What is CVE-2026-45889?

CVE-2026-45889 is a medium-severity vulnerability in Linux, classified under Divide By Zero. CVSS score: 5.5/10. Published 2026-05-27.

How severe is CVE-2026-45889?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Linux

CVE-2026-45889

In the Linux kernel, the following vulnerability has been resolved: mptcp: do not account for OoO in mptcp_rcvbuf_grow() MPTCP-level OoOs are physiological when multiple subflows are active concurrently and will not cause retransmissions…

EPSS: 0.002 (4.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Linux — versions e118cdc34dd109562b64f6a397f68cd33b041d5b, 6.18, 0
Linux Linux_kernel

Weakness classification (CWE)

CWE-369 — Divide By Zero

References

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

Frequently asked questions

What is CVE-2026-45889?: CVE-2026-45889 is a medium-severity vulnerability in Linux, classified under Divide By Zero. CVSS score: 5.5/10. Published 2026-05-27.
How severe is CVE-2026-45889?: Medium severity. CVSS v3 base score is 5.5 out of 10.