'tpm_buf_append_name' and 'tpm_buf_fill_hmac_session' were made fallible to detect errors before causing spurious TPM traffic. The authorization session is also ended on failure in both functions. Linux kernel developers and users should verify their systems are updated with the latest patches and monitor for any related security advisories.

Official resources