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    CVE-2015-0239

    The em_sysenter function in arch/x86/kvm/emulate.c in the Linux kernel before 3.18.5, when the guest OS lacks SYSENTER MSR initialization, allows guest OS users to gain guest OS privileges or cause a denial of service (guest OS crash) by triggering use of a 16-bit code segment for emulation of a SYSENTER instruction.

    Published:Jan 27, 2015
    Last Modified:Apr 12, 2025
    EPS:Mar 2, 2015
    EPSS Score:0.00101
    CVSS Score:4.4

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Linux
    Product
    Linux Kernel
    Vendor
    Oracle
    Product
    Linux
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Desktop
    Vendor
    Redhat
    Product
    Enterprise Linux Server
    Vendor
    Redhat
    Product
    Enterprise Linux Workstation

    Exploits

    http://www.openwall.com/lists/oss-security/2015/01/27/6http://www.openwall.com/lists/oss-security/2015/01/27/6

    Related CVEs

    CVE-2026-13476 (CVSS 7.3) — IBM Informix Dynamic Server 14.10, 15.0, and 12.10 could allow an unauthenticated user to execute arbitrary co…
    CVE-2026-13367 (CVSS 7.8) — IBM Informix Dynamic Server 14.10, and 15.0 contain a local privilege escalation vulnerability in the oninit s…
    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    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…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    References

    http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f3747379accba8e95d70cec0eae0582c8c182050
    http://permalink.gmane.org/gmane.linux.kernel.commits.head/502245
    http://rhn.redhat.com/errata/RHSA-2015-1272.html
    http://www.debian.org/security/2015/dsa-3170
    http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.5
    http://www.mandriva.com/security/advisories?name=MDVSA-2015:058
    http://www.openwall.com/lists/oss-security/2015/01/27/6
    http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
    http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
    http://www.securityfocus.com/bid/72842
    http://www.ubuntu.com/usn/USN-2513-1
    http://www.ubuntu.com/usn/USN-2514-1
    http://www.ubuntu.com/usn/USN-2515-1
    http://www.ubuntu.com/usn/USN-2516-1
    http://www.ubuntu.com/usn/USN-2517-1
    http://www.ubuntu.com/usn/USN-2518-1
    https://bugzilla.redhat.com/show_bug.cgi?id=1186448
    https://github.com/torvalds/linux/commit/f3747379accba8e95d70cec0eae0582c8c182050
    http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f3747379accba8e95d70cec0eae0582c8c182050
    http://permalink.gmane.org/gmane.linux.kernel.commits.head/502245
    http://rhn.redhat.com/errata/RHSA-2015-1272.html
    http://www.debian.org/security/2015/dsa-3170
    http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.5
    http://www.mandriva.com/security/advisories?name=MDVSA-2015:058
    http://www.openwall.com/lists/oss-security/2015/01/27/6
    http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
    http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
    http://www.securityfocus.com/bid/72842
    http://www.ubuntu.com/usn/USN-2513-1
    http://www.ubuntu.com/usn/USN-2514-1
    http://www.ubuntu.com/usn/USN-2515-1
    http://www.ubuntu.com/usn/USN-2516-1
    http://www.ubuntu.com/usn/USN-2517-1
    http://www.ubuntu.com/usn/USN-2518-1
    https://bugzilla.redhat.com/show_bug.cgi?id=1186448
    https://github.com/torvalds/linux/commit/f3747379accba8e95d70cec0eae0582c8c182050

    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