Debian: DSA-4667-1: linux security update

    Date 28 Apr 2020
    240
    Posted By LinuxSecurity Advisories
    Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service, or information leak.
    
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    Debian Security Advisory DSA-4667-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    April 28, 2020                        https://www.debian.org/security/faq
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    Package        : linux
    CVE ID         : CVE-2020-2732 CVE-2020-8428 CVE-2020-10942 CVE-2020-11565
                     CVE-2020-11884
    
    Several vulnerabilities have been discovered in the Linux kernel that
    may lead to a privilege escalation, denial of service, or information
    leak.
    
    CVE-2020-2732
    
        Paulo Bonzini discovered that the KVM implementation for Intel
        processors did not properly handle instruction emulation for L2
        guests when nested virtualization is enabled.  This could allow
        an L2 guest to cause privilege escalation, denial of service,
        or information leaks in the L1 guest.
    
    CVE-2020-8428
    
        Al Viro discovered a use-after-free vulnerability in the VFS
        layer.  This allowed local users to cause a denial-of-service
        (crash) or obtain sensitive information from kernel memory.
    
    CVE-2020-10942
    
        It was discovered that the vhost_net driver did not properly
        validate the type of sockets set as back-ends.  A local user
        permitted to access /dev/vhost-net could use this to cause a stack
        corruption via crafted system calls, resulting in denial of
        service (crash) or possibly privilege escalation.
    
    CVE-2020-11565
    
        Entropy Moe reported that the shared memory filesystem (tmpfs) did
        not correctly handle an "mpol" mount option specifying an empty
        node list, leading to a stack-based out-of-bounds write.  If user
        namespaces are enabled, a local user could use this to cause a
        denial of service (crash) or possibly for privilege escalation.
    
    CVE-2020-11884
    
        Al Viro reported a race condition in memory management code for
        IBM Z (s390x architecture), that can result in the kernel
        executing code from the user address space.  A local user could
        use this for privilege escalation.
    
    For the stable distribution (buster), these problems have been fixed in
    version 4.19.98-1+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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