critical severityConfidence mediumHistorical record

libpcap crafted BPF filters can walk process memory

Direct answer

libpcap crafted BPF filters can walk process memory, also tracked as CVE-2026-0799 / libpcap BPF rpcap is a critical-severity threat campaign HOL Guard tracked from Sep 5, 2026 to Sep 5, 2026, verified against 3 primary sources and last reviewed Sep 20, 2026. Active tracking has ended and the record remains published as a permanent historical research record.

Crafted BPF filters can cause libpcap to walk process memory (rpcap / filter handling). Operators should upgrade to the fixed libpcap release cited by the vendor/NVD for their train.

Also tracked as CVE-2026-0799 · libpcap BPF rpcap

First observed
Sep 5, 2026
Last observed
Sep 5, 2026
Last reviewed
Sep 20, 2026
Tracking ended
Sep 5, 2026

Record exports

JSON recordArtifact CSVSTIX 2.1 bundle

Uncertainty and limitations

Read the evidence limits before acting on this record.

Exact fixed version must be confirmed against NVD/vendor for your libpcap package train.

  • Pack lacked detailed fixed-version list; confirm against NVD/distro advisories.
  • Impact depends on bpf/rpcap exposure in your capture stack.
  • HOL blog is operator guidance, not a substitute for upstream advisories.

Guard coverage and policy

What Guard's reviewed assertions do and do not claim for this campaign, and the reviewed starting points for defense.

No Guard coverage mapping or campaign-specific policy guidance is published for this record.

Safe next step. Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.

Open policy controlsCampaign-specific emergency policy starting point

Timeline

Reviewed events, oldest first, each tied to a verified source.

  1. Disclosure

    CVE-2026-0799 disclosed for libpcap BPF/rpcap memory walk.

    Sources:NVD CVE-2026-0799·CVE Record CVE-2026-0799

  2. Update

    HOL Guard published operator blog coverage for CVE-2026-0799.

    Source:HOL Guard operator write-up

Publication clock: 380.0 hours from reviewed disclosure timestamp to HOL publication; 12-hour critical target; historical backfill outside target.

Reviewed artifacts

The specific artifacts this record concerns, as reviewed. Names and versions are shown as text; a registry link is not recorded here.

  • libpcapgenericpackage

Sources

Every claim on this record is traceable to the sources below.

Campaign questions, answered

Crafted BPF filters can cause libpcap to walk process memory (rpcap / filter handling). Operators should upgrade to the fixed libpcap release cited by the vendor/NVD for their train. HOL Guard tracked the campaign from Sep 5, 2026 to Sep 5, 2026.

No. Active tracking ended Sep 5, 2026; this page remains as a labeled historical research record and does not imply the threat is currently active.

The record cites 3 primary sources, names 1 reviewed artifact, and was last fully reviewed Sep 20, 2026 by HOL Guard Security Publishing. Its uncertainty and limitations are stated on the record itself.

Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.

The permalink above is permanent. The full record can be downloaded from this page as JSON, an artifact CSV, and a STIX 2.1 bundle, and corrections can be requested through the published correction path on the record. Exact fixed version must be confirmed against NVD/vendor for your libpcap package train.

Reviewed in full by HOL Guard Security Publishing.

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Record HGTC-2026-26BFDFE4