| Name | CVE-2026-31912 |
| Description | libpcap BPF interpreter detects neither reaching the end of the filter program buffer due to lack of a return instruction nor executing a jump instruction with an offset that translates to a pointer outside of the buffer. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading the OS process memory in the 32GiB around the buffer on 64-bit architectures and in the entire address space on 32-bit architectures. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1146825 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libpcap (PTS) | bookworm | 1.10.3-1 | vulnerable |
| trixie | 1.10.5-2 | vulnerable |
| forky, sid | 1.10.7-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libpcap | source | (unstable) | 1.10.7-1 | | | 1146825 |
Notes
[trixie] - libpcap <no-dsa> (Minor issue)
[bookworm] - libpcap <postponed> (Minor issue, requires running a malicious BPF program)
Fixed by: https://github.com/the-tcpdump-group/libpcap/commit/d3f358d3cffbe1ecb94d5284b3e81f052a0adcb9 (libpcap-1.10.7)
https://www.openwall.com/lists/oss-security/2026/09/09/2