CVE-2021-33034: Use After Free

First published: Mon Mar 22 2021(Updated: )

A use-after-free flaw was found in hci_send_acl in the bluetooth host controller interface (HCI) in Linux kernel, where a local attacker with an access rights could cause a denial of service problem on the system The issue results from the object hchan, freed in hci_disconn_loglink_complete_evt, yet still used in other places. The highest threat from this vulnerability is to data integrity, confidentiality and system availability.

Credit: cve@mitre.org cve@mitre.org

Affected Software	Affected Version	How to fix
redhat/kernel-rt	<0:3.10.0-1160.36.2.rt56.1179.el7	0:3.10.0-1160.36.2.rt56.1179.el7
redhat/kernel	<0:3.10.0-1160.36.2.el7	0:3.10.0-1160.36.2.el7
redhat/kernel	<0:3.10.0-327.98.2.el7	0:3.10.0-327.98.2.el7
redhat/kernel	<0:3.10.0-514.90.2.el7	0:3.10.0-514.90.2.el7
redhat/kernel	<0:3.10.0-693.90.2.el7	0:3.10.0-693.90.2.el7
redhat/kernel	<0:3.10.0-957.78.2.el7	0:3.10.0-957.78.2.el7
redhat/kernel	<0:3.10.0-1062.52.2.el7	0:3.10.0-1062.52.2.el7
redhat/kernel-rt	<0:4.18.0-305.7.1.rt7.79.el8_4	0:4.18.0-305.7.1.rt7.79.el8_4
redhat/kernel	<0:4.18.0-305.7.1.el8_4	0:4.18.0-305.7.1.el8_4
redhat/kernel	<0:4.18.0-147.51.1.el8_1	0:4.18.0-147.51.1.el8_1
redhat/kernel-rt	<0:4.18.0-193.60.2.rt13.112.el8_2	0:4.18.0-193.60.2.rt13.112.el8_2
redhat/kernel	<0:4.18.0-193.60.2.el8_2	0:4.18.0-193.60.2.el8_2
redhat/redhat-virtualization-host	<0:4.3.17-20210713.0.el7_9	0:4.3.17-20210713.0.el7_9
redhat/redhat-virtualization-host	<0:4.4.7-20210715.1.el8_4	0:4.4.7-20210715.1.el8_4
Linux Linux kernel	<5.12.4
Fedoraproject Fedora	=34
Debian Debian Linux	=9.0
redhat/kernel	<5.13	5.13
IBM DRM	<=2.0.6
debian/linux		5.10.223-1 6.1.106-3 6.1.99-1 6.10.9-1

Remedy

Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.

Remedy

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c4c8c9544099bb9043a10a5318130a943e32fc3

Never miss a vulnerability like this again

Reference Links

Parent vulnerabilities

(Appears in the following advisories)

collector/redhat-cve
collector/nvd-index
agent/type
agent/first-publish-date
collector/launchpad-cve
source/Launchpad
agent/author
agent/severity
agent/remedy
agent/description
collector/nvd-cve
source/NVD
agent/software-canonical-lookup
collector/redhat-bugzilla
source/Red Hat
alias/CVE-2021-33034
agent/weakness
agent/references
collector/mitre-cve
source/MITRE
agent/last-modified-date
collector/ibm-support
source/IBM
agent/event
agent/tags
collector/security-tracker-debian
source/Debian
agent/softwarecombine
collector/usn-cve
source/Ubuntu
package-manager/redhat
vendor/linux
canonical/linux linux kernel
vendor/fedoraproject
canonical/fedoraproject fedora
version/fedoraproject fedora/34
vendor/debian
canonical/debian debian linux
version/debian debian linux/9.0
vendor/ibm
canonical/ibm drm
version/ibm drm/2.0.6
package-manager/debian

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.