Ubuntu 0039-1: Linux kernel vulnerability

    Date25 May 2018
    CategoryUbuntu
    5548
    Posted ByAnthony Pell
    Several security issues were fixed in the kernel.
    ==========================================================================
    Kernel Live Patch Security Notice LSN-0039-1
    May 25, 2018
    
    linux vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu:
    
    | Series           | Base kernel  | Arch     | flavors          |
    |------------------+--------------+----------+------------------|
    | Ubuntu 14.04 LTS | 4.4.0        | amd64    | generic          |
    | Ubuntu 14.04 LTS | 4.4.0        | amd64    | lowlatency       |
    | Ubuntu 16.04 LTS | 4.4.0        | amd64    | generic          |
    | Ubuntu 16.04 LTS | 4.4.0        | amd64    | lowlatency       |
    | Ubuntu 18.04 LTS | 4.15.0       | amd64    | generic          |
    | Ubuntu 18.04 LTS | 4.15.0       | amd64    | lowlatency       |
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    Alexei Starovoitov discovered that the Berkeley Packet Filter (BPF)
    implementation in the Linux kernel contained a branch-pruning logic issue
    around unreachable code. A local attacker could use this to cause a denial
    of service. (CVE-2017-17862)
    
    The ext4_iget function in fs/ext4/inode.c in the Linux kernel through 
    4.15.15 mishandles the case of a root directory with a zero i_links_count, 
    which allows attackers to cause a denial of service
    (ext4_process_freed_data NULL pointer dereference and OOPS) via a crafted
    ext4 image. (CVE-2018-1092)
    
    The ext4_valid_block_bitmap function in fs/ext4/balloc.c in the Linux 
    kernel through 4.15.15 allows attackers to cause a denial of service
    (out-of-bounds read and system crash) via a crafted ext4 image because
    balloc.c and ialloc.c do not validate bitmap block numbers. (CVE-2018-1093)
    
    A memory leak in the hwsim_new_radio_nl function in
    drivers/net/wireless/mac80211_hwsim.c in the Linux kernel through 4.15.9
    allows local users to cause a denial of service (memory consumption) by
    triggering an out-of-array error case. (CVE-2018-8087)
    
    Luo Quan and Wei Yang discovered that a race condition existed in the
    Advanced Linux Sound Architecture (ALSA) subsystem of the Linux kernel when
    handling ioctl()s. A local attacker could use this to cause a denial of
    service (system deadlock). (CVE-2018-1000004)
    
    Update instructions:
    
    The problem can be corrected by updating your livepatches to the following
    versions:
    
    | Kernel                    | Version  | flavors                  |
    |---------------------------+----------+--------------------------|
    | 4.4.0-124.148             | 39.1     | generic, lowlatency      |
    | lts-4.4.0-124.148~14.04.1 | 39.1     | generic, lowlatency      |
    | 4.15.0-20.21              | 39.3     | generic, lowlatency      |
    
    Additionally, you should install an updated kernel with these fixes and
    reboot at your convienience.
    
    References:
      CVE-2017-17862, CVE-2018-1092, CVE-2018-1093, CVE-2018-8087, CVE-2018-1000004
    
    -- 
    ubuntu-security-announce mailing list
    This email address is being protected from spambots. You need JavaScript enabled to view it.
    Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce
    
    You are not authorised to post comments.

    Comments powered by CComment

    LinuxSecurity Poll

    What do you think of the articles on LinuxSecurity?

    No answer selected. Please try again.
    Please select either existing option or enter your own, however not both.
    Please select minimum 0 answer(s) and maximum 3 answer(s).
    /main-polls/24-what-do-you-think-of-the-quality-of-the-articles-on-linuxsecurity?task=poll.vote&format=json
    24
    radio
    [{"id":"87","title":"Excellent, don't change a thing!","votes":"22","type":"x","order":"1","pct":55,"resources":[]},{"id":"88","title":"Should be more technical","votes":"5","type":"x","order":"2","pct":12.5,"resources":[]},{"id":"89","title":"Should include more HOWTOs","votes":"13","type":"x","order":"3","pct":32.5,"resources":[]}]["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"]["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"]350
    bottom200

    We use cookies to provide and improve our services. By using our site, you consent to our Cookie Policy.