CVE-2021-3653: debian debian_linux Missing Authorization

Modified

AliasesRHSA-2021:3547RHSA-2021:3548UBUNTU-CVE-2021-3653+2 more

Published 29-09-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-3653 is a high (CVSS 8.8) Missing Authorization vulnerability in debian debian_linux. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 38.9% of scored vulnerabilities. 1 public exploit is recorded.

Priority

Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?

CVSS score

8.8/10

010

High · v3.1 (NVD)

EPSS score

0.45%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 48 · Related 31

Timeline

29-09-2021
PublishedVulnerability first disclosed.
03-08-2024
Last modifiedVulnerability information updated.

Description

A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "int_ctl" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape. This flaw affects Linux kernel versions prior to 5.14-rc7.

CVSS metrics

5 scores · 4 sources · 2 versions

v3.18.8v2.06.1

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.45% 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

1 found

referenceUnverified
Exploit Reference (packetstormsecurity.com)
Maturity: unknown

Weaknesses

CWE · root cause

CWE-862Missing AuthorizationThe product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Affected systems

Version check

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

Ubuntu55 products

linuxAll versions (No fix recorded) | < 4.4.0-214.246 | < 4.15.0-156.163 | < 5.4.0-84.94
linux-aws< 4.4.0-1096.101 | < 4.4.0-1132.146 | < 4.15.0-1111.118 | < 5.4.0-1056.59
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11< 5.11.0-1017.18~20.04.1
linux-aws-5.3All versions (No fix recorded)

linux-aws-5.4< 5.4.0-1056.59~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-fips< 4.15.0-2053.55 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1111.118~16.04.1
linux-azure< 4.15.0-1123.136~14.04.1 | < 4.15.0-1123.136~16.04.1 | All versions (No fix recorded) | < 5.4.0-1058.60
linux-azure-4.15< 4.15.0-1123.136
linux-azure-5.11< 5.11.0-1015.16~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1058.60~18.04.1
linux-azure-5.8< 5.8.0-1041.44~20.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fips< 4.15.0-2035.39 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-bluefield< 5.4.0-1019.22
linux-dell300x< 4.15.0-1027.32
linux-fips< 4.4.0-1066.72 | All versions (No fix recorded) | < 4.15.0-1069.78 | < 5.4.0-1033.38
linux-gcp< 4.15.0-1108.122~16.04.1 | All versions (No fix recorded) | < 5.4.0-1052.56
linux-gcp-4.15< 4.15.0-1108.122
linux-gcp-5.11< 5.11.0-1018.20~20.04.2
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1052.56~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-edgeAll versions (No fix recorded)
linux-gcp-fips< 4.15.0-2018.20 | All versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke< 5.4.0-1052.55
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1052.55~18.04.1
linux-gkeop< 5.4.0-1023.24
linux-gkeop-5.4< 5.4.0-1023.24~18.04.1
linux-hwe< 4.15.0-156.163~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11< 5.11.0-34.36~20.04.1
linux-hwe-5.4< 5.4.0-84.94~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.4.0-1097.106 | < 4.15.0-1099.101 | < 5.4.0-1046.48
linux-lts-xenial< 4.4.0-214.246~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1045.47
linux-oem-5.13< 5.13.0-1012.16
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1080.88~16.04.1 | < 4.15.0-1080.88 | < 5.4.0-1054.58
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11< 5.11.0-1017.18~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1054.58~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi-realtimeAll versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscv-5.11< 5.11.0-1018.19~20.04.2
linux-snapdragon< 4.15.0-1112.121

Show all 55

Redhat51 products

enterprise_linuxEOL7.0
bpftool< 0:4.18.0-305.19.1.el8_4
bpftool-debuginfo< 0:4.18.0-305.19.1.el8_4
kernel< 0:4.18.0-305.19.1.el8_4
kernel-abi-stablelists< 0:4.18.0-305.19.1.el8_4

kernel-core< 0:4.18.0-305.19.1.el8_4
kernel-cross-headers< 0:4.18.0-305.19.1.el8_4
kernel-debug< 0:4.18.0-305.19.1.el8_4
kernel-debug-core< 0:4.18.0-305.19.1.el8_4
kernel-debug-debuginfo< 0:4.18.0-305.19.1.el8_4
kernel-debug-devel< 0:4.18.0-305.19.1.el8_4
kernel-debug-modules< 0:4.18.0-305.19.1.el8_4
kernel-debug-modules-extra< 0:4.18.0-305.19.1.el8_4
kernel-debuginfo< 0:4.18.0-305.19.1.el8_4
kernel-debuginfo-common-aarch64< 0:4.18.0-305.19.1.el8_4
kernel-debuginfo-common-ppc64le< 0:4.18.0-305.19.1.el8_4
kernel-debuginfo-common-s390x< 0:4.18.0-305.19.1.el8_4
kernel-debuginfo-common-x86_64< 0:4.18.0-305.19.1.el8_4
kernel-devel< 0:4.18.0-305.19.1.el8_4
kernel-doc< 0:4.18.0-305.19.1.el8_4
kernel-modules< 0:4.18.0-305.19.1.el8_4
kernel-modules-extra< 0:4.18.0-305.19.1.el8_4
kernel-rt< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-core< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-debug< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-debug-core< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-debug-debuginfo< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-debug-devel< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-debug-kvm< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-debug-modules< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-debug-modules-extra< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-debuginfo< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-debuginfo-common-x86_64< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-devel< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-kvm< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-modules< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-rt-modules-extra< 0:4.18.0-305.19.1.rt7.91.el8_4
kernel-tools< 0:4.18.0-305.19.1.el8_4
kernel-tools-debuginfo< 0:4.18.0-305.19.1.el8_4
kernel-tools-libs< 0:4.18.0-305.19.1.el8_4
kernel-tools-libs-devel< 0:4.18.0-305.19.1.el8_4
kernel-zfcpdump< 0:4.18.0-305.19.1.el8_4
kernel-zfcpdump-core< 0:4.18.0-305.19.1.el8_4
kernel-zfcpdump-debuginfo< 0:4.18.0-305.19.1.el8_4
kernel-zfcpdump-devel< 0:4.18.0-305.19.1.el8_4
kernel-zfcpdump-modules< 0:4.18.0-305.19.1.el8_4
kernel-zfcpdump-modules-extra< 0:4.18.0-305.19.1.el8_4
perf< 0:4.18.0-305.19.1.el8_4
perf-debuginfo< 0:4.18.0-305.19.1.el8_4
python3-perf< 0:4.18.0-305.19.1.el8_4
python3-perf-debuginfo< 0:4.18.0-305.19.1.el8_4

Show all 51

Debian2 products

linux< 5.14.6-1
debian_linuxEOL9.0

Linux1 product

linux_kernel≥ 2.6.30, < 4.4.282 | ≥ 4.5, < 4.9.281 | ≥ 4.10, < 4.14.245 | ≥ 4.15, < 4.19.205 | ≥ 4.20, < 5.4.142 | ≥ 5.5, < 5.10.60 | ≥ 5.11, < 5.13.12 | 5.14:rc1 | 5.14:rc2 | 5.14:rc3 | 5.14:rc4 | 5.14:rc5 | 5.14:rc6

4 vendors · 109 products