CVE-2026-118593
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Kernel Local BH Imbalance in RHEL 9 SRv6 Tunnel Handling
Vulnerability report for CVE-2026-118593, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-30
Last updated on: 2026-10-30
Assigner: redhat-SADP
Description
Description
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.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 9 | * |
| Red Hat | Red Hat OpenShift Container Platform 4 | * |
| Red Hat | Red Hat OpenShift Container Platform 5 | * |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-667 | The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. |
