CVE-2021-3930: debian debian_linux Off-by-one Error
Vulnerability summary
CVE-2021-3930 is a medium (CVSS 6.5) Off-by-one Error vulnerability in debian debian_linux. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 27.3% of scored vulnerabilities.
Not severe (CVSS 6.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 11 · Related 7Timeline
- 18-02-2022PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.
CVSS metrics
6 scores · 5 sources · 2 versions- OSV · Red hatEcosystem advisory · calculated3.2LowCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:LDiffers
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- OSV · AlpineEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS trend
Probability
0.34%
Chance of exploitation in the next 30 days
Percentile
27%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.34% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat195 products
- codeready_linux_builder8.0
- codeready_linux_builder_for_ibm_z_systems8.0
- codeready_linux_builder_for_power_little_endian8.0
- enterprise_linux8.0
- enterprise_linux_advanced_virtualization_eus8.4
Debian2 products
- qemu< 1:6.2+dfsg-1
- debian_linuxEOL9.0 | 10.0
Alpine1 product
- qemu< 6.1.1-r0
Qemu1 product
- qemu< 6.2.0
Ubuntu1 product
- qemu< 2.0.0+dfsg-2ubuntu1.47+esm2 | < 1:2.5+dfsg-5ubuntu10.51+esm1 | < 1:2.11+dfsg-1ubuntu7.39 | < 1:4.2-3ubuntu6.21 | < 1:6.2+dfsg-2ubuntu5
5 vendors · 200 products · Showing 200 of 247
References
17 links
lists.debian.org/debian-lts-announce/2022/04/msg00002.htmlMailing ListX Refsource MLISTThird Party Advisory- lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing ListX Refsource MLISTThird Party Advisory
