| Name | CVE-2021-20321 |
| Description | A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system. |
| 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-2843-1, DLA-2941-1, DSA-5096-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | stretch | 4.9.228-1 | vulnerable |
| stretch (security) | 4.9.303-1 | fixed | |
| buster | 4.19.235-1 | fixed | |
| buster (security) | 4.19.232-1 | fixed | |
| bullseye | 5.10.106-1 | fixed | |
| bullseye (security) | 5.10.113-1 | fixed | |
| bookworm | 5.17.3-1 | fixed | |
| sid | 5.17.6-1 | fixed | |
| linux-4.19 (PTS) | stretch (security) | 4.19.232-1~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 | 4.9.290-1 | DLA-2843-1 | ||
| linux | source | buster | 4.19.232-1 | DSA-5096-1 | ||
| linux | source | bullseye | 5.10.84-1 | |||
| linux | source | (unstable) | 5.14.12-1 | |||
| linux-4.19 | source | stretch | 4.19.232-1~deb9u1 | DLA-2941-1 |
https://git.kernel.org/linus/a295aef603e109a47af355477326bd41151765b6 (5.15-rc5)