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 6.1.119-1 6.11.10-1 6.12.5-1 |
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.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-33034 https://nvd.nist.gov/vuln/detail/CVE-2021-33034 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c4c8c9544099bb9043a10a5318130a943e32fc3 https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-hci_send_acl https://syzkaller.appspot.com/bug?id=2e1943a94647f7732dd6fc60368642d6e8dc91b1
- https://bugzilla.redhat.com/show_bug.cgi?id=1961305
- https://access.redhat.com/errata/RHSA-2021:2726
- https://access.redhat.com/errata/RHSA-2021:2725
- https://access.redhat.com/errata/RHSA-2021:2727
- https://access.redhat.com/errata/RHSA-2021:2734
- https://access.redhat.com/errata/RHSA-2021:2733
- https://access.redhat.com/errata/RHSA-2021:2732
- https://access.redhat.com/errata/RHSA-2021:2730
- https://access.redhat.com/errata/RHSA-2021:2731
- https://access.redhat.com/errata/RHSA-2021:2728
- https://access.redhat.com/errata/RHSA-2021:2729
- https://access.redhat.com/errata/RHSA-2021:2599
- https://access.redhat.com/errata/RHSA-2021:2563
- https://access.redhat.com/errata/RHSA-2021:2570
- https://access.redhat.com/errata/RHSA-2021:2666
- https://access.redhat.com/errata/RHSA-2021:2668
- https://access.redhat.com/errata/RHSA-2021:2719
- https://access.redhat.com/errata/RHSA-2021:2718
- https://access.redhat.com/errata/RHSA-2021:2720
- https://access.redhat.com/errata/RHBA-2021:2854
- https://access.redhat.com/errata/RHSA-2021:2737
- https://access.redhat.com/errata/RHSA-2021:2736
- https://access.redhat.com/security/cve/cve-2021-33034
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c4c8c9544099bb9043a10a5318130a943e32fc3
- https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
- https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GI7Z7UBWBGD3ABNIL2DC7RQDCGA4UVQW/
- https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-hci_send_acl
- https://syzkaller.appspot.com/bug?id=2e1943a94647f7732dd6fc60368642d6e8dc91b1
- https://launchpad.net/bugs/cve/CVE-2021-33034
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GI7Z7UBWBGD3ABNIL2DC7RQDCGA4UVQW/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1961306
- https://exchange.xforce.ibmcloud.com/vulnerabilities/203149
- https://www.ibm.com/support/pages/node/6497499 (Advisory)
- https://git.kernel.org/linus/5c4c8c9544099bb9043a10a5318130a943e32fc3
- https://security-tracker.debian.org/tracker/CVE-2021-33034
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33034
- https://nvd.nist.gov/vuln/detail/CVE-2021-33034
- https://ubuntu.com/security/CVE-2021-33034
Parent vulnerabilities
(Appears in the following advisories)
- RHSA-2021:2726
- RHSA-2021:2725
- RHSA-2021:2727
- RHSA-2021:2734
- RHSA-2021:2733
- RHSA-2021:2732
- RHSA-2021:2730
- RHSA-2021:2731
- RHSA-2021:2728
- RHSA-2021:2729
- RHSA-2021:2599
- RHSA-2021:2563
- RHSA-2021:2570
- RHSA-2021:2666
- RHSA-2021:2668
- RHSA-2021:2719
- RHSA-2021:2718
- RHSA-2021:2720
- RHBA-2021:2854
- RHSA-2021:2737
- RHSA-2021:2736
- IBM-6497499
- collector/redhat-cve
- collector/nvd-index
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/author
- agent/severity
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-33034
- agent/software-canonical-lookup
- agent/weakness
- collector/mitre-cve
- source/MITRE
- collector/ibm-support
- source/IBM
- agent/references
- agent/remedy
- collector/usn-cve
- source/Ubuntu
- agent/tags
- agent/description
- agent/event
- collector/nvd-cve
- source/NVD
- agent/last-modified-date
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- agent/trending
- 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