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CVE-2023-52558

OpenBSD 7.4 and 7.3 m_split() network buffer kernel crash

HIGH
7.5
CVSS Score
Published: March 1, 2024 at 04:33 PM UTC
Updated: June 17, 2026 at 06:43 AM UTC
1 product affected across 1 vendorOpenBSD

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

OpenBSD· Openbsd
95%
v < 7.37.3 ≤ v < 7.3 errata 0197.3 ≤ v < 7.3_errata_0197.4 ≤ v < 7.4 errata 0027.4 ≤ v < 7.4_errata_0027.37.3 errata_0017.3 errata_0027.3 errata_0037.3 errata_0047.3 errata_0057.3 errata_0067.3 errata_0077.3 errata_0087.3 errata_0097.3 errata_0107.3 errata_0117.3 errata_0127.3 errata_0137.3 errata_0147.3 errata_0157.3 errata_0167.3 errata_0177.3 errata_0187.47.4 errata_001
Affected range stops below 7.3 errata 019, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4 errata 002, so it looks safe — our inference, not a vendor statement

References (3)

Patch
Source: 9119a7d8-5eab-497f-8521-727c672e3725
https://ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/019_msplit.patch.sig
Patch
Source: 9119a7d8-5eab-497f-8521-727c672e3725
https://ftp.openbsd.org/pub/OpenBSD/patches/7.4/common/002_msplit.patch.sig
Patch
Source: 9119a7d8-5eab-497f-8521-727c672e3725
https://github.com/openbsd/src/commit/7b4d35e0a60ba1dd4daf4b1c2932020a22463a89

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-131

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