CVE-2026-53109 Linux CVE debrief

Who should care

Linux system administrators, security teams, and developers using Linux kernel versions between 6.6 and 6.18.33 or between 6.19 and 7.0.10 should assess exposure and prioritize patching or mitigating this vulnerability.

Why it matters

CVE-2026-53109 is a Linux kernel vulnerability that can cause bad page state errors. Defenders should assess exposure, prioritize patching or mitigation, and monitor system logs.

• Defenders should verify Linux kernel versions and patch or mitigate the vulnerability to prevent bad page state errors.
• System administrators should monitor system logs for bad page state errors.
• Security teams should assess exposure and prioritize patching or mitigating this vulnerability.

Technical summary

The Linux kernel vulnerability, CVE-2026-53109, was resolved to address a bad page state issue in pte_frag_destroy. The problem occurred when a folio, with an active flag set, was freed during the do_exit() path, leading to a bad page state error. The fix involves clearing the folio active flag before calling pagetable_dtor() and pagetable_free() in the do_exit() path. Defenders should assess exposure, prioritize patching or mitigation, and monitor system logs for bad page state errors. The vulnerability affects Linux kernel versions between 6.6 and 6.18.33 or between 6.19 and 7.0.10.

Defensive priority

Linux system administrators and security teams should assess exposure and verify if their systems are using affected kernel versions. They should prioritize patching or mitigating this vulnerability to prevent potential bad page state errors.

Recommended defensive actions

• Assess exposure by checking if your Linux systems are using kernel versions between 6.6 and 6.18.33 or between 6.19 and 7.0.10.
• Verify if your systems have been patched or mitigated against this vulnerability.
• Monitor system logs for bad page state errors.
• Update Linux kernel to a version outside the affected ranges.
• 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 issue was reported and resolved in the Linux kernel. The fix involves clearing the folio active flag before calling pagetable_dtor() and pagetable_free() in the do_exit() path. Defenders should verify Linux kernel versions and patch or mitigate the vulnerability to prevent bad page state errors. The vulnerability can cause bad page state errors, and system administrators should monitor system logs for such errors. The CVE record was published on 2026-06-24T17:17:25.230Z and has not been modified since then. The fix is related to p

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.