CVE-2021-20261
Reported by redhat · Published March 11, 2021
A race condition was found in the Linux kernels implementation of the floppy disk drive controller driver software. The impact of this issue is lessened by the fact that the default permissions on the floppy device (/dev/fd0) are restricted to root. If the permissions on the device have changed the impact changes greatly. In the default configuration root (or equivalent) permissions are required to attack this flaw.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| linux-lts-xenial | Ubuntu:Pro:14.04:LTS | 4.4.0-208.240~14.04.1 |
| linux-aws | Ubuntu:Pro:14.04:LTS | 4.4.0-1090.94 |
| linux-raspi2 | Ubuntu:16.04:LTS | 4.4.0-1150.161 |
| linux-aws | Ubuntu:16.04:LTS | 4.4.0-1126.140 |
| linux_kernel | linux | 4.5 |
| linux-snapdragon | Ubuntu:18.04:LTS | 4.15.0-1053.57 |
| linux-kvm | Ubuntu:16.04:LTS | 4.4.0-1091.100 |
| linux-fips | Ubuntu:Pro:FIPS:16.04:LTS | 4.4.0-1060.66 |
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | kernel | kernel 5.12-rc2 |
| n/a | kernel | 5.12-rc2 |
Timeline
- Mar 11, 2021 CVE Published
- Mar 12, 2021 PoC Published (2 in total, the first dated here)
- Apr 14, 2021 EPSS Score (30 in total, the first dated here)
- Mar 7, 2026 Distribution Patch (6 in total, the first dated here)
- Mar 7, 2026 Security Advisory (7 in total, the first dated here)
- Aug 27, 2026 Coalition ESS Score
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2021-20261
vulnetix vdb fixes CVE-2021-20261Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
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