Buffer overflow in Linux Kernel
CVE-2021-4090
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- lore.kernel.org/linux-nfs/163692036074.16710.5678362976688977923.stgit@klimt.10…
- security.netapp.com/advisory/ntap-20220318-0010/ (Third Party Advisory)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/
Frequently asked questions
- What is CVE-2021-4090?
- CVE-2021-4090 is a high-severity vulnerability in Linux Kernel, classified under Out-of-bounds Write. CVSS score: 7.1/10. Published 2022-02-18.
- How severe is CVE-2021-4090?
- High severity. CVSS v3 base score is 7.1 out of 10.
- Is CVE-2021-4090 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.