rhsa-2020:2665
Vulnerability from csaf_redhat
Published
2020-06-23 12:24
Modified
2025-08-02 13:32
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 7. 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: vfio: access to disabled MMIO space of some devices may lead to DoS scenario (CVE-2020-12888) 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: hw: provide reporting and microcode mitigation toggle for CVE-2020-0543 / Special Register Buffer Data Sampling (SRBDS) (BZ#1827198) * kernel-rt: update to the latest RHEL7.8.z source tree (BZ#1844620)
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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        "name": "Uncaught Exception"
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          "text": "A flaw was found in the Linux kernel, where it allows userspace processes, for example, a guest VM, to directly access h/w devices via its VFIO driver modules. The VFIO modules allow users to enable or disable access to the devices\u0027 MMIO memory address spaces. If a user attempts to access the read/write devices\u0027 MMIO address space when it is disabled, some h/w devices issue an interrupt to the CPU to indicate a fatal error condition, crashing the system. This flaw allows a guest user or process to crash the host system resulting in a denial of service.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "Kernel: vfio: access to disabled MMIO space of some devices may lead to DoS scenario",
          "title": "Vulnerability summary"
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        {
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          "text": "This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.\nThis issue affects the versions of the kernel package as shipped with Red Hat Enterprise Linux 7 and 8. Future kernel updates for Red Hat Enterprise Linux 7 and 8 may address this issue.\n\nA regression of CVE-2020-12888 has been reintroduced in RHEL 9.4\u20139.6 due to the backport of the fork: defer linking file vma patch (related to CVE-2024-27022). This flaw allows a privileged VFIO userspace process to retain stale MMIO mappings after a fork(), leading to host crashes if the child process accesses the device after MMIO has been disabled. While the bug was transient in upstream (v6.9 only), it remains present in multiple RHEL9 releases. Only users with high privileges and access to a VFIO-assigned device can exploit this, and no impact is observed in standard QEMU or DPDK configurations. Regarding this regression, the status of RHEL-9 fixes (fixed for 9.7 and 9.6 for the 21 Jul 2025 and pending for 9.4):\nRHEL-9.7: RHEL-73613 (kernel-5.14.0-578.el9)\nRHEL-9.6.z: RHEL-85623 (kernel-5.14.0-570.26.1.el9_6)\nRHEL-9.5.z: N/A\nRHEL-9.4.z: RHEL-85621 (under development)\nThe 9.7 and 9.6.z fixes backport the upstream solution while the 9.4.z\nfix is pursuing a RHEL specific fix to reduce the scope and risk.\nRHEL-10 is not affected, because branched at 6.12.",
          "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"
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          "url": "https://access.redhat.com/security/cve/CVE-2020-12888"
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        {
          "category": "external",
          "summary": "RHBZ#1836244",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1836244"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-12888",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-12888"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-12888",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-12888"
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      "release_date": "2020-05-14T00:00:00+00:00",
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}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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