CVE-2026-98116 Linux CVE debrief

Who should care

Linux kernel developers, Linux distribution maintainers, and system administrators responsible for managing Linux-based systems, especially those with high security requirements or exposed to potential local attacks.

Why it matters

CVE-2026-98116 is a high-severity use-after-free vulnerability in the Linux kernel's ALSA pcm subsystem. Local attackers can exploit this flaw to gain elevated privileges. Defenders should review and apply patches, monitor kernel updates, and consider additional security measures.

• Local privilege escalation is possible, allowing attackers to gain elevated privileges.
• The vulnerability can be exploited by a local attacker with low privileges.
• The exploit involves leveraging the use-after-free condition to execute arbitrary code with elevated privileges.
• Verification of patched versions and implementation of compensating controls are necessary.

Technical summary

The vulnerability is caused by a race condition between buffer reallocation and mmap operations in the Linux kernel's ALSA pcm subsystem. This can lead to a use-after-free condition, allowing local attackers to gain elevated privileges. The issue arises from the snd_pcm_hw_params() and snd_pcm_hw_free() functions not properly synchronizing with the snd_pcm_mmap_data() function, which can result in a stale, writable mapping of freed pages. Defenders should review and apply patches, monitor kernel updates, and consider additional security measures to mitigate this vulnerability.

Defensive priority

High

Recommended defensive actions

• Review and apply the available Linux kernel patches to fix the use-after-free vulnerability in the ALSA pcm subsystem.
• Monitor Linux kernel updates and ensure systems are running the latest patched version.
• Implement additional security measures such as SELinux or other Mandatory Access Control (MAC) systems to restrict access to sensitive resources.
• Verify the patched versions and implement compensating controls for exposed systems.
• 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.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 7.8 and HIGH severity. The Linux kernel patch commits are available, indicating a fix has been implemented.

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.