CVE-2026-31911

Process termination via invalid BPF opcode

Published Sep 5, 2026 · Updated Sep 8, 2026

Reachable assertion in The Tcpdump Group libpcap before 1.10.7 allows local users to terminate a process via a crafted BPF program. The pcapint_filter_with_aux_data() interpreter calls abort() on an unrecognized instruction instead of rejecting the packet. Reachability requires an application to evaluate an externally supplied compiled filter through pcap_offline_filter() or bpf_filter(); libpcap-generated filters do not contain invalid opcodes.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in The Tcpdump Group libpcap before 1.10.7 allows local users to terminate a process via a crafted BPF program. The pcapint_filter_with_aux_data() interpreter calls abort() on an unrecognized instruction instead of rejecting the packet. Reachability requires an application to evaluate an externally supplied compiled filter through pcap_offline_filter() or bpf_filter(); libpcap-generated filters do not contain invalid opcodes.

The record

CVE
CVE-2026-31911
Published
Sep 5, 2026
Updated
Sep 8, 2026
Vendor
The Tcpdump Group
Product
libpcap
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.10.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Tcpdump Group · libpcapversion=0 <1.10.7

Published CVSS scores

5.5The Tcpdump GroupCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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