OpenBSD 7.4 pf state race condition kernel crash
Priority LOW 27CWE-367Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00143 3rd percentileScored 2026-11-07
Fix Fixed OpenBSD (OpenBSD): 7.4 errata 009
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OpenBSD | OpenBSD | 7.4 to before 7.4 errata 009 | 7.4 errata 009 | Patch available | CNA |
- OpenBSD VendorOpenBSD Affected 7.4 to before 7.4 errata 009 Fixed in 7.4 errata 009 Patch available CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:* | before 7.4 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.4:-:*:*:*:*:*:* | 7.4 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.4:errata_001:*:*:*:*:*:* | 7.4 errata_001 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.4:errata_002:*:*:*:*:*:* | 7.4 errata_002 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.4:errata_003:*:*:*:*:*:* | 7.4 errata_003 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.4:errata_004:*:*:*:*:*:* | 7.4 errata_004 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.4:errata_005:*:*:*:*:*:* | 7.4 errata_005 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.4:errata_006:*:*:*:*:*:* | 7.4 errata_006 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.4:errata_007:*:*:*:*:*:* | 7.4 errata_007 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.4:errata_008:*:*:*:*:*:* | 7.4 errata_008 | Vulnerable | OpenBSD |
- cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:* Versions before 7.4 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.4:-:*:*:*:*:*:* Versions 7.4 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.4:errata_001:*:*:*:*:*:* Versions 7.4 errata_001 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.4:errata_002:*:*:*:*:*:* Versions 7.4 errata_002 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.4:errata_003:*:*:*:*:*:* Versions 7.4 errata_003 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.4:errata_004:*:*:*:*:*:* Versions 7.4 errata_004 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.4:errata_005:*:*:*:*:*:* Versions 7.4 errata_005 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.4:errata_006:*:*:*:*:*:* Versions 7.4 errata_006 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.4:errata_007:*:*:*:*:*:* Versions 7.4 errata_007 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.4:errata_008:*:*:*:*:*:* Versions 7.4 errata_008 Vulnerable ·OpenBSD
Remediation
- Fix · CNA OpenBSD (OpenBSD) Fixed in 7.4 errata 009
Timeline
- 2026-10-02 Threatist record created from CVE-2023-52556
- 2026-10-03 Alias added: GHSA-4x2w-rqr8-f75m
References
More Openbsd vulnerabilities
- TI-2002-00376 Integer overflow in xdr_array function in RPC servers for operating systems that use… CVSS 3.1CRITICAL 9.8
- TI-2003-00437 Off-by-one error in the fb_realpath() function, as derived from the realpath function in… CVSS 3.1CRITICAL 9.8
- TI-2007-05153 Stack-based buffer overflow in the cons_options function in options.c in dhcpd in OpenBSD… CVSS 2.0HIGH 7.2
- TI-2001-00539 Buffer overflow in BSD-based telnetd telnet daemon on various operating systems allows… CVSS 2.0HIGH 10.0
- TI-2026-40218 sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication… CVSS 3.1HIGH 8.3
- TI-2004-00444 Heap-based buffer overflow in proxy_util.c for mod_proxy in Apache 1.3.25 to 1.3.31… CVSS 2.0HIGH 10.0
Sources
- CVE-2023-52556 · CVE Program
- CVE-2023-52556 · NVD
- FIRST EPSS
- GHSA-4x2w-rqr8-f75m · GitHub Advisory Database · CC BY 4.0
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