CVE-2021-29646: Input Validation

Published Mar 15, 2021
·
Updated

A flaw buffer overflow in the Linux kernel TIPC protocol functionality was found in the way user uses protocol with encryption enabled. A local user could use this flaw to crash the system.

Other sources

An issue was discovered in the Linux kernel before 5.11.11. tipcnlretrievekey in net/tipc/node.c does not properly validate certain data sizes, aka CID-0217ed2848e8.

An issue was discovered in the Linux kernel before 5.11.11. tipcnlretrievekey in net/tipc/node.c does not properly validate certain data sizes.

Reference and upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0217ed2848e8538bcf9172d97ed2eeb4a26041bb

— Red Hat

Affected Software

7 affected componentsFixes available
redhat/kernel-rt<0:4.18.0-348.rt7.130.el8
0:4.18.0-348.rt7.130.el8
redhat/kernel<0:4.18.0-348.el8
0:4.18.0-348.el8
Linux Linux kernel<5.11.11
Fedoraproject Fedora=32
Fedoraproject Fedora=33
Fedoraproject Fedora=34
debian/linux
5.10.223-15.10.259-16.1.176-16.1.177-16.12.94-16.12.95-17.1.3-17.1.4-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-348.rt7.130.el8
  2. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-348.el8
  3. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 5.10.223-1Fixed in 5.10.259-1Fixed in 6.1.176-1Fixed in 6.1.177-1Fixed in 6.12.94-1Fixed in 6.12.95-1Fixed in 7.1.3-1Fixed in 7.1.4-1
  4. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Fixed in 5.11.11
  5. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch CID-0217ed2848e8

Event History

Mar 15, 2021
CVE Published
12:00 AM
Mar 30, 2021
CVE Published
via MITRE·08:36 PM
Data Sourced
via MITRE·08:36 PM
Description
Data Sourced
via NVD·09:15 PM
RemedyDescriptionSeverityAffected Software
Mar 31, 2021
Data Sourced
via Red Hat·05:41 PM
DescriptionSeverityAffected Software
Feb 24, 2026
Data Sourced
via Launchpad·09:13 PM
Description
Jul 8, 2026
Data Sourced
via Ubuntu·05:00 AM
RemedyDescriptionSeverityAffected Software
Jul 20, 2026
Data Sourced
via Debian·11:58 AM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2021-29646?

CVE-2021-29646 is classified as a high severity vulnerability due to the potential for a local user to crash the system.

2

How do I fix CVE-2021-29646?

To fix CVE-2021-29646, update the kernel to a version that is patched, such as 0:4.18.0-348.rt7.130.el8 for kernel-rt or 0:4.18.0-348.el8 for kernel.

3

Which systems are affected by CVE-2021-29646?

CVE-2021-29646 affects various Linux kernel versions prior to 5.11.11 and specific Fedora releases such as Fedora 32, 33, and 34.

4

Can CVE-2021-29646 be exploited remotely?

CVE-2021-29646 cannot be exploited remotely as it requires local access to the system.

5

What is the impact of exploiting CVE-2021-29646?

Exploiting CVE-2021-29646 can lead to a buffer overflow that crashes the affected system, resulting in denial of service.

Company

Resources

Contact

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