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Fencer Vulns
high 8.7

CVE-2026-0799 json

OOBR and OOBW in libpcap before 1.10.7

published 2026-09-05 2 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-72015

cvss
8.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading and writing the OS process memory in the 16GiB starting at the current stack frame on 64-bit architectures and in the entire address space on 32-bit architectures.

Patch / fix

  • The Tcpdump Group libpcap 1.10.7
  • libpcap Debian 14 1.10.7-1

debian advisories DEBIAN-CVE-2026-0799

  • libpcap Ubuntu 22.04 LTS 1.10.1-4ubuntu1.22.04.2
  • libpcap Ubuntu 24.04 LTS 1.10.4-4.1ubuntu3.1
  • libpcap Ubuntu 26.04 LTS 1.10.6-1ubuntu1.1
  • libpcap Ubuntu Pro 14.04 LTS 1.5.3-2ubuntu0.1+esm1
  • libpcap Ubuntu Pro 16.04 LTS 1.7.4-2ubuntu0.1+esm1
  • libpcap Ubuntu Pro 18.04 LTS 1.8.1-6ubuntu1.18.04.2+esm1
  • libpcap Ubuntu Pro 20.04 LTS 1.9.1-3ubuntu1.20.04.1+esm1

ubuntu advisories UBUNTU-CVE-2026-0799

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libpcap RHEL 8 14:1.9.1-6.el8_10
  • libpcap RHEL 9 14:1.10.0-4.el9_8.1
  • libpcap RHEL 10.2 14:1.10.4-7.el10_2.1

red hat advisories RHSA-2026:76045RHSA-2026:74441RHSA-2026:74442

  • libpcap SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.10.5-160000.5.1
  • libpcap SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 1.10.1-150400.3.12.1
  • libpcap SLE Module for Package Hub 15 SP7, SLE Module for Basesystem 15 SP7 1.10.5-150700.3.13.1
  • libpcap Linux Micro 6.1 1.10.4-slfo.1.1_3.1
  • libpcap Linux Micro 6.0 1.10.4-5.1
  • libpcap SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.8.1-10.12.1
  • libpcap SLES for SAP 15 SP6, SLES 15 SP6-LTSS 1.10.4-150600.3.12.1

suse advisories SUSE-SU-2026:23892-1SUSE-SU-2026:23907-1SUSE-SU-2026:4239-1SUSE-SU-2026:4195-1SUSE-SU-2026:4194-1SUSE-SU-2026:4188-1

  • libpcap openSUSE Leap 16.0 1.10.5-160000.5.1
  • libpcap openSUSE Tumbleweed 1.10.7-1.1

opensuse advisories openSUSE-SU-2026:21940-1openSUSE-SU-2026:11744-1

  • libpcap AlmaLinux 8 14:1.9.1-6.el8_10
  • libpcap AlmaLinux 9 14:1.10.0-4.el9_8.1
  • libpcap AlmaLinux 10 14:1.10.4-7.el10_2.1

almalinux advisories ALSA-2026:76045ALSA-2026:74441ALSA-2026:74442

  • libpcap Rocky Linux 8 4:1.9.1-6.el8_10
  • libpcap Rocky Linux 10 4:1.10.4-7.el10_2.1
  • libpcap Rocky Linux 9 4:1.10.0-4.el9_8.1

rocky linux advisories RLSA-2026:76045RLSA-2026:74442RLSA-2026:74441

  • libpcap Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 1.10.7-r0

alpine advisories ALPINE-CVE-2026-0799

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libpcap Azure Linux 3.0 1.10.7-1

azure linux advisories AZL-99744

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-0799 updated cvss 8.7

libpcap: libpcap: Out-of-bounds read and write vulnerability allows arbitrary memory access

  • Red Hat Enterprise Linux 6 libpcap Red Hat Enterprise Linux 7 libpcap Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: no fix available
  • Red Hat Enterprise Linux BaseOS (v. 8) libpcap 1.9.1-6.el8_10
    fixed: vendor fix RHSA-2026:76045
  • Red Hat Enterprise Linux BaseOS (v. 9) libpcap 1.10.0-4.el9_8.1
    fixed: vendor fix RHSA-2026:74441
  • Red Hat Enterprise Linux BaseOS (v. 10) libpcap 1.10.4-7.el10_2.1
    fixed: vendor fix RHSA-2026:74442
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libpcap-devel 1.10.0-4.el9_8.1, libpcap-debuginfo 1.10.0-4.el9_8.1, libpcap-debugsource 1.10.0-4.el9_8.1
    fixed: vendor fix RHSA-2026:74441
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libpcap-devel 1.10.4-7.el10_2.1, libpcap-debuginfo 1.10.4-7.el10_2.1, libpcap-debugsource 1.10.4-7.el10_2.1
    fixed: vendor fix RHSA-2026:74442
  • Red Hat Enterprise Linux CRB (v. 8) libpcap-devel 1.9.1-6.el8_10, libpcap-debuginfo 1.9.1-6.el8_10, libpcap-debugsource 1.9.1-6.el8_10
    fixed: vendor fix RHSA-2026:76045
  • Red Hat OpenShift Container Platform 4.22 rhcos 4.22.9.8.202610241758
    fixed: vendor fix RHSA-2026:89197
show 2 more
  • Red Hat Update Infrastructure 5 rhui5/rhua-rhel9 1791978693
    fixed: vendor fix RHSA-2026:82939
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1791978528, rhui5/haproxy-rhel9 1791978528, rhui5/installer-rhel9 1791964013, rhui5/cds-kubernetes-rhel9 1791978534
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.7 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H

Affected products

  • The Tcpdump Group libpcap

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.