Vulnerability-Lookup

RHSA-2021:3439

Vulnerability from csaf_redhat - Published: 2021-09-07 15:02 - Updated: 2026-08-25 14:38

Summary

Red Hat Security Advisory: kernel-rt security and bug fix update

Severity

Moderate

Notes

Topic: An update for kernel-rt is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: use-after-free in route4_change() in net/sched/cls_route.c (CVE-2021-3715) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es): * kernel-rt: update to the latest RHEL7.9.z source tree (BZ#1995878)

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2021-3715

A flaw was found in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

7.8 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-416 - Use After Free

Affected products

Fixed 30 products

Product	Version	Remediation
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.42.2.rt56.1182.el7.src	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-debug-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-debug-debuginfo-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-debug-devel-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-debug-kvm-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-debug-kvm-debuginfo-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-debuginfo-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-debuginfo-common-x86_64-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-devel-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-doc-0:3.10.0-1160.42.2.rt56.1182.el7.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-kvm-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-kvm-debuginfo-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-trace-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-trace-debuginfo-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-trace-devel-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-trace-kvm-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-NFV-7.9.Z:kernel-rt-trace-kvm-debuginfo-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-0:3.10.0-1160.42.2.rt56.1182.el7.src	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-debug-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-debug-debuginfo-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-debug-devel-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-debuginfo-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-debuginfo-common-x86_64-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-devel-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-doc-0:3.10.0-1160.42.2.rt56.1182.el7.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-trace-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-trace-debuginfo-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-RT-7.9.Z:kernel-rt-trace-devel-0:3.10.0-1160.42.2.rt56.1182.el7.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2021:3439	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=1993988	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2021-3715	self
https://bugzilla.redhat.com/show_bug.cgi?id=1993988	external
https://www.cve.org/CVERecord?id=CVE-2021-3715	external
https://nvd.nist.gov/vuln/detail/CVE-2021-3715	external
https://git.kernel.org/pub/scm/linux/kernel/git/t…	external

Acknowledgments

Zhenpeng Lin

JSON

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          "text": "A flaw was found in the \"Routing decision\" classifier in the Linux kernel\u0027s Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.",
          "title": "Vulnerability description"
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          "text": "kernel: use-after-free in route4_change() in net/sched/cls_route.c",
          "title": "Vulnerability summary"
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          "text": "This flaw is rated as having Moderate impact (Red Hat Enterprise Linux 7 and lower) because of the need to have CAP_NET_ADMIN privileges and that Red Hat Enterprise Linux 7 disabled unprivileged user/network namespaces by default.\n\nThis flaw is rated as having Important impact (Red Hat Enterprise Linux 8) because Red Hat Enterprise Linux 8 enabled unprivileged user/network namespaces by default which can be used to gain CAP_NET_ADMIN privileges in corresponding user namespace even for otherwise unprivileged local user and thus exercise this vulnerability.",
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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CVE-2021-3715 (GCVE-0-2021-3715)

Vulnerability from cvelistv5 – Published: 2022-03-02 22:17 – Updated: 2024-08-03 17:01

Summary

Severity

No CVSS data available.

CWE

CWE-416

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1062 records in the last 180 days details

References

1 reference

URL	Tags
https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	kernel	Affected: Linux kernel 5.10

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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