Vulnerability · Published Feb 18, 2022 · Assigned by redhat
CVE-2021-4090
High 7.1
In plain English
A high-severity out-of-bounds write in kernel from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.1High
Exploit odds (30 days)0.3%top 72.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 5.15.5-1 | DEBIAN-CVE-2021-4090 |
| Debian:13 | linux | 5.15.5-1 | DEBIAN-CVE-2021-4090 |
| Debian:14 | linux | 5.15.5-1 | DEBIAN-CVE-2021-4090 |
Affected products (as reported)
Weakness: CWE-787
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2025101
- https://lore.kernel.org/linux-nfs/163692036074.16710.5678362976688977923.stgit%40klimt.1015granger.net/
- https://security.netapp.com/advisory/ntap-20220318-0010/
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c0019b7db1d7ac62c711cda6b357a659d46428fe
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html