{ "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 7.\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: 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\n* kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation (CVE-2021-29154)\n\n* kernel: lack a full memory barrier upon the assignment of a new table value in net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h may lead to DoS (CVE-2021-29650)\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 to the latest RHEL7.9.z8 source tree (BZ#1982927)", "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-2021:3328", "url": "https://access.redhat.com/errata/RHSA-2021:3328" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "1945388", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1945388" }, { "category": "external", "summary": "1946684", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1946684" }, { "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_3328.json" } ], "title": "Red Hat Security Advisory: kernel-rt security and bug fix update", "tracking": { "current_release_date": "2026-06-28T12:34:52+00:00", "generator": { "date": "2026-06-28T12:34:52+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.2.6" } }, "id": "RHSA-2021:3328", "initial_release_date": "2021-08-31T09:18:32+00:00", "revision_history": [ { "date": "2021-08-31T09:18:32+00:00", "number": "1", "summary": "Initial version" }, { "date": "2021-08-31T09:18:32+00:00", "number": "2", "summary": "Last updated version" }, { "date": 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IPT_SO_SET_REPLACE (or IP6T_SO_SET_REPLACE) for 32 bit processes on 64 bit systems. 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": "In Red Hat Enterprise Linux 7, only privileged users can trigger this bug. In Red Hat Enterprise Linux 8 a regular user can trigger it, however 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's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.41.1.rt56.1181.el7.src", "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.41.1.rt56.1181.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-0:3.10.0-1160.41.1.rt56.1181.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-debuginfo-0:3.10.0-1160.41.1.rt56.1181.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-devel-0:3.10.0-1160.41.1.rt56.1181.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-kvm-0:3.10.0-1160.41.1.rt56.1181.el7.x86_64", 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Bounds of a Memory Buffer" }, "discovery_date": "2021-04-06T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "1946684" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernels eBPF implementation. By default, accessing the eBPF verifier is only accessible to privileged users with CAP_SYS_ADMIN. A local user with the ability to insert eBPF instructions can abuse a flaw in eBPF to corrupt memory. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation", "title": "Vulnerability summary" }, { "category": "other", "text": "This flaw is rated as having Moderate impact as eBPF requires a privileged user on Red Hat Enterprise Linux to correctly load eBPF instructions that can be exploited.", "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-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.41.1.rt56.1181.el7.src", "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.41.1.rt56.1181.el7.x86_64", 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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's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.41.1.rt56.1181.el7.src", "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.41.1.rt56.1181.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-0:3.10.0-1160.41.1.rt56.1181.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-debuginfo-0:3.10.0-1160.41.1.rt56.1181.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-devel-0:3.10.0-1160.41.1.rt56.1181.el7.x86_64", 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