rhsa-2021_3439
Vulnerability from csaf_redhat
Published
2021-09-07 15:02
Modified
2024-11-15 10:37
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update

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.


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        "text": "The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.\n\nSecurity Fix(es):\n\n* kernel: use-after-free in route4_change() in net/sched/cls_route.c (CVE-2021-3715)\n\nFor 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.\n\nBug Fix(es):\n\n* kernel-rt: update to the latest RHEL7.9.z source tree (BZ#1995878)",
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      "cve": "CVE-2021-3715",
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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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          "category": "summary",
          "text": "kernel: use-after-free in route4_change() in net/sched/cls_route.c",
          "title": "Vulnerability summary"
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        {
          "category": "other",
          "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.",
          "title": "Statement"
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        {
          "category": "general",
          "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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          "category": "external",
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      "title": "kernel: use-after-free in route4_change() in net/sched/cls_route.c"
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}


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