Kernel: local_bh imbalance in seg6_input_core() drop path (incomplete fix for cve-2026-46099)
CVSS score
5.9
EPSS probability
—
Risk score
0.6
Published
1 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%55
Short explanation
A flaw was found in Red Hat Enterprise Linux 9 kernel builds due to an incomplete backport of the CVE-2026-46099 fix, leaving a local_bh imbalance in seg6_input_core(). This can lead to softirq starvation and denial of service on systems with SRv6 tunnels configured.
This vulnerability poses a risk to critical network infrastructure stability by potentially causing softirq starvation and denial of service on systems configured with SRv6 tunnels.
What should be done?
- Follow official vendor advisories
- Apply updates according to vendor instructions
Chain of evidence and sources
Red Hat Enterprise Linux 9 çekirdek derlemelerinde, CVE-2026-46099 düzeltmesinin eksik backport edilmesi nedeniyle bir hata bulunmuştur.
Hata, seg6_input_core() fonksiyonunun düşüş yolunda alt yarıların devre dışı kalmasına ve local_bh dengesizliğine yol açmaktadır.
Bu durum, SRv6 tünelleri yapılandırılmış sistemlerde softirq açlığına ve hizmet dışı kalmaya neden olabilir.
Show the technical text from the sources
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
CWE: CWE-667
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-118593 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Red Hat | Red Hat Enterprise Linux 10 | View |
| 2 | Red Hat | Red Hat Enterprise Linux 6 | View |
| 3 | Red Hat | Red Hat Enterprise Linux 7 | View |
| 4 | Red Hat | Red Hat Enterprise Linux 8 | View |
| 5 | Red Hat | Red Hat Enterprise Linux 9 | View |
| 6 | Red Hat | Red Hat OpenShift Container Platform 4 | View |
| 7 | Red Hat | Red Hat OpenShift Container Platform 5 | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 5.9 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | CVE CNA |
| 5.9 | CVSS V31 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-118593 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-118593 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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