rhsa-2021_4000
Vulnerability from csaf_redhat
Published
2021-10-26 16:28
Modified
2024-11-22 17:16
Summary
Red Hat Security Advisory: kpatch-patch security update
Notes
Topic
An update is now available for Red Hat Enterprise Linux 7.7 Update Services for SAP Solutions.
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
This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel.
Security Fix(es):
* kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)
* kernel: powerpc: KVM guest OS users can cause host OS memory corruption (CVE-2021-37576)
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 © Red Hat, Inc. All rights reserved.", tlp: { label: "WHITE", url: "https://www.first.org/tlp/", }, }, lang: "en", notes: [ { category: "summary", text: "An update is now available for Red Hat Enterprise Linux 7.7 Update Services for SAP Solutions.\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: "This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel.\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: powerpc: KVM guest OS users can cause host OS memory corruption (CVE-2021-37576)\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-2021:4000", url: "https://access.redhat.com/errata/RHSA-2021:4000", }, { 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: "1986506", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1986506", }, { category: "self", summary: "Canonical URL", url: "https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_4000.json", }, ], title: "Red Hat Security Advisory: kpatch-patch security update", tracking: { current_release_date: "2024-11-22T17:16:02+00:00", generator: { date: "2024-11-22T17:16:02+00:00", engine: { name: "Red Hat SDEngine", version: "4.2.1", }, }, id: "RHSA-2021:4000", initial_release_date: "2021-10-26T16:28:07+00:00", revision_history: [ { date: "2021-10-26T16:28:07+00:00", number: "1", summary: "Initial version", }, { date: "2021-10-26T16:28:07+00:00", number: "2", summary: "Last updated version", }, { date: "2024-11-22T17:16:02+00:00", number: "3", summary: "Last generated version", }, ], status: "final", version: "3", }, }, product_tree: { branches: [ { branches: [ { branches: [ { category: "product_name", name: "Red Hat Enterprise Linux Server E4S (v. 7.7)", product: { name: "Red Hat 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"7Server-7.7.E4S:kpatch-patch-3_10_0-1062_56_1-debuginfo-0:1-1.el7.ppc64le", }, product_reference: "kpatch-patch-3_10_0-1062_56_1-debuginfo-0:1-1.el7.ppc64le", relates_to_product_reference: "7Server-7.7.E4S", }, { category: "default_component_of", full_product_name: { name: "kpatch-patch-3_10_0-1062_56_1-debuginfo-0:1-1.el7.x86_64 as a component of Red Hat Enterprise Linux Server E4S (v. 7.7)", product_id: "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_56_1-debuginfo-0:1-1.el7.x86_64", }, product_reference: "kpatch-patch-3_10_0-1062_56_1-debuginfo-0:1-1.el7.x86_64", relates_to_product_reference: "7Server-7.7.E4S", }, ], }, vulnerabilities: [ { cve: "CVE-2021-22543", cwe: { id: "CWE-863", name: "Incorrect Authorization", }, discovery_date: "2021-05-26T00:00:00+00:00", ids: [ { system_name: "Red Hat Bugzilla ID", text: "1965461", }, ], notes: [ { category: "description", text: "A flaw was found in the Linux kernel’s KVM implementation, where improper handing of the VM_IO|VM_PFNMAP VMAs in KVM bypasses RO checks and leads to pages being freed while still accessible by the VMM and guest. 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's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-0:1-6.el7.ppc64le", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-0:1-6.el7.src", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-0:1-6.el7.x86_64", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-debuginfo-0:1-6.el7.ppc64le", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-debuginfo-0:1-6.el7.x86_64", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_43_1-0:1-6.el7.ppc64le", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_43_1-0:1-6.el7.src", 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availabilityImpact: "HIGH", baseScore: 7, baseSeverity: "HIGH", confidentialityImpact: "HIGH", integrityImpact: "HIGH", privilegesRequired: "LOW", scope: "UNCHANGED", userInteraction: "NONE", vectorString: "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", version: "3.1", }, products: [ "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-0:1-6.el7.ppc64le", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-0:1-6.el7.src", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-0:1-6.el7.x86_64", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-debuginfo-0:1-6.el7.ppc64le", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-debuginfo-0:1-6.el7.x86_64", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_43_1-0:1-6.el7.ppc64le", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_43_1-0:1-6.el7.src", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_43_1-0:1-6.el7.x86_64", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_43_1-debuginfo-0:1-6.el7.ppc64le", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_43_1-debuginfo-0:1-6.el7.x86_64", 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On the PowerPC platform, the KVM guest allows the OS users to cause host OS memory corruption via rtas_args.nargs. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", title: "Vulnerability description", }, { category: "summary", text: "kernel: powerpc: KVM guest OS users can cause host OS memory corruption", title: "Vulnerability summary", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-0:1-6.el7.ppc64le", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-0:1-6.el7.src", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-0:1-6.el7.x86_64", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-debuginfo-0:1-6.el7.ppc64le", "7Server-7.7.E4S:kpatch-patch-3_10_0-1062_40_1-debuginfo-0:1-6.el7.x86_64", 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corruption", }, ], }
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- 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.