{ "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: Heap overflow in mwifiex_update_bss_desc_with_ie function in marvell/mwifiex/scan.c (CVE-2019-3846)\n\n* Kernel: KVM: nVMX: guest accesses L0 MSR causes potential DoS (CVE-2019-3887)\n\n* kernel: brcmfmac heap buffer overflow in brcmf_wowl_nd_results (CVE-2019-9500)\n\n* kernel: Count overflow in FUSE request leading to use-after-free issues. (CVE-2019-11487)\n\n* kernel: brcmfmac frame validation bypass (CVE-2019-9503)\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* BUG: scheduling while atomic in zswap (BZ#1726362)\n\n* kernel-rt: update to the RHEL8.0.z batch#3 source tree (BZ#1734475)", "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-2019:2741", "url": "https://access.redhat.com/errata/RHSA-2019:2741" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "1695044", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1695044" }, { "category": "external", "summary": "1701224", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1701224" }, { "category": "external", "summary": "1701842", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1701842" }, { "category": "external", "summary": "1703063", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1703063" }, { "category": "external", "summary": "1713059", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1713059" }, { "category": "external", "summary": "1726362", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1726362" }, { "category": "external", "summary": "1734475", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1734475" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2019/rhsa-2019_2741.json" } ], "title": "Red Hat Security Advisory: kernel-rt security and bug fix update", "tracking": { "current_release_date": "2026-06-28T12:32:18+00:00", "generator": { "date": "2026-06-28T12:32:18+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.2.6" } }, "id": "RHSA-2019:2741", "initial_release_date": "2019-09-12T13:08:59+00:00", "revision_history": [ { "date": "2019-09-12T13:08:59+00:00", "number": "1", "summary": "Initial version" }, { "date": "2019-09-12T13:08:59+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-06-28T12:32:18+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-8.0.0.Z", "product_identification_helper": { "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv" } } }, { "category": "product_name", "name": "Red Hat Enterprise Linux Real Time (v. 8)", "product": { "name": "Red Hat Enterprise Linux Real Time (v. 8)", "product_id": "RT-8.0.0.Z", 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"category": "description", "text": "A flaw was found In the Linux kernel, through version 4.19.6, where a local user could exploit a use-after-free in the ALSA driver by supplying a malicious USB Sound device (with zero interfaces) that is mishandled in usb_audio_probe in sound/usb/card.c. An attacker could corrupt memory and possibly escalate privileges if the attacker is able to have physical access to the system.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: Use-after-free in sound/usb/card.c:usb_audio_probe()", "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-8.0.0.Z:kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0.src", "NFV-8.0.0.Z:kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-core-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-debug-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-debug-core-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", 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A heap overflow in mwifiex_update_bss_desc_with_ie function in marvell/mwifiex/scan.c allows remote attackers to cause a denial of service(system crash) or execute arbitrary code.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: Heap overflow in mwifiex_update_bss_desc_with_ie function in marvell/mwifiex/scan.c", "title": "Vulnerability summary" }, { "category": "other", "text": "This flaw is currently rated as Important as it is possible for an attacker to setup a wifi access point with identical configuration in another location and intercept have the system auto connect and possibly 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": [ 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"organization": "Google.com" } ], "cve": "CVE-2019-3887", "cwe": { "id": "CWE-863", "name": "Incorrect Authorization" }, "discovery_date": "2019-04-01T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "1695044" } ], "notes": [ { "category": "description", "text": "A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Register (MSR) access with nested(=1) virtualization enabled. In that, L1 guest could access L0's APIC register values via L2 guest, when 'virtualize x2APIC mode' is enabled. A guest could use this flaw to potentially crash the host kernel resulting in DoS issue.", "title": "Vulnerability description" }, { "category": "summary", "text": "Kernel: KVM: nVMX: guest accesses L0 MSR causes potential DoS", "title": "Vulnerability summary" }, { "category": "other", "text": "This issue does not affect the version of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.", "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-8.0.0.Z:kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0.src", "NFV-8.0.0.Z:kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-core-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", 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This vulnerability can be exploited by compromised chipsets to compromise the host, or when used in combination with another brcmfmac driver flaw (CVE-2019-9503), can be used remotely. This can result in a remote denial of service (DoS). Due to the nature of the flaw, a remote privilege escalation cannot be fully ruled out.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: brcmfmac heap buffer overflow in brcmf_wowl_nd_results", "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-8.0.0.Z:kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0.src", "NFV-8.0.0.Z:kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-core-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-debug-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-debug-core-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-debug-debuginfo-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", 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remote source, the is_wlc_event_frame function will cause this frame to be discarded and not be processed. If the driver receives the firmware event frame from the host, the appropriate handler is called. This frame validation can be bypassed if the bus used is USB (for instance by a WiFi dongle). This can allow firmware event frames from a remote source to be processed and this can result in denial of service (DoS) condition.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: brcmfmac frame validation bypass", "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-8.0.0.Z:kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0.src", "NFV-8.0.0.Z:kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-core-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-debug-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-debug-core-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", 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"1703063" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel's implementation of the FUSE filesystem, where it allows a page reference counter overflow. If a page reference counter overflows into a negative value, it can be placed back into the \"free\" list for reuse by other applications. This flaw allows a local attacker who can manipulate memory page reference counters to cause memory corruption and possible privilege escalation by triggering a use-after-free condition.\r\n\r\nThe current attack requires the system to have approximately 140 GB of RAM for this attack to be performed. It may be possible that the attack can occur with fewer memory requirements.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: Count overflow in FUSE request leading to use-after-free issues.", "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-8.0.0.Z:kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0.src", "NFV-8.0.0.Z:kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-core-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-debug-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-debug-core-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", "NFV-8.0.0.Z:kernel-rt-debug-debuginfo-0:4.18.0-80.11.1.rt9.156.el8_0.x86_64", 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See “How do I blacklist a kernel module to prevent it from loading automatically?\" ( https://access.redhat.com/solutions/41278) for instructions on how to disable the 'fuse' kernel module from autoloading. 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