high
7.8
CWE
362 416
Advisory Published
CVE Published
CVE Published
Updated

CVE-2021-3609: Race Condition

First published: Mon Jun 14 2021(Updated: )

.A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges. This race condition in net/can/bcm.c in the Linux kernel allows for local privilege escalation to root.

Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:4.18.0-305.12.1.rt7.84.el8_4
0:4.18.0-305.12.1.rt7.84.el8_4
redhat/kernel<0:4.18.0-305.12.1.el8_4
0:4.18.0-305.12.1.el8_4
redhat/kernel<0:4.18.0-147.54.2.el8_1
0:4.18.0-147.54.2.el8_1
redhat/kernel-rt<0:4.18.0-193.64.1.rt13.115.el8_2
0:4.18.0-193.64.1.rt13.115.el8_2
redhat/kernel<0:4.18.0-193.64.1.el8_2
0:4.18.0-193.64.1.el8_2
redhat/redhat-virtualization-host<0:4.4.7-20210804.0.el8_4
0:4.4.7-20210804.0.el8_4
IBM Cloud Pak for Security<=1.7.2.0
IBM Cloud Pak for Security<=1.7.1.0
IBM Cloud Pak for Security<=1.7.0.0
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.16-1
Linux Kernel>=2.6.25<4.4.276
Linux Kernel>=4.5<4.9.276
Linux Kernel>=4.10<4.14.240
Linux Kernel>=4.15<4.19.198
Linux Kernel>=4.20<5.4.132
Linux Kernel>=5.5.0<5.10.50
Linux Kernel>=5.11<5.12.17
Linux Kernel>=5.13<5.13.2
Red Hat OpenShift API Management=2.0
Red Hat Quarkus=1.0
Red Hat CodeReady Linux Builder=8.1
Red Hat CodeReady Linux Builder=8.2
Red Hat CodeReady Linux Builder=8.4
Red Hat CodeReady Linux Builder for Power, little endian=8.1
Red Hat CodeReady Linux Builder for Power, little endian=8.2
Red Hat CodeReady Linux Builder for Power, little endian=8.4
Red Hat OpenShift Container Platform=4.6
Red Hat OpenShift Container Platform=4.7
Red Hat OpenShift Container Platform=4.8
Red Hat Enterprise Virtualization=4.0
Red Hat Virtualization Host EUS=4.0
Red Hat Enterprise Linux=8.2
Red Hat Enterprise Linux Server EUS=8.1
Red Hat Enterprise Linux Server EUS=8.2
Red Hat Enterprise Linux Server EUS=8.4
Red Hat Enterprise Linux for IBM Z Systems (s390x)=8.4
Red Hat Enterprise Linux for IBM Z Systems (s390x)=8.1
Red Hat Enterprise Linux for Power, little endian - Extended Update Support=8.1
Red Hat Enterprise Linux for Power, little endian - Extended Update Support=8.2
Red Hat Enterprise Linux for Power, little endian - Extended Update Support=8.4
Red Hat Enterprise Linux for Real Time=8.0
Red Hat Enterprise Linux for Real Time for NFV=8.0
Red Hat Enterprise Linux for Real Time for NFV=8.0
Red Hat Enterprise Linux for Real Time for NFV=8.2
Red Hat Enterprise Linux for Real Time=8.0
Red Hat Enterprise Linux for Real Time=8.2
Red Hat Enterprise Linux Server=8.2
Red Hat Enterprise Linux Server=8.4
Red Hat Enterprise Linux for SAP Applications for Power, little endian - Extended Update Support=8.1
Red Hat Enterprise Linux for SAP Applications for Power, little endian - Extended Update Support=8.2
Red Hat Enterprise Linux for SAP Applications for Power, little endian - Extended Update Support=8.4
Red Hat Enterprise Linux Server=8.2
Red Hat Enterprise Linux Server=8.4
Red Hat Enterprise Linux Server Update Services for SAP Solutions=8.1
Red Hat Enterprise Linux Server Update Services for SAP Solutions=8.2
Red Hat Enterprise Linux Server Update Services for SAP Solutions=8.4
All of
NetApp H300S Firmware
NetApp H300S Firmware
All of
NetApp H500e Firmware
NetApp H500e Firmware
All of
NetApp H700S
NetApp H700S
All of
NetApp H300E
NetApp H300E Firmware
All of
NetApp H500E
NetApp H500e Firmware
All of
NetApp H700E
NetApp H700E
All of
NetApp H410S
NetApp H410S Firmware
All of
NetApp H410C
NetApp H410C Firmware
All of
NetApp H610C
NetApp H610C Firmware
All of
NetApp H610S Firmware
NetApp H610S Firmware
All of
NetApp H615C
NetApp H615C
NetApp H300S Firmware
NetApp H300S Firmware
NetApp H500e Firmware
NetApp H500e Firmware
NetApp H700S
NetApp H700S
NetApp H300E
NetApp H300E Firmware
NetApp H500E
NetApp H500e Firmware
NetApp H700E
NetApp H700E
NetApp H410S
NetApp H410S Firmware
NetApp H410C
NetApp H410C Firmware
NetApp H610C
NetApp H610C Firmware
NetApp H610S Firmware
NetApp H610S Firmware
NetApp H615C
NetApp H615C

Remedy

As the CAN module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions: # echo "install can-bcm /bin/true" >> /etc/modprobe.d/disable-can-bcm.conf The system will need to be restarted if the CAN modules are loaded. In most circumstances, the CAN kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use. If the system requires this module to work correctly, this mitigation may not be suitable. If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.

Remedy

https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2021-3609?

    CVE-2021-3609 has been classified with a high severity level due to its potential for local privilege escalation.

  • How do I fix CVE-2021-3609?

    To mitigate CVE-2021-3609, update to the latest kernel version as specified in the remediation instructions from your vendor.

  • What types of systems are affected by CVE-2021-3609?

    CVE-2021-3609 affects various Linux kernel versions, particularly those in Red Hat and Debian distributions.

  • Can CVE-2021-3609 be exploited remotely?

    No, CVE-2021-3609 requires local access for exploitation, making it a local privilege escalation vulnerability.

  • What happens if CVE-2021-3609 is successfully exploited?

    If exploited, CVE-2021-3609 could lead to memory corruption, a system crash, or privilege escalation to root.

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