3.3

CVE-2026-49423: Remote DOS via uninitialized memory access in KTLS receive

Analyzed
Published 19-08-2026Last modified 26-08-2026

Vulnerability summary

CVE-2026-49423 is a low (CVSS 3.3) Use of Uninitialized Resource vulnerability in freebsd. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 3.3, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
3.3/10
010
Low · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 19-08-2026
    PublishedVulnerability first disclosed.
  2. 26-08-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.14% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Freebsd1 product
  • freebsdEOL≥ 15.1-RELEASE, < p1 | ≥ 15.0-RELEASE, < p11 | ≥ 14.4-RELEASE, < p7 | ≥ 14.3-RELEASE, < p16 | 14.3 | 14.3:p1 | 14.3:p10 | 14.3:p11 | 14.3:p12 | 14.3:p13 | 14.3:p14 | 14.3:p15 | 14.3:p2 | 14.3:p3 | 14.3:p4 | 14.3:p5 | 14.3:p6 | 14.3:p7 | 14.3:p8 | 14.3:p9 | 14.4 | 14.4:p1 | 14.4:p2 | 14.4:p3 | 14.4:p4 | 14.4:p5 | 14.4:p6 | 14.4:rc1 | 15.0 | 15.0:p1 | 15.0:p10 | 15.0:p2 | 15.0:p3 | 15.0:p4 | 15.0:p5 | 15.0:p6 | 15.0:p7 | 15.0:p8 | 15.0:p9 | 15.1 | 15.1:rc2 | 15.1:rc3-p1

1 vendor · 1 product

References

1 links