Medium severity · published Oct 30, 2026
CVE-2026-118593
Kernel: local_bh imbalance in seg6_input_core() drop path (incomplete fix for cve-2026-46099)
New
5.9
CVSS
–
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat OpenShift Container Platform 4 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat OpenShift Container Platform 5 · Red Hat
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-118593
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-118593
vdb-entry
https://access.redhat.com/security/cve/CVE-2026-118593
issue-tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2563095
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