Ubuntu.comUB:CVE-2021-4090CVE-2021-4090
6.6 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:C/I:C/A:N
7.1 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
0.0004 Low
EPSS
Percentile
5.1%
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.
Notes
| Author | Note |
|---|---|
| sbeattie | reproducer in initial report email |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 21.10 | noarch | linux | < 5.13.0-28.31 | UNKNOWN |
| ubuntu | 21.10 | noarch | linux-aws | < 5.13.0-1012.13 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-aws-5.11 | < 5.11.0-1028.31~20.04.1 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-aws-5.13 | < 5.13.0-1012.13~20.04.1 | UNKNOWN |
| ubuntu | 21.10 | noarch | linux-azure | < 5.13.0-1013.15 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-azure-5.11 | < 5.11.0-1028.31~20.04.2 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-azure-5.13 | < 5.13.0-1013.15~20.04.1 | UNKNOWN |
| ubuntu | 21.10 | noarch | linux-gcp | < 5.13.0-1013.16 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-gcp-5.11 | < 5.11.0-1029.33~20.04.3 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-gcp-5.13 | < 5.13.0-1013.16~20.04.1 | UNKNOWN |
References
bugzilla.redhat.com/show_bug.cgi?id=2025101
git.kernel.org/linus/c0019b7db1d7ac62c711cda6b357a659d46428fe (5.16-rc2)
launchpad.net/bugs/cve/CVE-2021-4090
lore.kernel.org/linux-nfs/[email protected]/
nvd.nist.gov/vuln/detail/CVE-2021-4090
security-tracker.debian.org/tracker/CVE-2021-4090
ubuntu.com/security/notices/USN-5217-1
ubuntu.com/security/notices/USN-5265-1
ubuntu.com/security/notices/USN-5362-1
www.cve.org/CVERecord?id=CVE-2021-4090
Related
6.6 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:C/I:C/A:N
7.1 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
0.0004 Low
EPSS
Percentile
5.1%