Linux Security
    Linux Security
    Linux Security

    Debian: DSA-4531-1: linux security update

    Date
    2402
    Posted By
    Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-4531-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    September 25, 2019                    https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : linux
    CVE ID         : CVE-2019-14821 CVE-2019-14835 CVE-2019-15117 CVE-2019-15118
                     CVE-2019-15902
    
    Several vulnerabilities have been discovered in the Linux kernel that
    may lead to a privilege escalation, denial of service or information
    leaks.
    
    CVE-2019-14821
    
        Matt Delco reported a race condition in KVM's coalesced MMIO
        facility, which could lead to out-of-bounds access in the kernel.
        A local attacker permitted to access /dev/kvm could use this to
        cause a denial of service (memory corruption or crash) or possibly
        for privilege escalation.
    
    CVE-2019-14835
    
        Peter Pi of Tencent Blade Team discovered a missing bounds check
        in vhost_net, the network back-end driver for KVM hosts, leading
        to a buffer overflow when the host begins live migration of a VM.
        An attacker in control of a VM could use this to cause a denial of
        service (memory corruption or crash) or possibly for privilege
        escalation on the host.
    
    CVE-2019-15117
    
        Hui Peng and Mathias Payer reported a missing bounds check in the
        usb-audio driver's descriptor parsing code, leading to a buffer
        over-read.  An attacker able to add USB devices could possibly use
        this to cause a denial of service (crash).
    
    CVE-2019-15118
    
        Hui Peng and Mathias Payer reported unbounded recursion in the
        usb-audio driver's descriptor parsing code, leading to a stack
        overflow.  An attacker able to add USB devices could use this to
        cause a denial of service (memory corruption or crash) or possibly
        for privilege escalation.  On the amd64 architecture, and on the
        arm64 architecture in buster, this is mitigated by a guard page
        on the kernel stack, so that it is only possible to cause a crash.
    
    CVE-2019-15902
    
        Brad Spengler reported that a backporting error reintroduced a
        spectre-v1 vulnerability in the ptrace subsystem in the
        ptrace_get_debugreg() function.
    
    For the oldstable distribution (stretch), these problems have been fixed
    in version 4.9.189-3+deb9u1.
    
    For the stable distribution (buster), these problems have been fixed in
    version 4.19.67-2+deb10u1.
    
    We recommend that you upgrade your linux packages.
    
    For the detailed security status of linux please refer to its security
    tracker page at:
    https://security-tracker.debian.org/tracker/linux
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    

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