What is CVE-2026-43249?

CVE-2026-43249 is a high-severity vulnerability in Linux, classified under Double Free. CVSS score: 8.8/10. Published 2026-05-06.

How severe is CVE-2026-43249?

High severity. CVSS v3 base score is 8.8 out of 10.

Double Free in Linux

CVE-2026-43249

In the Linux kernel, the following vulnerability has been resolved: 9p/xen: protect xen_9pfs_front_free against concurrent calls The xenwatch thread can race with other back-end change notifications and call xen_9pfs_front_free() twice…

Vulnerability class: Double Free

EPSS: 0.000 (5.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions be03c4fe72384366fd4077a70966bd3b8fc49013, 4.14.308, 5f6a8974e9ef317fe63f88bab1f33070195dd147
Linux Linux_kernel

Weakness classification (CWE)

CWE-415 — Double Free

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2026-43249?: CVE-2026-43249 is a high-severity vulnerability in Linux, classified under Double Free. CVSS score: 8.8/10. Published 2026-05-06.
How severe is CVE-2026-43249?: High severity. CVSS v3 base score is 8.8 out of 10.