CVE-2026-93260 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel security, system administrators, and developers should be aware of this vulnerability and take steps to verify and patch their systems. They should review system configurations and ensure IPI setup is properly aborted on failure to prevent use-after-free attacks. Linux kernel versions and patches should be verified to ensure IPI setup is properly aborted on failure.

Why it matters

A use-after-free vulnerability in the Linux kernel's powerpc/xive component requires verification of Linux kernel versions and application of patches to prevent use-after-free attacks.

• Potential use-after-free attacks on Linux kernel systems
• Need to verify Linux kernel versions and apply patches
• Possible system crashes or instability due to use-after-free attacks
• Required review of system configurations to ensure IPI setup is properly aborted on failure

Technical summary

The Linux kernel's powerpc/xive component has a use-after-free vulnerability. When xive_init_ipis() fails, the error path frees the global xive_ipis array, but xive_smp_probe() ignores this failure and proceeds to call xive_setup_cpu_ipi(), which dereferences the already-freed xive_ipis pointer. This vulnerability can lead to potential system crashes or instability due to use-after-free attacks. Defenders should prioritize verifying Linux kernel versions and applying patches to prevent use-after-free attacks. The vulnerability requires verification of Linux kernel versions and application of patches to prevent use-after-free attacks.

Defensive priority

Defenders should prioritize verifying Linux kernel versions and applying patches to prevent use-after-free attacks.

Recommended defensive actions

• Verify Linux kernel versions and apply patches to prevent use-after-free attacks
• Review system configurations and ensure IPI setup is properly aborted on failure
• Monitor system logs for potential use-after-free attacks
• Perform a thorough review of system configurations to ensure IPI setup is properly aborted on failure
• 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, but additional verification is needed to confirm affected versions and exploitation. Linux kernel versions and patches should be verified to ensure IPI setup is properly aborted on failure. The vulnerability's impact on system configurations and potential use-after-free attacks should be reviewed.

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.