What is CVE-2026-45999?

CVE-2026-45999 is a high-severity vulnerability in Linux, classified under Integer Underflow. CVSS score: 7.1/10. Published 2026-05-27.

How severe is CVE-2026-45999?

High severity. CVSS v3 base score is 7.1 out of 10.

Integer overflow in Linux

CVE-2026-45999

In the Linux kernel, the following vulnerability has been resolved: erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap() Some crafted images can have illegal (!partial_decoding && m_llen < m_plen) extents, and the LZ4 inplace de…

EPSS: 0.001 (3.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

Affected products

Linux — versions 5.15.210, 6.1.176, 7.1-rc1
Linux Linux_kernel

Weakness classification (CWE)

CWE-191 — Integer Underflow

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

Frequently asked questions

What is CVE-2026-45999?: CVE-2026-45999 is a high-severity vulnerability in Linux, classified under Integer Underflow. CVSS score: 7.1/10. Published 2026-05-27.
How severe is CVE-2026-45999?: High severity. CVSS v3 base score is 7.1 out of 10.