EUVD-2026-62344
GHSA-c5hg-f3pf-qgxh
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Remote TLS peer drives the attack (AV:N); specific TCP segmentation control required (AC:H); no target-system authentication needed (PR:N); kernel panic is high availability impact (A:H); uninitialized kernel heap read adds low confidentiality risk (C:L).
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Kernel panic in FreeBSD's kernel TLS (kTLS) subsystem, specifically in ktls_ocf_tls_cbc_decrypt(), allows a remote TLS 1.2 peer to crash the kernel by exploiting an uninitialized iovec array bug during CBC record decryption. Affected versions span FreeBSD 14.3, 14.4, 15.0, and 15.1 prior to their respective patch levels, as confirmed by FreeBSD Security Advisory FreeBSD-SA-26:46.ktls. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | All three conditions must hold simultaneously: (1) Kernel TLS (kTLS) must be enabled on the FreeBSD host - kTLS is an opt-in performance subsystem and is not active by default on all deployments; systems not using kTLS are entirely unaffected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N, score 3.3) conflicts materially with the CVE description: the description explicitly states a 'remote TLS peer' triggers the fault, implying AV:N rather than AV:L, and the stated outcome is a kernel panic, which is A:H not A:N. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the patches published under FreeBSD Security Advisory FreeBSD-SA-26:46.ktls (https://security.freebsd.org/advisories/FreeBSD-SA-26:46.ktls.asc) by upgrading to FreeBSD 14.3-RELEASE-p16, 14.4-RELEASE-p7, 15.0-RELEASE-p11, or 15.1-RELEASE-p1 as applicable. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-908 – Use of Uninitialized Resource
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External POC / Exploit Code
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