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    CVE-2016-3157

    The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel does not properly context-switch IOPL on 64-bit PV Xen guests, which allows local guest OS users to gain privileges, cause a denial of service (guest OS crash), or obtain sensitive information by leveraging I/O port access.

    Published:Mar 16, 2016
    Last Modified:Apr 12, 2025
    EPS:Apr 12, 2016
    EPSS Score:0.00146
    CVSS Score:7.8

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Xen
    Product
    Xen

    Exploits

    No exploit reference

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    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
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    References

    http://www.debian.org/security/2016/dsa-3607
    http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
    http://www.securityfocus.com/bid/84594
    http://www.securitytracker.com/id/1035308
    http://www.ubuntu.com/usn/USN-2968-1
    http://www.ubuntu.com/usn/USN-2968-2
    http://www.ubuntu.com/usn/USN-2969-1
    http://www.ubuntu.com/usn/USN-2970-1
    http://www.ubuntu.com/usn/USN-2971-1
    http://www.ubuntu.com/usn/USN-2971-2
    http://www.ubuntu.com/usn/USN-2971-3
    http://www.ubuntu.com/usn/USN-2996-1
    http://www.ubuntu.com/usn/USN-2997-1
    http://xenbits.xen.org/xsa/advisory-171.html
    http://www.debian.org/security/2016/dsa-3607
    http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
    http://www.securityfocus.com/bid/84594
    http://www.securitytracker.com/id/1035308
    http://www.ubuntu.com/usn/USN-2968-1
    http://www.ubuntu.com/usn/USN-2968-2
    http://www.ubuntu.com/usn/USN-2969-1
    http://www.ubuntu.com/usn/USN-2970-1
    http://www.ubuntu.com/usn/USN-2971-1
    http://www.ubuntu.com/usn/USN-2971-2
    http://www.ubuntu.com/usn/USN-2971-3
    http://www.ubuntu.com/usn/USN-2996-1
    http://www.ubuntu.com/usn/USN-2997-1
    http://xenbits.xen.org/xsa/advisory-171.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High