What is CVE-2026-43253?

CVE-2026-43253 is a high-severity vulnerability in Linux, classified under Improper Locking. CVSS score: 7.5/10. Published 2026-05-06.

How severe is CVE-2026-43253?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Linux

CVE-2026-43253

In the Linux kernel, the following vulnerability has been resolved: iommu/amd: move wait_on_sem() out of spinlock With iommu.strict=1, the existing completion wait path can cause soft lockups under stressed environment, as wait_on_sem()…

EPSS: 0.001 (16.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Linux — versions 4bf5beef578e46393f11eb69dda7d17a065e05ff, 4.9, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Linux Linux_kernel

Weakness classification (CWE)

CWE-667 — Improper Locking

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

Frequently asked questions

What is CVE-2026-43253?: CVE-2026-43253 is a high-severity vulnerability in Linux, classified under Improper Locking. CVSS score: 7.5/10. Published 2026-05-06.
How severe is CVE-2026-43253?: High severity. CVSS v3 base score is 7.5 out of 10.