Home/CVE/In OpenBSD 7.4 before errata 009, a race condition between pf(4)'s processing of packets and expiration of packet states
CVE

CVE-2023-52556

In OpenBSD 7.4 before errata 009, a race condition between pf(4)'s processing of packets and expiration of packet states

In OpenBSD 7.4 before errata 009, a race condition between pf(4)'s processing of packets and expiration of packet states may cause a kernel panic.

MEDIUM · CVSS 6.2 EPSS 0.00019
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
▤

Affected Products & Versions

2
openbsd< 7.4
openbsdall versions
▣

Scoring & Timeline

6.2
MEDIUM · CVSS v3.1 · 9119a7d8-5eab-497f-8521-727c672e3725
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Mar 2024 · 05:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://ftp.openbsd.org/pub/OpenBSD/patches/7.4/common/009_pf.patch.sigPatch
https://github.com/openbsd/src/commit/9d9f4dc6c833cb79d13f836581e3a781d06842e7Patch
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