Description
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.
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 26.04 LTS | libpcap | 1.10.6-1ubuntu1.1 | USN-8824-1 |
| Ubuntu 24.04 LTS | libpcap | 1.10.4-4.1ubuntu3.1 | USN-8824-1 |
| Ubuntu 22.04 LTS | libpcap | 1.10.1-4ubuntu1.22.04.2 | USN-8824-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libpcap | 1.9.1-3ubuntu1.20.04.1+esm1 | USN-8824-1 |
| Ubuntu Pro 18.04 LTS | libpcap | 1.8.1-6ubuntu1.18.04.2+esm1 | USN-8824-1 |
| Ubuntu Pro 16.04 LTS | libpcap | 1.7.4-2ubuntu0.1+esm1 | USN-8824-1 |
| Ubuntu Pro 14.04 LTS | libpcap | 1.5.3-2ubuntu0.1+esm1 | USN-8824-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | libpcap +1 | 14:1.10.4-7.el10_2.1 | RHSA-2026:74442 |
| RHEL 9 | libpcap +1 | 14:1.10.0-4.el9_8.1 | RHSA-2026:74441 |
| RHEL 8 | libpcap +1 | 14:1.9.1-6.el8_10 | RHSA-2026:76045 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | libpcap +1 | 14:1.10.4-7.el10_2.1 | ALSA-2026:74442 |
| AlmaLinux 9 | libpcap +1 | 14:1.10.0-4.el9_8.1 | ALSA-2026:74441 |
| AlmaLinux 8 | libpcap +1 | 14:1.9.1-6.el8_10 | ALSA-2026:76045 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | libpcap | 4:1.10.4-7.el10_2.1 | RLSA-2026:74442 |
| Rocky Linux 9 | libpcap | 4:1.10.0-4.el9_8.1 | RLSA-2026:74441 |
| Rocky Linux 8 | libpcap | 4:1.9.1-6.el8_10 | RLSA-2026:76045 |
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 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | libpcap +1 | 14:1.10.4-7.el10_2.1 | ELSA-2026-74442 |
| Oracle Linux 9 | libpcap +1 | 14:1.10.0-4.el9_8.1 | ELSA-2026-74441 |
| Oracle Linux 8 | libpcap +1 | 14:1.9.1-6.el8_10 | ELSA-2026-76045 |
Advisories 26
- WID-SEC-2026-3691 Red Hat Enterprise Linux (libpcap): Schwachstelle ermöglicht Offenlegung von Informationen und Codeausführung BSI CERT-Bund (WID) · Nov 3, 2026
- ALSA-2026:74441 Important: libpcap security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:74442 Important: libpcap security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:76045 Important: libpcap security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:76045 Red Hat Security Advisory: libpcap security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:74442 Red Hat Security Advisory: libpcap security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:74441 Red Hat Security Advisory: libpcap security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RLSA-2026:76045 Important: libpcap security update Rocky Linux Security Advisories · Oct 7, 2026
- ELSA-2026-76045 Important: libpcap security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 5, 2026
- RLSA-2026:74442 Important: libpcap security update Rocky Linux Security Advisories · Oct 2, 2026
- RLSA-2026:74441 Important: libpcap security update Rocky Linux Security Advisories · Oct 2, 2026
- ELSA-2026-74442 Important: libpcap security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Oct 1, 2026
- ELSA-2026-74441 Important: libpcap security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 1, 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
- USN-8824-1 libpcap vulnerability Ubuntu Security Notices (USN) · 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