CVE-2021-3501: fedoraproject fedora Out-of-bounds Write
CVSS: 7.1v3.1HighModified
AliasesRHSA-2021:2165UBUNTU-CVE-2021-3501DEBIAN-CVE-2021-3501
Published 05-05-2021Last modified 05-08-2026
Vulnerability summary
CVE-2021-3501 is a high (CVSS 7.1) Out-of-bounds Write vulnerability in fedoraproject fedora. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.1% of scored vulnerabilities.
CVSS score
7.1/10
010
High · v3.1 (NVD)EPSS score
0.38%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 4 · Related 1Timeline
- 05-05-2021PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability.
CVSS metrics
5 scores · 4 sources · 2 versionsHigh 7.1Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:HSources4 sources · 7.1–7.8
- OSV · Red hatEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Low 3.6Preferred score · NVD (NIST)
AV:L/AC:L/Au:N/C:N/I:P/A:PSourcesSingle source
EPSS trend
Probability
0.38%
Chance of exploitation in the next 30 days
Percentile
30%
Versus all other CVEs
30-day change
0.00 pp
From 0.37% on 18-09-2026
18-09-202618-10-2026
EPSS score0.38%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu17 products
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.3All versions (No fix recorded)
- linux-azureAll versions (No fix recorded)
- linux-azure-5.3All versions (No fix recorded)
- linux-azure-edgeAll versions (No fix recorded)
Redhat10 products
- enterprise_linux8.0
- enterprise_linux_for_real_time8
- enterprise_linux_for_real_time_for_nfv8
- enterprise_linux_for_real_time_for_nfv_tus8.4
- enterprise_linux_for_real_time_tus8.4
Linux2 products
- kernel≥ 5.9, < 5.10.32 | ≥ 5.11, < 5.11.16
- linux_kernel< 5.12
Debian1 product
- linux< 5.10.38-1
Fedoraproject1 product
- fedoraEOL33
6 vendors · 41 products
References
14 links- bugzilla.redhat.com/show_bug.cgi?id=1950136X Refsource MISCREPORTIssue TrackingPatchThird Party Advisory
