CVE-2026-74753 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution vendors, and users of Linux-based systems should be aware of this vulnerability and take necessary actions to mitigate the risk. They should assess Linux kernel version and patch status, apply available patches or updates, monitor system for suspicious activity, and review system configuration and hardening. This vulnerability has a CVSS score of 7.8 and is considered HIGH severity. The NVD entry is currently Received. The CVE record was published on 2026-08-26T15:16:54.387Z and has not been modified since then. Linux kernel maintainers and users should prioritize assessment and patching of this HIGH severity vulnerability. The vulnerability allows a local attacker to potentially elevate privileges due to improper handling of perf events in the Linux kernel. Evidence is based on limited details from the CVE Program and NVD. Further verification is recommended. The vulnerability has been resolved in the Linux kernel by rejecting group leaders in the EXIT state. Linux kernel maintainers and users should prioritize assessment and patching of this HIGH severity vulnerability. A new sibling can be linked to a detached leader, and when the leader is closed, the sibling retains a group_leader pointer to the freed event. The CVE-2026-74753 vulnerability is a HIGH severity issue in the Linux kernel that could allow local privilege escalation. The vulnerability is related to improper handling of perf events. A new sibling can be linked to a detached leader, and when the leader is closed, the sibling retains a group_leader pointer to the freed event. Rejecting group leaders in the EXIT state can prevent this issue. The vulnerability has been resolved by perf: Reject exited events as group leaders. The vulnerability has a CVSS score of 7.8 and is considered HIGH severity. The NVD entry is currently Received. The CVE record was published on 2026-08-26T15:16:54.387Z and has not been modified since then. Linux kernel maintainers and users should prioritize assessment and patching of this HIGH severity vulnerability. The vulnerability allows a local attacker to potentially elevate privileges due to improper handling of perf events in

Technical summary

The CVE-2026-74753 vulnerability is a HIGH severity issue in the Linux kernel that could allow local privilege escalation. The vulnerability is related to improper handling of perf events. A new sibling can be linked to a detached leader, and when the leader is closed, the sibling retains a group_leader pointer to the freed event. Rejecting group leaders in the EXIT state can prevent this issue. The vulnerability has been resolved by perf: Reject exited events as group leaders.

Defensive priority

Linux kernel maintainers and users should prioritize assessment and patching of this HIGH severity vulnerability.

Recommended defensive actions

• Assess Linux kernel version and patch status
• Apply available patches or updates
• Monitor system for suspicious activity
• Review system configuration and hardening
• Perform vulnerability scanning and asset inventory
• Implement compensating controls for exposed systems
• Track changes and updates to Linux kernel

Evidence notes

The CVE-2026-74753 vulnerability allows a local attacker to potentially elevate privileges due to improper handling of perf events in the Linux kernel. Evidence is based on limited details from the CVE Program and NVD. Further verification is recommended. The vulnerability has been resolved in the Linux kernel by rejecting group leaders in the EXIT state. Linux kernel maintainers and users should prioritize assessment and patching of this HIGH severity vulnerability. A new sibling can be linked to a detached leader, and when the leader is closed, the sibling retains a group_leader pointer to the freed event.

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.