Resource Exhaustion The advisory has been revoked - it doesn't affect any version of package kernel-cross-headers (opens in a new tab)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL8-KERNELCROSSHEADERS-4119539
- published11 Aug 2021
- disclosed20 Jul 2021
Introduced: 20 Jul 2021
CVE-2021-3679 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:8.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-cross-headers package and not the kernel-cross-headers package as distributed by RHEL.
A lack of CPU resource in the Linux kernel tracing module functionality in versions prior to 5.14-rc3 was found in the way user uses trace ring buffer in a specific way. Only privileged local users (with CAP_SYS_ADMIN capability) could use this flaw to starve the resources causing denial of service.
References
- https://access.redhat.com/security/cve/CVE-2021-3679
- https://www.debian.org/security/2021/dsa-4978
- https://bugzilla.redhat.com/show_bug.cgi?id=1989165
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=67f0d6d9883c13174669f88adac4f0ee656cc16a
- https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
- https://access.redhat.com/errata/RHSA-2021:4356
- https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
- https://github.com/aegistudio/RingBufferDetonator