CVE-2021-33655: debian debian_linux Out-of-bounds Write

Modified

AliasesUBUNTU-CVE-2021-33655DEBIAN-CVE-2021-33655

Published 18-07-2022Last modified 14-10-2026

Vulnerability summary

CVE-2021-33655 is a medium (CVSS 6.7) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 24.5% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 6.7, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

6.7/10

010

Medium · v3.1 (NVD)

EPSS score

0.32%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 53 · Related 46

Timeline

18-07-2022
PublishedVulnerability first disclosed.
14-10-2026
Last modifiedVulnerability information updated.

Description

When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,kernel will write memory out of bounds.

CVSS metrics

4 scores · 3 sources · 2 versions

v4.07.3v3.16.7

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

25%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.32% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.

Affected systems

Version check

Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu84 products

linuxAll versions (No fix recorded) | < 4.4.0-234.268 | < 4.15.0-193.204 | < 5.4.0-126.142 | < 5.15.0-48.54
linux-aws< 4.4.0-1113.119 | < 4.4.0-1150.165 | < 4.15.0-1141.152 | < 5.4.0-1085.92 | < 5.15.0-1020.24
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11All versions (No fix recorded)
linux-aws-5.13All versions (No fix recorded)

linux-aws-5.15< 5.15.0-1020.24~20.04.1
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1085.92~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-fips< 4.15.0-2080.85 | All versions (No fix recorded) | < 5.4.0-1085.92+fips1
linux-aws-hwe< 4.15.0-1141.152~16.04.1
linux-azure< 4.15.0-1151.166~14.04.1 | < 4.15.0-1151.166~16.04.1 | All versions (No fix recorded) | < 5.4.0-1091.96 | < 5.15.0-1020.25
linux-azure-4.15< 4.15.0-1151.166
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.15< 5.15.0-1020.25~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1091.96~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fde< 5.15.0-1024.30.1
linux-azure-fde-5.15< 5.15.0-1114.123~20.04.1
linux-azure-fips< 4.15.0-2062.68 | All versions (No fix recorded) | < 5.4.0-1091.96+fips1
linux-bluefield< 5.4.0-1046.51
linux-dell300x< 4.15.0-1053.58
linux-fips< 4.4.0-1083.90 | All versions (No fix recorded) | < 4.15.0-1098.109 | < 5.4.0-1061.69
linux-gcp< 4.15.0-1136.152~16.04.1 | All versions (No fix recorded) | < 5.4.0-1089.97 | < 5.15.0-1018.24
linux-gcp-4.15< 4.15.0-1136.152
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.15< 5.15.0-1018.24~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1089.97~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-fips< 4.15.0-2045.50 | All versions (No fix recorded) | < 5.4.0-1089.97+fips1
linux-gke< 5.4.0-1083.89 | < 5.15.0-1016.19
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.15< 5.15.0-1016.19~20.04.1
linux-gke-5.4All versions (No fix recorded)
linux-gkeop< 5.4.0-1053.56 | < 5.15.0-1003.5
linux-gkeop-5.4All versions (No fix recorded)
linux-hwe< 4.15.0-193.204~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13All versions (No fix recorded)
linux-hwe-5.15< 5.15.0-48.54~20.04.1
linux-hwe-5.4< 5.4.0-126.142~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1033.37 | < 5.15.0-1015.17
linux-ibm-5.4< 5.4.0-1033.37~18.04.1
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-intel-iotg< 5.15.0-1016.21
linux-intel-iotg-5.15< 5.15.0-1016.21~20.04.1
linux-iot< 5.4.0-1004.6
linux-kvm< 4.4.0-1114.124 | < 4.15.0-1127.132 | < 5.4.0-1075.80 | < 5.15.0-1018.22
linux-lowlatency< 5.15.0-48.54
linux-lowlatency-hwe-5.15< 5.15.0-48.54~20.04.1
linux-lts-xenial< 4.4.0-234.268~14.04.1
linux-nvidia< 5.15.0-1007.7
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.14< 5.14.0-1049.56
linux-oem-5.17< 5.17.0-1016.17
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1106.117~16.04.1 | < 4.15.0-1106.117 | < 5.4.0-1083.91 | < 5.15.0-1018.23
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11All versions (No fix recorded)
linux-oracle-5.13All versions (No fix recorded)
linux-oracle-5.15< 5.15.0-1018.23~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1083.91~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1070.80 | < 5.15.0-1015.17
linux-raspi-5.4< 5.4.0-1070.80~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1119.127 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 5.15.0-1021.21
linux-riscvAll versions (No fix recorded) | < 5.15.0-1019.22
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.15< 5.15.0-1019.22~20.04.1
linux-riscv-5.8All versions (No fix recorded)
linux-snapdragon< 4.15.0-1137.147

Show all 84

Debian2 products

linux< 5.18.14-1
debian_linuxEOL10.0 | 11.0

Linux1 product

linux_kernel< 5.19 | 5.19:rc1 | 5.19:rc2 | 5.19:rc3 | 5.19:rc4 | 5.19:rc5

3 vendors · 87 products

References

30 links

git.kernel.org/pub/…X Refsource MISCREPORTMailing ListPatchVendor Advisory
www.openwall.com/lists/oss-security/2022/07/19/2Mailing ListX Refsource MLISTPatchThird Party Advisory
www.debian.org/security/2022/dsa-5191Vendor AdvisoryX Refsource DEBIANThird Party Advisory
lists.debian.org/debian-lts-announce/2022/10/msg00000.htmlMailing ListX Refsource MLISTThird Party Advisory
ubuntu.com/security/CVE-2021-33655REPORT
ubuntu.com/security/notices/USN-5577-1Advisory
ubuntu.com/security/notices/USN-5580-1Advisory
ubuntu.com/security/notices/USN-5596-1Advisory
ubuntu.com/security/notices/USN-5621-1Advisory
ubuntu.com/security/notices/USN-5622-1Advisory

Show all 30 references

ubuntu.com/security/notices/USN-5623-1Advisory
ubuntu.com/security/notices/USN-5624-1Advisory
ubuntu.com/security/notices/USN-5630-1Advisory
ubuntu.com/security/notices/USN-5633-1Advisory
ubuntu.com/security/notices/USN-5635-1Advisory
ubuntu.com/security/notices/USN-5639-1Advisory
ubuntu.com/security/notices/USN-5640-1Advisory
ubuntu.com/security/notices/USN-5644-1Advisory
ubuntu.com/security/notices/USN-5647-1Advisory
ubuntu.com/security/notices/USN-5648-1Advisory
ubuntu.com/security/notices/USN-5650-1Advisory
ubuntu.com/security/notices/USN-5652-1Advisory
ubuntu.com/security/notices/USN-5654-1Advisory
ubuntu.com/security/notices/USN-5655-1Advisory
ubuntu.com/security/notices/USN-5660-1Advisory
ubuntu.com/security/notices/USN-5683-1Advisory
www.cve.org/CVERecord?id=CVE-2021-33655REPORT
security-tracker.debian.org/tracker/CVE-2021-33655Advisory
nvd.nist.gov/vuln/detail/CVE-2021-33655OvalAdvisory
cert-portal.siemens.com/productcert/html/ssa-794697.html