| Name | CVE-2021-4083 |
| Description | A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system. This flaw affects Linux kernel versions prior to 5.16-rc4. |
| 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-2940-1, DLA-2941-1, DSA-5096-1, ELA-577-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | jessie, jessie (lts) | 3.16.84-1 | vulnerable |
| stretch (security) | 4.9.320-2 | fixed | |
| stretch (lts), stretch | 4.9.320-3 | fixed | |
| buster (security), buster, buster (lts) | 4.19.316-1 | fixed | |
| bullseye | 5.10.223-1 | fixed | |
| bullseye (security) | 5.10.226-1 | fixed | |
| bookworm | 6.1.115-1 | fixed | |
| bookworm (security) | 6.1.119-1 | fixed | |
| trixie | 6.12.5-1 | fixed | |
| sid | 6.12.6-1 | fixed | |
| linux-4.19 (PTS) | stretch (security) | 4.19.232-1~deb9u1 | fixed |
| stretch (lts), stretch | 4.19.316-1~deb9u1 | fixed | |
| linux-4.9 (PTS) | jessie, jessie (lts) | 4.9.303-1~deb8u3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | jessie | (unfixed) | end-of-life | ||
| linux | source | stretch | 4.9.303-1 | DLA-2940-1 | ||
| linux | source | buster | 4.19.232-1 | DSA-5096-1 | ||
| linux | source | bullseye | 5.10.84-1 | |||
| linux | source | (unstable) | 5.15.5-2 | |||
| linux-4.19 | source | stretch | 4.19.232-1~deb9u1 | DLA-2941-1 | ||
| linux-4.9 | source | jessie | 4.9.303-1~deb8u1 | ELA-577-1 |
https://git.kernel.org/linus/054aa8d439b9185d4f5eb9a90282d1ce74772969 (5.16-rc4)
https://bugs.chromium.org/p/project-zero/issues/detail?id=2247