Description
libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations. A crafted filter program or the 'protochain' primitive used on a crafted network packet can cause the interpreter to loop infinitely.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The Tcpdump Group | libpcap | < 1.10.7 | 1.10.7 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libpcap | 1.10.7-1 | — |
| Debian 13 | libpcap | No fix yet | — |
| Debian 12 | libpcap | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libpcap | No fix yet | — |
| Ubuntu 26.04 LTS | libpcap | No fix yet | — |
| Ubuntu 24.04 LTS | libpcap | No fix yet | — |
| Ubuntu 22.04 LTS | libpcap | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libpcap | No fix yet | — |
| Ubuntu Pro 18.04 LTS | libpcap | No fix yet | — |
| Ubuntu Pro 16.04 LTS | libpcap | No fix yet | — |
| Ubuntu Pro 14.04 LTS | libpcap | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libpcap | 1.10.5-150700.3.13.1 | SUSE-SU-2026:4188-1 |
| SLES 15 SP6 | libpcap | 1.10.4-150600.3.12.1 | SUSE-SU-2026:4194-1 |
| SLES 15 SP5 | libpcap | 1.10.1-150400.3.12.1 | SUSE-SU-2026:4195-1 |
| SLES 15 SP4 | libpcap | 1.10.1-150400.3.12.1 | SUSE-SU-2026:4195-1 |
| SLES 12 SP5 | libpcap | 1.8.1-10.12.1 | SUSE-SU-2026:4239-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libpcap | 1.10.5-160000.5.1 | SUSE-SU-2026:23907-1 |
| SLES for SAP 15 SP6 | libpcap | 1.10.4-150600.3.12.1 | SUSE-SU-2026:4194-1 |
| SLES for SAP 15 SP5 | libpcap | 1.10.1-150400.3.12.1 | SUSE-SU-2026:4195-1 |
| SLES for SAP 15 SP4 | libpcap | 1.10.1-150400.3.12.1 | SUSE-SU-2026:4195-1 |
| SLES 16.0 | libpcap | 1.10.5-160000.5.1 | SUSE-SU-2026:23907-1 |
| SLE Micro 6.2 | libpcap | 1.10.5-160000.5.1 | SUSE-SU-2026:23892-1 |
| SLE Micro 6.1 | libpcap | 1.10.4-slfo.1.1_3.1 | SUSE-SU-2026:23737-1 |
| SLE Micro 6.0 | libpcap | 1.10.4-5.1 | SUSE-SU-2026:23829-1 |
| SLE Micro 5.5 | libpcap | 1.10.1-150400.3.12.1 | SUSE-SU-2026:4195-1 |
| SLE Micro 5.4 | libpcap | 1.10.1-150400.3.12.1 | SUSE-SU-2026:4195-1 |
| SLE Micro 5.3 | libpcap | 1.10.1-150400.3.12.1 | SUSE-SU-2026:4195-1 |
| SLE HPC 15 SP5 | libpcap | 1.10.1-150400.3.12.1 | SUSE-SU-2026:4195-1 |
| SLE HPC 15 SP4 | libpcap | 1.10.1-150400.3.12.1 | SUSE-SU-2026:4195-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libpcap | 1.10.7-1.1 | openSUSE-SU-2026:11744-1 |
| openSUSE Leap 16.0 | libpcap | 1.10.5-160000.5.1 | openSUSE-SU-2026:21940-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libpcap | 1.10.7-r0 | — |
| Alpine v3.23 | libpcap | 1.10.7-r0 | — |
| Alpine v3.22 | libpcap | 1.10.7-r0 | — |
| Alpine v3.21 | libpcap | 1.10.7-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libpcap +1 | 14:1.10.7-1.amzn2023.0.1 | ALAS2023-2026-3100 |
| Amazon Linux 2 | libpcap +1 | 14:1.5.3-11.amzn2.0.1 | ALAS2-2026-3927 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libpcap | 1.10.7-1 | — |
| Azure Linux 3 | nmap | No fix yet | — |
Advisories 13
- WID-SEC-2026-4542 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- SUSE-SU-2026:23907-1 Security update for libpcap SUSE / openSUSE Security Updates · Sep 30, 2026
- SUSE-SU-2026:23892-1 Security update for libpcap SUSE / openSUSE Security Updates · Sep 30, 2026
- ALAS2023-2026-3100 Important: libpcap security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 28, 2026
- ALAS2-2026-3927 Important: libpcap security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Sep 28, 2026
- SUSE-SU-2026:23829-1 Security update for libpcap SUSE / openSUSE Security Updates · Sep 27, 2026
- SUSE-SU-2026:23737-1 Security update for libpcap SUSE / openSUSE Security Updates · Sep 27, 2026
- openSUSE-SU-2026:21940-1 Security update for libpcap SUSE / openSUSE Security Updates · Sep 25, 2026
- SUSE-SU-2026:4239-1 Security update for libpcap SUSE / openSUSE Security Updates · Sep 17, 2026
- SUSE-SU-2026:4188-1 Security update for libpcap SUSE / openSUSE Security Updates · Sep 16, 2026
- SUSE-SU-2026:4194-1 Security update for libpcap SUSE / openSUSE Security Updates · Sep 16, 2026
- SUSE-SU-2026:4195-1 Security update for libpcap SUSE / openSUSE Security Updates · Sep 16, 2026
- openSUSE-SU-2026:11744-1 libpcap-devel-1.10.7-1.1 on GA media SUSE / openSUSE Security Updates · Sep 11, 2026