| Name | CVE-2021-20177 |
| Description | A flaw was found in the Linux kernel's implementation of string matching within a packet. A privileged user (with root or CAP_NET_ADMIN) when inserting iptables rules could insert a rule which can panic the system. Kernel before kernel 5.5-rc1 is affected. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2557-1, DSA-4843-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| linux (PTS) | bullseye | 5.10.223-1 | fixed |
| bullseye (security) | 5.10.237-1 | fixed |
| bookworm | 6.1.137-1 | fixed |
| bookworm (security) | 6.1.140-1 | fixed |
| trixie | 6.12.33-1 | fixed |
| trixie (security) | 6.12.31-1 | fixed |
| sid | 6.12.35-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[stretch] - linux <not-affected> (Vulnerable code not present)
https://bugzilla.kernel.org/show_bug.cgi?id=209823
https://www.openwall.com/lists/oss-security/2021/01/12/1