Use After Free Affecting kernel-debug package, versions <0:4.18.0-305.7.1.el8_4
Threat Intelligence
EPSS
0.07% (34th
percentile)
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUG-4056632
- published 26 Jul 2021
- disclosed 22 Mar 2021
Introduced: 22 Mar 2021
CVE-2021-33034 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-debug to version 0:4.18.0-305.7.1.el8_4 or higher.
This issue was patched in RHSA-2021:2570.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug package and not the kernel-debug package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an hci_chan, aka CID-5c4c8c954409. This leads to writing an arbitrary value.
References
- https://access.redhat.com/security/cve/CVE-2021-33034
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GI7Z7UBWBGD3ABNIL2DC7RQDCGA4UVQW/
- 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://sites.google.com/view/syzscope/kasan-use-after-free-read-in-hci_send_acl
- https://syzkaller.appspot.com/bug?id=2e1943a94647f7732dd6fc60368642d6e8dc91b1
- https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
- https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
- https://access.redhat.com/errata/RHSA-2021:2570
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GI7Z7UBWBGD3ABNIL2DC7RQDCGA4UVQW/
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