CVE-2026-31911

abort() in libpcap before 1.10.7 on an invalid BPF opcode

CVE-2026-31911 is fixed in 4 products on 1 platform, first by FEDORA-2026-4401B94AD0, released September 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.5

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0011

1st percentile

libpcap BPF interpreter calls abort() if it encounters a BPF instruction that has an invalid opcode. In particular uncommon use cases a crafted filter program can terminate the OS process.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
libpcap · Debian 14	1.10.7-1	DEBIAN-CVE-2026-31911	Sep 14, 2026
libpcap · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026
libpcap · amzn 2023	14:1.10.7-1.amzn2023.0.1	ALAS2023-2026-3100	Sep 28, 2026
libpcap · opensuse-leap 16.0	1.10.5-160000.5.1	OPENSUSE-SU-2026:21940-1	Sep 23, 2026
libpcap · sles 15.6	1.10.4-150600.3.12.1	SUSE-SU-2026:4194-1	Sep 15, 2026
libpcap · sles 15.7	1.10.5-150700.3.13.1	SUSE-SU-2026:4188-1	Sep 15, 2026
libpcap · sles 16.0	1.10.5-160000.5.1	SUSE-SU-2026:23907-1	Sep 23, 2026
libpcap-debuginfo · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026
libpcap-debuginfo · amzn 2023	14:1.10.7-1.amzn2023.0.1	ALAS2023-2026-3100	Sep 28, 2026
libpcap-debugsource · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026
libpcap-debugsource · amzn 2023	14:1.10.7-1.amzn2023.0.1	ALAS2023-2026-3100	Sep 28, 2026
libpcap-devel · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026
libpcap-devel · amzn 2023	14:1.10.7-1.amzn2023.0.1	ALAS2023-2026-3100	Sep 28, 2026

Details

Published
September 5, 2026
Weakness
Reachable Assertion
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31911

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