rhsa-2021_3767
Vulnerability from csaf_redhat
Published
2021-10-12 09:01
Modified
2024-11-05 23:57
Summary
Red Hat Security Advisory: kernel security update
Notes
Topic
An update for kernel is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. 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 packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)
* kernel: SVM nested virtualization issue in KVM (AVIC support) (CVE-2021-3653)
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.
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.
{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "summary", "text": "An update for kernel is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support.\n\nRed Hat Product Security has rated this update as having a security impact of Important. 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.", "title": "Topic" }, { "category": "general", "text": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)\n\n* kernel: SVM nested virtualization issue in KVM (AVIC support) (CVE-2021-3653)\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.", "title": "Details" }, { "category": "legal_disclaimer", "text": "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.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "https://access.redhat.com/errata/RHSA-2021:3767", "url": "https://access.redhat.com/errata/RHSA-2021:3767" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "1965461", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1965461" }, { "category": "external", "summary": "1983686", 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"relates_to_product_reference": "7Server-optional-7.2.AUS" } ] }, "vulnerabilities": [ { "acknowledgments": [ { "names": [ "Maxim Levitsky" ], "organization": "Red Hat", "summary": "This issue was discovered by Red Hat." } ], "cve": "CVE-2021-3653", "cwe": { "id": "CWE-862", "name": "Missing Authorization" }, "discovery_date": "2021-07-15T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "1983686" } ], "notes": [ { "category": "description", "text": "A flaw was found in the KVM\u0027s AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the \"int_ctl\" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: SVM nested virtualization issue in KVM (AVIC support)", "title": "Vulnerability summary" }, { "category": "other", "text": "The nested virtualization feature is not enabled by default up to Red Hat Enterprise Linux 8.4. Most importantly, Red Hat currently provides nested virtualization only as a Technology Preview, and is therefore unsupported for production use. For additional details please see https://access.redhat.com/solutions/21101 and https://access.redhat.com/support/offerings/techpreview.", "title": "Statement" }, { "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.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "7Server-7.2.AUS:kernel-0:3.10.0-327.101.1.el7.src", "7Server-7.2.AUS:kernel-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-abi-whitelists-0:3.10.0-327.101.1.el7.noarch", "7Server-7.2.AUS:kernel-debug-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-debug-debuginfo-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-debug-devel-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-debuginfo-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-debuginfo-common-x86_64-0:3.10.0-327.101.1.el7.x86_64", 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This flaw allows users who can start and control a VM to read/write random pages of memory, resulting in local privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, and system availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks", "title": "Vulnerability summary" }, { "category": "other", "text": "Both Red Hat Enterprise Linux 7 and Red Hat Enterprise Linux 8 leverage udev to set the proper permissions (ugo=rw) of the `/dev/kvm` device, making it accessible to all users. It is worth noting that while the KVM rule is part of the main udev package in Red Hat Enterprise Linux 8, the same rule is shipped with the `qemu-kvm` package in Red Hat Enterprise Linux 7. In other words, Red Hat Enterprise Linux 7 does not expose `/dev/kvm` to unprivileged users by default, as long as the `qemu-kvm` package is not installed.", "title": "Statement" }, { "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.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "7Server-7.2.AUS:kernel-0:3.10.0-327.101.1.el7.src", "7Server-7.2.AUS:kernel-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-abi-whitelists-0:3.10.0-327.101.1.el7.noarch", "7Server-7.2.AUS:kernel-debug-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-debug-debuginfo-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-debug-devel-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-debuginfo-0:3.10.0-327.101.1.el7.x86_64", 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"https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584" } ], "release_date": "2021-05-18T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2021-10-12T09:01:11+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.", "product_ids": [ "7Server-7.2.AUS:kernel-0:3.10.0-327.101.1.el7.src", "7Server-7.2.AUS:kernel-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-abi-whitelists-0:3.10.0-327.101.1.el7.noarch", "7Server-7.2.AUS:kernel-debug-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-debug-debuginfo-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-debug-devel-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-debuginfo-0:3.10.0-327.101.1.el7.x86_64", "7Server-7.2.AUS:kernel-debuginfo-common-x86_64-0:3.10.0-327.101.1.el7.x86_64", 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"7Server-optional-7.2.AUS:python-perf-debuginfo-0:3.10.0-327.101.1.el7.x86_64" ], "restart_required": { "category": "machine" }, "url": "https://access.redhat.com/errata/RHSA-2021:3767" }, { "category": "workaround", "details": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. 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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.