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 5.10.226-1 6.1.115-1 6.1.112-1 6.11.5-1 6.11.7-1

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

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