CVE-2026-98969 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, System administrators and users of Linux-based systems, operators of Linux-based infrastructure, security teams responsible for vulnerability management, and platform owners using Linux in their products.

Why it matters

A vulnerability in the Linux kernel's net/sched: em_text component can lead to a kernel memory disclosure, potentially allowing attackers to access sensitive information or gain elevated privileges.

• Potential kernel memory disclosure
• Possible system crashes or instability
• Increased risk of privilege escalation
• Potential data breaches or unauthorized access

Technical summary

The em_text_change function in the Linux kernel's net/sched: em_text component does not properly validate the algorithm name, leading to a potential kernel memory disclosure. The function casts the raw netlink attribute payload to struct tcf_em_text and passes conf->algo, a 16-byte array with no enforced NUL terminator, to textsearch_prepare(). This can cause an out-of-bounds read when the algorithm name is not properly terminated.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided patches to the Linux kernel
• Restrict access to the net/sched: em_text component to trusted users
• Monitor system logs for potential exploitation attempts
• Perform a thorough review of system configurations and user access controls
• Implement additional security measures such as SELinux or AppArmor
• Conduct regular security audits and vulnerability assessments
• Keep the Linux kernel and related software up-to-date with the latest security patches

Evidence notes

The CVE record and Linux kernel source code indicate a memory disclosure vulnerability in the net/sched: em_text component. The issue is caused by a missing NUL terminator in the conf->algo array, which can lead to an out-of-bounds read when passed to textsearch_prepare().

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.