rhsa-2022_0821
Vulnerability from csaf_redhat
Published
2022-03-10 15:15
Modified
2024-11-15 14:43
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 8.2 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
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: improper initialization of the "flags" member of the new pipe_buffer (CVE-2022-0847)
* kernel: fget: check that the fd still exists after getting a ref to it (CVE-2021-4083)
* kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330)
* kernel: cgroups v1 release_agent feature may allow privilege escalation (CVE-2022-0492)
* kernel: failing usercopy allows for use-after-free exploitation (CVE-2022-22942)
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 RT source tree to the latest RHEL-8.2.z16 Batch (BZ#2057698)
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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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-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: improper initialization of the \"flags\" member of the new pipe_buffer (CVE-2022-0847)\n\n* kernel: fget: check that the fd still exists after getting a ref to it (CVE-2021-4083)\n\n* kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330)\n\n* kernel: cgroups v1 release_agent feature may allow privilege escalation (CVE-2022-0492)\n\n* kernel: failing usercopy allows for use-after-free exploitation (CVE-2022-22942)\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 RT source tree to the latest RHEL-8.2.z16 Batch (BZ#2057698)", "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-2022:0821", "url": "https://access.redhat.com/errata/RHSA-2022:0821" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "https://access.redhat.com/security/vulnerabilities/RHSB-2022-002", "url": 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"cve": "CVE-2021-4083", "cwe": { "id": "CWE-362", "name": "Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)" }, "discovery_date": "2021-12-06T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2029923" } ], "notes": [ { "category": "description", "text": "A read-after-free memory flaw was found in the Linux kernel\u0027s garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: fget: check that the fd still exists after getting a ref to it", "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": [ "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.79.1.rt13.129.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", 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This flaw allows a local user to crash the system or escalate their privileges on the system.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: possible privileges escalation due to missing TLB flush", "title": "Vulnerability summary" }, { "category": "other", "text": "For the Red Hat Enterprise Linux default configuration, the issue occurs only if a local user is running malicious code on GPU. The GPU is used and the user is required to have privileges to access the i915 Intel GPU.", "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": [ "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.79.1.rt13.129.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-debuginfo-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-devel-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", 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"organization": "Nebula Lab" }, { "names": [ "Kevin Wang" ], "organization": "Huawei" } ], "cve": "CVE-2022-0492", "cwe": { "id": "CWE-862", "name": "Missing Authorization" }, "discovery_date": "2022-02-07T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2051505" } ], "notes": [ { "category": "description", "text": "A vulnerability was found in the Linux kernel\u2019s cgroup_release_agent_write in the kernel/cgroup/cgroup-v1.c function. This flaw, under certain circumstances, allows the use of the cgroups v1 release_agent feature to escalate privileges and bypass the namespace isolation unexpectedly.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: cgroups v1 release_agent feature may allow privilege escalation", "title": "Vulnerability summary" }, { "category": "other", "text": "In the OpenShift Container Platform (OCP) the container escape and privilege escalation caused by the CVE-2022-0492 vulnerability are blocked by the SELinux policy enabled (by default) on the OCP cluster nodes.\n\nRed Hat Virtualization requires SELinux running in enforcing mode[1] on all hypervisors and managers, which blocks this vulnerability.\n\n1. https://access.redhat.com/solutions/499473", "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 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"text": "2060795" } ], "notes": [ { "category": "description", "text": "A flaw was found in the way the \"flags\" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe and push_pipe functions in the Linux kernel and could thus contain stale values. An unprivileged local user could use this flaw to write to pages in the page cache backed by read only files and as such escalate their privileges on the system.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: improper initialization of the \"flags\" member of the new pipe_buffer", "title": "Vulnerability summary" }, { "category": "other", "text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available.\n\nNote that PIPE_BUF_FLAG_CAN_MERGE flag attack vector is not available in Red Hat Enterprise Linux 8 and thus the currently known exploits leveraging this flag do not work. The underlying issue (lack of proper pipe_buffer structure initialization) is still present though and other novel ways leading to successful exploitation cannot be fully ruled out.", "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": [ "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.79.1.rt13.129.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-debuginfo-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", 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This flaw allows a local attacker with user privileges to cause a privilege escalation problem.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: failing usercopy allows for use-after-free exploitation", "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": [ "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.79.1.rt13.129.el8_2.src", "NFV-8.2.0.Z.EUS:kernel-rt-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-core-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", "NFV-8.2.0.Z.EUS:kernel-rt-debug-core-0:4.18.0-193.79.1.rt13.129.el8_2.x86_64", 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for use-after-free exploitation" } ] }
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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.