| 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, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more) |
| References | DLA-2557-1, DSA-4843-1 |
| NVD severity | low |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | stretch | 4.9.228-1 | fixed |
| stretch (security) | 4.9.272-2 | fixed | |
| buster | 4.19.194-1 | fixed | |
| buster (security) | 4.19.194-3 | fixed | |
| bookworm, bullseye | 5.10.46-4 | fixed | |
| sid | 5.14.6-2 | fixed | |
| linux-4.19 (PTS) | stretch (security) | 4.19.194-3~deb9u1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | stretch | (not affected) | |||
| linux | source | buster | 4.19.171-2 | DSA-4843-1 | ||
| linux | source | (unstable) | 5.5.13-1 | |||
| linux-4.19 | source | stretch | 4.19.171-2~deb9u1 | DLA-2557-1 |
[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