suse-su-2018:1640-1
Vulnerability from csaf_suse
Published
2018-06-11 08:38
Modified
2018-06-11 08:38
Summary
Security update for the Linux Kernel (Live Patch 7 for SLE 12 SP3)

Notes

Title of the patch
Security update for the Linux Kernel (Live Patch 7 for SLE 12 SP3)
Description of the patch
This update for the Linux Kernel 4.4.103-6_38 fixes several issues. The following security issues were fixed: - CVE-2017-13166: An elevation of privilege vulnerability in the kernel v4l2 video driver was fixed. (bsc#1085447). - CVE-2018-8897: A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL < 3, the debug exception is delivered after the transfer to CPL < 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs (bsc#1090368). - CVE-2018-8781: The udl_fb_mmap function in drivers/gpu/drm/udl/udl_fb.c had an integer-overflow vulnerability allowing local users with access to the udldrmfb driver to obtain full read and write permissions on kernel physical pages, resulting in a code execution in kernel space (bsc#1090646). - bsc#1083125: Fixed kgraft: small race in reversion code - CVE-2018-1087: kernel KVM was vulnerable to a flaw in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest (bsc#1090869) before
Patchnames
SUSE-SLE-Live-Patching-12-SP3-2018-1106
Terms of use
CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).


To clipboard 

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          "text": "kernel KVM before versions kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2 and kernel 4.17-rc3 is vulnerable to a flaw in the way the Linux kernel\u0027s KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.",
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          "text": "The udl_fb_mmap function in drivers/gpu/drm/udl/udl_fb.c at the Linux kernel version 3.4 and up to and including 4.15 has an integer-overflow vulnerability allowing local users with access to the udldrmfb driver to obtain full read and write permissions on kernel physical pages, resulting in a code execution in kernel space.",
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          "text": "https://www.suse.com/security/cve/CVE-2018-8897"
        }
      ],
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        {
          "category": "general",
          "text": "A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer\u0027s Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL \u003c 3, the debug exception is delivered after the transfer to CPL \u003c 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs.",
          "title": "CVE description"
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          "url": "https://bugzilla.suse.com/1087078"
        },
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          "summary": "SUSE Bug 1087088 for CVE-2018-8897",
          "url": "https://bugzilla.suse.com/1087088"
        },
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          "summary": "SUSE Bug 1090368 for CVE-2018-8897",
          "url": "https://bugzilla.suse.com/1090368"
        },
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          "summary": "SUSE Bug 1090820 for CVE-2018-8897",
          "url": "https://bugzilla.suse.com/1090820"
        },
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          "summary": "SUSE Bug 1090869 for CVE-2018-8897",
          "url": "https://bugzilla.suse.com/1090869"
        },
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          "summary": "SUSE Bug 1092497 for CVE-2018-8897",
          "url": "https://bugzilla.suse.com/1092497"
        },
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          "category": "external",
          "summary": "SUSE Bug 1093522 for CVE-2018-8897",
          "url": "https://bugzilla.suse.com/1093522"
        },
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          "summary": "SUSE Bug 1093524 for CVE-2018-8897",
          "url": "https://bugzilla.suse.com/1093524"
        },
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          "category": "external",
          "summary": "SUSE Bug 1098813 for CVE-2018-8897",
          "url": "https://bugzilla.suse.com/1098813"
        },
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          "category": "external",
          "summary": "SUSE Bug 1100835 for CVE-2018-8897",
          "url": "https://bugzilla.suse.com/1100835"
        },
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          "summary": "SUSE Bug 1115893 for CVE-2018-8897",
          "url": "https://bugzilla.suse.com/1115893"
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        {
          "category": "external",
          "summary": "SUSE Bug 1178658 for CVE-2018-8897",
          "url": "https://bugzilla.suse.com/1178658"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Enterprise Live Patching 12 SP3:kgraft-patch-4_4_103-6_38-default-6-2.1.ppc64le",
            "SUSE Linux Enterprise Live Patching 12 SP3:kgraft-patch-4_4_103-6_38-default-6-2.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "products": [
            "SUSE Linux Enterprise Live Patching 12 SP3:kgraft-patch-4_4_103-6_38-default-6-2.1.ppc64le",
            "SUSE Linux Enterprise Live Patching 12 SP3:kgraft-patch-4_4_103-6_38-default-6-2.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2018-06-11T08:38:23Z",
          "details": "important"
        }
      ],
      "title": "CVE-2018-8897"
    }
  ]
}


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