CVE-2025-71147 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel systems, particularly those relying on TPM2 functionality, should assess exposure and prioritize patching affected versions. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure the security and stability of their systems. They should review system configurations, monitor Linux kernel updates, and apply patches to prevent potential system instability,

Why it matters

Memory leak vulnerability in Linux kernel's KEYS: trusted: tpm2_load_cmd function requires patching to prevent potential system instability and denial-of-service attacks.

• Memory leak vulnerability may lead to increased memory usage and potential system instability.
• Defenders should verify and apply patches to prevent potential denial-of-service (DoS) attacks.
• Successful exploitation requires authentication and access to the affected system.

Technical summary

The Linux kernel's KEYS: trusted: tpm2_load_cmd function has a memory leak vulnerability due to a temporary blob allocated indirectly via tpm2_key_decode not being freed in failure paths. This issue has been addressed with a cleanup helper. The vulnerability affects Linux kernel systems relying on TPM2 functionality, potentially leading to system instability and denial-of-service attacks if not patched. The fix involves adding a cleanup helper to free the temporary blob in failure paths, preventing memory leaks and potential system instability.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this memory leak vulnerability, particularly for systems relying on TPM2 functionality.

Recommended defensive actions

• Verify and apply patches for Linux kernel versions affected by this memory leak vulnerability.
• Review system configurations and TPM2 usage to ensure proper mitigation.
• Monitor Linux kernel updates and security advisories for further information.
• Perform vulnerability scanning to identify potentially affected systems.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and source item provide details on the memory leak vulnerability in the Linux kernel's KEYS: trusted: tpm2_load_cmd function. Multiple source references from the Linux kernel Git repository are provided, indicating the commits that address the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.