OpenBSD 7.4 and 7.3 m_split() network buffer kernel crash

published 2024-03-01 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-57182

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits: 0; none known

In OpenBSD 7.4 before errata 002 and OpenBSD 7.3 before errata 019, a network buffer that had to be split at certain length that could crash the kernel after receiving specially crafted escape sequences.

Patch / fix

fixed in 1 links 3

OpenBSD OpenBSD 7.3 errata 019, 7.3_errata_019, 7.4 errata 002, 7.4_errata_002

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 23 mo ago (2024-11-19)

Exploit prediction

0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

OpenBSD OpenBSD

Classification

Weakness

CWE-131 Incorrect Calculation of Buffer Size

References

Sources

CVE List CVE-2023-52558
NVD CVE-2023-52558

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary