CVE-2021-33033

high
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.

References

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8

https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopt

https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e

Details

Source: MITRE

Published: 2021-05-14

Updated: 2021-06-09

Type: CWE-416

Risk Information

CVSS v2

Base Score: 4.6

Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3

Base Score: 7.8

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Tenable Plugins

View all (20 total)

IDNameProductFamilySeverity
153271EulerOS 2.0 SP2 : kernel (EulerOS-SA-2021-2392)NessusHuawei Local Security Checks
high
153080EulerOS 2.0 SP5 : kernel (EulerOS-SA-2021-2336)NessusHuawei Local Security Checks
high
152327EulerOS 2.0 SP8 : kernel (EulerOS-SA-2021-2301)NessusHuawei Local Security Checks
high
152313EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2272)NessusHuawei Local Security Checks
high
152308EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2246)NessusHuawei Local Security Checks
high
152089Scientific Linux Security Update : kernel on SL7.x x86_64 (2021:2725)NessusScientific Linux Local Security Checks
high
151979CentOS 7 : kernel (CESA-2021:2725)NessusCentOS Local Security Checks
high
151926Oracle Linux 7 : kernel (ELSA-2021-2725)NessusOracle Linux Local Security Checks
high
151888RHEL 7 : kernel (RHSA-2021:2725)NessusRed Hat Local Security Checks
high
151886RHEL 7 : kernel-rt (RHSA-2021:2726)NessusRed Hat Local Security Checks
high
151690Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2021-9362)NessusOracle Linux Local Security Checks
high
151689Oracle Linux 7 / 8 : Unbreakable Enterprise kernel-container (ELSA-2021-9363)NessusOracle Linux Local Security Checks
high
151570EulerOS Virtualization 2.9.0 : kernel (EulerOS-SA-2021-2195)NessusHuawei Local Security Checks
high
151562EulerOS Virtualization 2.9.1 : kernel (EulerOS-SA-2021-2183)NessusHuawei Local Security Checks
high
151529Oracle Linux 7 : Unbreakable Enterprise kernel-container (ELSA-2021-9351)NessusOracle Linux Local Security Checks
high
151506Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2021-9349)NessusOracle Linux Local Security Checks
high
151307EulerOS Virtualization for ARM 64 3.0.2.0 : kernel (EulerOS-SA-2021-2075)NessusHuawei Local Security Checks
high
150292Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4984-1)NessusUbuntu Local Security Checks
medium
150155Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4979-1)NessusUbuntu Local Security Checks
medium
149872Amazon Linux AMI : kernel (ALAS-2021-1503)NessusAmazon Linux Local Security Checks
high