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CVE-2018-8897 Opens Xen PV Systems Up To Exploit

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  • #1

    CVE-2018-8897 Opens Xen PV Systems Up To Exploit

    Phoronix: CVE-2018-8897 Opens Xen PV Systems Up To Exploit

    Besides kernels being addressed for the newly-disclosed CVE-2018-8897 vulnerability, users of Xen para-virtualization should also run a patched Xen system right away...

    CVE-2018-8897 Opens Xen PV Systems Up To Exploit - Phoronix
    http://www.phoronix.com/scan.php?page=news_item&px=CVE-2018-8897-Xen-PV
    Phoronix, Linux Hardware Reviews, Linux hardware benchmarks, Linux server benchmarks, Linux benchmarking, Desktop Linux, Linux performance, Open Source graphics, Linux How To, Ubuntu benchmarks, Ubuntu hardware, Phoronix Test Suite
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  • #2
    CVE-2018-8897 : A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SD
    https://www.cvedetails.com/cve/CVE-2018-8897/
    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.


    > A statement in the [Intel] Software Developer's Manual (SDM) was mishandled in the development of some or all operating-system kernels

    LOL!
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