OOBR in libpcap before 1.10.7

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-31912
StatePUBLISHED
AssignerTcpdump
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-05 19:16:55 UTC
Updated2026-09-05 19:16:55 UTC
Descriptionlibpcap BPF interpreter detects neither reaching the end of the filter program buffer due to lack of a return instruction nor executing a jump instruction with an offset that translates to a pointer outside of the buffer. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading the OS process memory in the 32GiB around the buffer on 64-bit architectures and in the entire address space on 32-bit architectures.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-125 | CWE-823 | CWE-1285 | CWE-1285 CWE-1285 Improper Validation of Specified Index, Position, or Offset in Input | CWE-823 CWE-823 Use of Out-of-range Pointer Offset | CWE-125 CWE-125 Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA The Tcpdump Group Libpcap affected 1.10.7 semver Not specified

References

ReferenceSourceLinkTags
github.com/the-tcpdump-group/libpcap/commit/d3f358d3cffbe1ecb94d5284b3e8... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Denis Ovsienko (en)

Additional Advisory Data

Solutions

CNA: Upgrade to libpcap 1.10.7 and migrate from bpf_filter() to pcap_offline_filter().

Exploits

CNA: A functional exploit exists.

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