rhsa-2019_3843
Vulnerability from csaf_redhat
Published
2019-11-12 21:12
Modified
2024-11-05 21:36
Summary
Red Hat Security Advisory: kernel security update

Notes

Topic
An update for kernel is now available for Red Hat Enterprise Linux 6.5 Advanced 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 packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * hw: Machine Check Error on Page Size Change (IFU) (CVE-2018-12207) * hw: TSX Transaction Asynchronous Abort (TAA) (CVE-2019-11135) 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.
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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      "acknowledgments": [
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          "names": [
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          "summary": "Acknowledged by upstream."
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        "name": "Sensitive Information in Resource Not Removed Before Reuse"
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          "category": "description",
          "text": "A flaw was found in the way Intel CPUs handle inconsistency between, virtual to physical memory address translations in CPU\u0027s local cache and system software\u0027s Paging structure entries. A privileged guest user may use this flaw to induce a hardware Machine Check Error on the host processor, resulting in a severe DoS scenario by halting the processor.\r\n\r\nSystem software like OS OR Virtual Machine Monitor (VMM) use virtual memory system for storing program instructions and data in memory.  Virtual Memory system uses Paging structures like Page Tables and Page Directories to manage system memory. The processor\u0027s Memory Management Unit (MMU) uses Paging structure entries to translate program\u0027s  virtual memory addresses to physical memory addresses. The processor stores these address translations into its local cache buffer called - Translation Lookaside Buffer (TLB).  TLB has two parts, one for instructions and other for data addresses.\r\n\r\nSystem software can modify its Paging structure entries to change address mappings OR certain attributes like page size etc. Upon such Paging structure alterations in memory, system software must invalidate the corresponding address translations in the processor\u0027s TLB cache. But before this TLB invalidation takes place, a privileged guest user may trigger an instruction fetch operation, which could use an already cached, but now invalid, virtual to physical address translation from Instruction TLB (ITLB). Thus accessing an invalid physical memory address and resulting in halting the processor due to the Machine Check Error (MCE) on Page Size Change.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "hw: Machine Check Error on Page Size Change (IFU)",
          "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"
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          "summary": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00210.html",
          "url": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00210.html"
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      "title": "hw: Machine Check Error on Page Size Change (IFU)"
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          "names": [
            "Intel"
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      "cve": "CVE-2019-11135",
      "cwe": {
        "id": "CWE-203",
        "name": "Observable Discrepancy"
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      "ids": [
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          "text": "1753062"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way Intel CPUs handle speculative execution of instructions when the TSX Asynchronous Abort (TAA) error occurs. A local authenticated attacker with the ability to monitor execution times could infer the TSX memory state by comparing abort execution times. This could allow information disclosure via this observed side-channel for any TSX transaction being executed while an attacker is able to observe abort timing.\r\n\r\nIntel\u0027s Transactional Synchronisation Extensions (TSX) are set of instructions which enable transactional memory support to improve performance of the multi-threaded applications, in the lock-protected critical sections. The CPU executes instructions in the critical-sections as transactions, while ensuring their atomic state. When such transaction execution is unsuccessful, the processor cannot ensure atomic updates to the transaction memory, so the processor rolls back or aborts such transaction execution.\r\n\r\nWhile TSX Asynchronous Abort (TAA) is pending, CPU may continue to read data from architectural buffers and pass it to the dependent speculative operations. This may cause information leakage via speculative side-channel means, which is quite similar to the Microarchitectural Data Sampling (MDS) issue.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "hw: TSX Transaction Asynchronous Abort (TAA)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "libvirt and qemu-kvm on Red Hat Enterprise Linux 6 are not affected by this vulnerability as they do not support MSR-based CPU features.",
          "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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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "hw: TSX Transaction Asynchronous Abort (TAA)"
    }
  ]
}


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