CVE-2021-4090 — Out-of-bounds Write in Kernel
Severity
7.1HIGHNVD
OSV6.5OSV4.7
EPSS
0.1%
top 80.77%
CISA KEV
Not in KEV
Exploit
No known exploits
Timeline
PublishedFeb 18
Latest updateApr 1
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NExploitability: 1.8 | Impact: 5.2
Affected Packages6 packages
Patches
🔴Vulnerability Details
5GHSA▶
GHSA-rwxr-f4qj-9x36: An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel↗2022-02-19
OSV▶
CVE-2021-4090: An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel↗2022-02-18
OSV▶
linux, linux-aws, linux-aws-5.11, linux-aws-5.13, linux-azure-5.11, linux-gcp, linux-gcp-5.11, linux-hwe-5.13, linux-kvm, linux-oem-5.13, linux-oracle, linux-oracle-5.11, linux-raspi vulnerabilities↗2022-02-03
📋Vendor Advisories
6Microsoft▶
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 ↗2022-02-08