---
id: CVE-2026-118593
title: >-
  Kernel: local_bh imbalance in seg6_input_core() drop path (incomplete fix for
  cve-2026-46099)
summary: >-
  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 …
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-667
vendor: Red Hat
product: kernel
affected:
  - kernel
  - kernel
  - kernel
  - kernel-rt
  - kernel
  - kernel-rt
  - kernel (all versions)
  - kernel-rt
  - openshift/ose-rhel-coreos-8
  - openshift/ose-rhel-coreos-9 (all versions)
  - openshift/ose-rhel-coreos-9 (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-30T19:37:40.877163Z'
published: '2026-10-30'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T16:25:19.073Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118593'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-118593'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2563095'
    label: RHBZ#2563095
tags:
  - cve.org
epss: 0.00199
epssPercentile: 0.09832
ingestedAt: '2026-11-05T22:38:31.350Z'
---

## Overview

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.

## Affected

- `kernel`
- `kernel`
- `kernel`
- `kernel-rt`
- `kernel`
- `kernel-rt`
- `kernel (all versions)`
- `kernel-rt`
- `openshift/ose-rhel-coreos-8`
- `openshift/ose-rhel-coreos-9 (all versions)`
- `openshift/ose-rhel-coreos-9 (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.