{ "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 for kernel-rt is now available for Red Hat Enterprise Linux 8.\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-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: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920)\n\n* kernel: local privilege escalation by exploiting the fsconfig syscall parameter leads to container breakout (CVE-2021-4154)\n\n* kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330)\n\n* kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS (CVE-2022-0435)\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 symbol '__rt_mutex_init' is exported GPL-only in kernel 4.18.0-348.2.1.rt7.132.el8_5 (BZ#2038423)\n\n* kernel-rt: update RT source tree to the RHEL-8.5.z3 source tree (BZ#2045589)", "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-2022:0819", "url": "https://access.redhat.com/errata/RHSA-2022:0819" }, { "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": "https://access.redhat.com/security/vulnerabilities/RHSB-2022-002" }, { "category": "external", "summary": "2031930", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2031930" }, { "category": "external", "summary": "2034514", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2034514" }, { "category": "external", "summary": "2042404", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2042404" }, { "category": "external", "summary": "2044809", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2044809" }, { "category": "external", "summary": "2048738", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2048738" }, { "category": "external", "summary": "2051505", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2051505" }, { "category": "external", "summary": "2060795", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2060795" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2022/rhsa-2022_0819.json" } ], "title": "Red Hat Security Advisory: kernel-rt security and bug fix update", "tracking": { "current_release_date": "2026-06-03T02:10:37+00:00", "generator": { "date": "2026-06-03T02:10:37+00:00", "engine": { "name": "Red Hat SDEngine", "version": "4.8.1" } }, "id": "RHSA-2022:0819", "initial_release_date": "2022-03-10T15:07:27+00:00", "revision_history": [ { "date": "2022-03-10T15:07:27+00:00", "number": "1", "summary": "Initial version" }, { "date": "2022-03-10T15:07:27+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-06-03T02:10:37+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 Real Time for NFV (v. 8)", "product": { "name": "Red Hat Enterprise Linux Real Time for NFV (v. 8)", "product_id": "NFV-8.5.0.Z.MAIN", "product_identification_helper": { "cpe": 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In this flaw, a missing cleanup may lead to a use-after-free due to a race problem. This flaw allows a local user to crash the system or escalate their privileges on the system.\r\n\r\nA read-after-free memory flaw was found in the Linux kernel's 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: Use After Free in unix_gc() which could result in a local privilege escalation", "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": [ "NFV-8.5.0.Z.MAIN:kernel-rt-0:4.18.0-348.20.1.rt7.150.el8_5.src", "NFV-8.5.0.Z.MAIN:kernel-rt-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-core-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-core-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", 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A local attacker with a user privilege could cause a privilege escalation by exploiting the fsconfig syscall parameter leading to a container breakout and a denial of service on the system.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: local privilege escalation by exploiting the fsconfig syscall parameter leads to container breakout", "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": [ "NFV-8.5.0.Z.MAIN:kernel-rt-0:4.18.0-348.20.1.rt7.150.el8_5.src", "NFV-8.5.0.Z.MAIN:kernel-rt-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-core-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-0:4.18.0-348.20.1.rt7.150.el8_5.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's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "NFV-8.5.0.Z.MAIN:kernel-rt-0:4.18.0-348.20.1.rt7.150.el8_5.src", "NFV-8.5.0.Z.MAIN:kernel-rt-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-core-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-core-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-debuginfo-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-devel-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", 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This flaw allows a remote user to crash the system or possibly escalate their privileges if they have access to the TIPC network.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS", "title": "Vulnerability summary" }, { "category": "other", "text": "Red Hat recommends to use TIPC Encryption to secure TIPC procotol's payload or use transport level to separate and/or secure (by both encrypting and authenticating via eg. IPSec/MACSec) the communication between nodes.", "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": [ "NFV-8.5.0.Z.MAIN:kernel-rt-0:4.18.0-348.20.1.rt7.150.el8_5.src", "NFV-8.5.0.Z.MAIN:kernel-rt-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-core-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-core-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-debuginfo-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-devel-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-kvm-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", 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kernel panic on systems using TIPC may lead to DoS" }, { "acknowledgments": [ { "names": [ "Yiqi Sun" ], "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’s 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's status, and are included for informational purposes to better 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allow privilege escalation" }, { "acknowledgments": [ { "names": [ "Max Kellermann" ], "organization": "CM4all" } ], "cve": "CVE-2022-0847", "cwe": { "id": "CWE-908", "name": "Use of Uninitialized Resource" }, "discovery_date": "2022-03-04T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "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's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "NFV-8.5.0.Z.MAIN:kernel-rt-0:4.18.0-348.20.1.rt7.150.el8_5.src", "NFV-8.5.0.Z.MAIN:kernel-rt-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-core-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-core-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", "NFV-8.5.0.Z.MAIN:kernel-rt-debug-debuginfo-0:4.18.0-348.20.1.rt7.150.el8_5.x86_64", 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