Libkcapi: iv reuse in libkcapi one-shot symmetric cipher chunking causes cipher state reset across chunk boundaries
CVSS score
6.5
EPSS probability
%0.5
Risk score
0.0
Published
2 mo ago
Kanıt listesindeki ürün ve sürüm eşleşmesini kontrol edin; bazı varyantlar hâlâ etkileniyor olabilir.
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
1
Source agreement
Tam uyum
Evidence confidence
%53
Short explanation
A medium-severity vulnerability in libkcapi (CVE-2026-71225) affects multiple Red Hat products. It allows remote attackers to exploit IV reuse during large input processing in stateful cipher modes, leading to confidentiality and integrity risks. No fixed version is publicly documented. Patch status is UNKNOWN.
This vulnerability exposes cryptographic weaknesses in widely used Red Hat platforms. Without a known patch, systems remain exposed to potential data leakage and integrity breaches during large data processing operations.
What should be done?
- Follow vendor advisories for Red Hat Enterprise Linux and OpenShift Container Platform
- No fixed version available in public records
- Patch assessment status is UNKNOWN
The sources give limited detail on some technical conditions. Review the chain of evidence below before deciding how to act.
Chain of evidence and sources
libkcapi'da bulunan bir eksiklik, büyük girişlerin işlenmesinde İlkleştirme Vektörü (IV) doğru şekilde yeniden kullanılmasının eksikliği nedeniyle, uzak saldırıcılara karşı veri gizliliğinin zayıflamasına ve veri bütünlüğünün etkilenmesine neden olabilir.
Bu eksiklik, Red Hat Enterprise Linux 8, 9, 10 ve Red Hat OpenShift Container Platform 4 üzerinde etkili olup, mevcut kaynaklarda belirtilen bir düzeltme sürümü yoktur.
CVSS puanı 6.5 (ORTA) olup, erişilebilirlik yüksek ve erişim yetkisi gerekmez, ancak aktif istismar veya düzeltme durumu hakkında bilgi yoktur.
Show the technical text from the sources
A flaw was found in libkcapi. When performing one-shot symmetric cipher operations on large inputs (over 64 KiB) in stateful modes such as Counter (CTR) or Cipher Block Chaining (CBC), the library improperly reuses the Initialization Vector (IV) for each internal data chunk. A remote attacker could potentially exploit this by making an application that uses libkcapi process specially crafted large inputs. This can lead to a significant weakening of data confidentiality, as the repeated IV use can expose relationships in encrypted plaintext, and may also affect data integrity by causing incorrect cryptographic processing.
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
CWE: CWE-330
Explanation produced with the local qwen3:4b-instruct model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-71225 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Stephan Muelle | libkcapi | View |
| 2 | Red Hat | Red Hat Enterprise Linux 10 | View |
| 3 | Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | View |
| 4 | Red Hat | Red Hat Enterprise Linux 8 | View |
| 5 | Red Hat | Red Hat Enterprise Linux 9 | View |
| 6 | Red Hat | Red Hat Hardened Images | View |
| 7 | Red Hat | Red Hat OpenShift Container Platform 4 | View |
| 8 | redhat | hardened images | View |
| 9 | redhat | openshift container platform | View |
| 10 | smuellerdd | libkcapi | View |
| 11 | redhat | enterprise linux | View |
| 12 | redhat | enterprise linux | View |
| 13 | redhat | enterprise linux | View |
| 14 | debian | libkcapi (sid) | View |
| 15 | debian | libkcapi (forky) | View |
| 16 | debian | libkcapi (trixie) | View |
| 17 | debian | libkcapi (bookworm) | View |
| 18 | debian | libkcapi (bullseye) | 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 |
|---|---|---|---|---|
| 6.5 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N | CVE CNA |
| 6.5 | CVSS V31 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N | NVD |
| 6.5 | CVSS 3.x | — | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N | Microsoft MSRC |
Patch and Remediation Guide
Solution & Remediation Advisory
1 düzeltme kanıtı bulundu; en az 5 ürün veya sürüm hâlâ etkileniyor ya da inceleniyor.
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-2026-71225 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-2026-71225 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
CVSS Vector Radar Chart
6.5 / 10Vulnerability Scoring Details
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness Type (CWE & CAPEC)
Similar Vulnerabilities
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