CVE-2026-49423
UNSCOREDDescription
When building the iovec array for a received TLS 1.2 CBC record, ktls_ocf_tls_cbc_decrypt() incremented the iovec index for every mbuf in the chain, including mbufs that were skipped because they contained only TLS header bytes. This left uninitialized entries in the iovec array. The iovec array was allocated without zeroing. A remote TLS peer can cause the kernel to read from uninitialized iovec entries during HMAC computation, resulting in a kernel panic. The peer must be able to control TCP segmentation such that the first mbuf of a CBC record contains only the 5-byte TLS record header.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3.1 Vector
No CVSS vector data available.
Exploit Intelligence
Low risk: more likely to be exploited than 5% of all known CVEs.
References
Related Vulnerabilities
Other CWE-908 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2025-5777 | High | 7.5 | 100% | KEV + Ransom | Fix |
| CVE-2023-24941 | Critical | 9.8 | 95% | - | Fix |
| CVE-2007-1751 | High | 9.3 | 61% | - | - |
| CVE-2008-0081 | Critical | 9.8 | 58% | - | - |
| CVE-2020-1934 | Medium | 5.3 | 52% | - | Fix |
| CVE-2008-3475 | High | 8.8 | 40% | - | - |
Common questions
How do I fix CVE-2026-49423?
No published fix for CVE-2026-49423 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-49423 being actively exploited?
Not that we know of. CVE-2026-49423 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.15% is the estimated probability that it will be exploited in the next 30 days. That is higher than 5% of all scored CVEs.
Embed a live status badge for CVE-2026-49423
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-19.