rhsa-2021_3181
Vulnerability from csaf_redhat
Published
2021-08-17 08:33
Modified
2024-11-05 23:51
Summary
Red Hat Security Advisory: kpatch-patch security update
Notes
Topic
An update for kpatch-patch is now available for Red Hat Enterprise Linux 8.1 Extended 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
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: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)
* kernel: race condition for removal of the HCI controller (CVE-2021-32399)
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 kpatch-patch is now available for Red Hat Enterprise Linux 8.1 Extended 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": "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: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)\n\n* kernel: race condition for removal of the HCI controller (CVE-2021-32399)\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-2021:3181", "url": "https://access.redhat.com/errata/RHSA-2021:3181" }, { "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": "1970807", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1970807" }, { "category": "external", "summary": "1980101", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1980101" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3181.json" } ], "title": "Red Hat Security Advisory: kpatch-patch security update", "tracking": { "current_release_date": "2024-11-05T23:51:13+00:00", "generator": { "date": "2024-11-05T23:51:13+00:00", "engine": { "name": "Red Hat SDEngine", "version": "4.1.1" } }, "id": "RHSA-2021:3181", "initial_release_date": "2021-08-17T08:33:52+00:00", "revision_history": [ { "date": "2021-08-17T08:33:52+00:00", "number": "1", "summary": "Initial version" }, { "date": "2021-08-17T08:33:52+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2024-11-05T23:51:13+00:00", "number": "3", "summary": "Last generated version" } ], "status": "final", "version": "3" } }, "product_tree": 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"BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_51_2-debugsource-0:1-1.el8_1.ppc64le" }, "product_reference": "kpatch-patch-4_18_0-147_51_2-debugsource-0:1-1.el8_1.ppc64le", "relates_to_product_reference": "BaseOS-8.1.0.Z.EUS" }, { "category": "default_component_of", "full_product_name": { "name": "kpatch-patch-4_18_0-147_51_2-debugsource-0:1-1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 8.1)", "product_id": "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_51_2-debugsource-0:1-1.el8_1.x86_64" }, "product_reference": "kpatch-patch-4_18_0-147_51_2-debugsource-0:1-1.el8_1.x86_64", "relates_to_product_reference": "BaseOS-8.1.0.Z.EUS" } ] }, "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\u2019s 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\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_27_1-0:1-12.el8_1.ppc64le", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_27_1-0:1-12.el8_1.src", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_27_1-0:1-12.el8_1.x86_64", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_27_1-debuginfo-0:1-12.el8_1.ppc64le", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_27_1-debuginfo-0:1-12.el8_1.x86_64", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_27_1-debugsource-0:1-12.el8_1.ppc64le", 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This flaw will allow local user to gain privileges or cause a DoS through user name space. This action is usually restricted to root-privileged users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user is granted elevated privileges.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c", "title": "Vulnerability summary" }, { "category": "other", "text": "For the Red Hat Enterprise Linux 7 only privileged user can trigger this bug.\nFor the Red Hat Enterprise Linux 8 regular user can trigger it, and the result is corruption of 4 bytes of memory.", "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": [ 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"category": "external", "summary": "RHBZ#1980101", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1980101" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2021-22555", "url": "https://www.cve.org/CVERecord?id=CVE-2021-22555" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-22555", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22555" }, { "category": "external", "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d", "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d" }, { "category": "external", "summary": "https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528", "url": "https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528" } ], "release_date": 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If containers are in use, this requirement is not applicable.\nConfigure RHEL 8 to disable the use of user namespaces by adding the following line to a file in the \"/etc/sysctl.d/\" directory:\n\nuser.max_user_namespaces = 0\n\nThe system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command:\n\n$ sudo sysctl --system\n\n\nThe other mitigation for containers, if without disabling user namespaces, is blocking the pertinent syscalls in a seccomp policy file. 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"BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_51_2-debuginfo-0:1-1.el8_1.ppc64le", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_51_2-debuginfo-0:1-1.el8_1.x86_64", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_51_2-debugsource-0:1-1.el8_1.ppc64le", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_51_2-debugsource-0:1-1.el8_1.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ], "title": "kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c" }, { "cve": "CVE-2021-32399", "cwe": { "id": "CWE-362", "name": "Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)" }, "discovery_date": "2021-05-11T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "1970807" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel\u2019s handling of the removal of Bluetooth HCI controllers. This flaw allows an attacker with a local account to exploit a race condition, leading to corrupted memory and possible privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: race condition for removal of the HCI controller", "title": "Vulnerability summary" }, { "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": [ "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_27_1-0:1-12.el8_1.ppc64le", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_27_1-0:1-12.el8_1.src", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_27_1-0:1-12.el8_1.x86_64", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_27_1-debuginfo-0:1-12.el8_1.ppc64le", "BaseOS-8.1.0.Z.EUS:kpatch-patch-4_18_0-147_27_1-debuginfo-0:1-12.el8_1.x86_64", 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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.