What is CVE-2026-118593?

CVE-2026-118593 is a medium-severity vulnerability in Red Hat Enterprise Linux 9, classified under Improper Locking. CVSS score: 5.9/10. Published 2026-10-30.

How severe is CVE-2026-118593?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Red Hat Enterprise Linux 9

CVE-2026-118593

A flaw was found in Red Hat Enterprise Linux 9 kernel builds. An incomplete backport of the CVE-2026-46099 fix in RHEL 9.6 through 9.10 left a local_bh imbalance in seg6_input_core(), where the drop path returns with bottom halves still disabled. This can lead to softirq starvation and denial of service on systems with SRv6 tunnels configured. Upstream and RHEL 10 are not affected.

Published 2026-10-30 · last modified 2026-10-30.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (9.8th percentile), scored 2026-10-31.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

CWE-667 — Improper Locking

References

access.redhat.com/security/cve/CVE-2026-118593 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-118593?: CVE-2026-118593 is a medium-severity vulnerability in Red Hat Enterprise Linux 9, classified under Improper Locking. CVSS score: 5.9/10. Published 2026-10-30.
How severe is CVE-2026-118593?: Medium severity. CVSS v3 base score is 5.9 out of 10.