Race Condition Affecting bpftool package, versions <0:4.18.0-305.12.1.el8_4
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Test your applications- Snyk ID SNYK-CENTOS8-BPFTOOL-2116990
- published 26 Jul 2021
- disclosed 19 Jun 2021
Introduced: 19 Jun 2021
CVE-2021-3609 Open this link in a new tabHow to fix?
Upgrade Centos:8 bpftool to version 0:4.18.0-305.12.1.el8_4 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream bpftool package and not the bpftool package as distributed by Centos.
See How to fix? for Centos:8 relevant fixed versions and status.
.A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges. This race condition in net/can/bcm.c in the Linux kernel allows for local privilege escalation to root.
References
- https://access.redhat.com/security/cve/CVE-2021-3609
- https://access.redhat.com/errata/RHSA-2021:3057
- https://bugzilla.redhat.com/show_bug.cgi?id=1971651
- https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.md
- https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463
- https://security.netapp.com/advisory/ntap-20220419-0004/
- https://www.openwall.com/lists/oss-security/2021/06/19/1