Mageia 2020-0158: kernel-linus security update

    Date 03 Apr 2020
    733
    Posted By LinuxSecurity Advisories
    This update is based on upstream 5.5.15 and fixes atleast the following security vulnerabilities: In the Linux kernel 5.4.0-rc2, there is a use-after-free (read) in the __blk_add_trace function in kernel/trace/blktrace.c (which is used to
    MGASA-2020-0158 - Updated kernel-linus packages fix security vulnerabilities
    
    Publication date: 03 Apr 2020
    URL: https://advisories.mageia.org/MGASA-2020-0158.html
    Type: security
    Affected Mageia releases: 7
    CVE: CVE-2019-19768,
         CVE-2019-19769,
         CVE-2020-2732,
         CVE-2020-8647,
         CVE-2020-8648,
         CVE-2020-8649,
         CVE-2020-8835,
         CVE-2020-9383,
         CVE-2020-9391
    
    This update is based on upstream 5.5.15 and fixes atleast the following
    security vulnerabilities:
    
    In the Linux kernel 5.4.0-rc2, there is a use-after-free (read) in the
    __blk_add_trace function in kernel/trace/blktrace.c (which is used to
    fill out a blk_io_trace structure and place it in a per-cpu sub-buffer)
    (CVE-2019-19768).
    
    In the Linux kernel 5.3.10, there is a use-after-free (read) in the
    perf_trace_lock_acquire function (related to include/trace/events/lock.h)
    (CVE-2019-19769).
    
    A flaw was found in the way KVM hypervisor handled instruction emulation
    for the L2 guest when nested(=1) virtualization is enabled. In the
    instruction emulation, the L2 guest could trick the L0 hypervisor into
    accessing sensitive bits of the L1 hypervisor. An L2 guest could use this
    flaw to potentially access information of the L1 hypervisor
    (CVE-2020-2732).
    
    There is a use-after-free vulnerability in the Linux kernel through 5.5.2
    in the vc_do_resize function in drivers/tty/vt/vt.c (CVE-2020-8647).
    
    There is a use-after-free vulnerability in the Linux kernel through 5.5.2
    in the n_tty_receive_buf_common function in drivers/tty/n_tty.c
    (CVE-2020-8648).
    
    Manfred Paul discovered that the bpf verifier in the Linux kernel did not
    properly calculate register bounds for certain operations. A local attacker
    could use this to expose sensitive information (kernel memory) or gain
    administrative privileges (CVE-2020-8835).
    
    There is a use-after-free vulnerability in the Linux kernel through 5.5.2
    in the vgacon_invert_region function in drivers/video/console/vgacon.c. 
    (CVE-2020-8649).
    
    An issue was discovered in the Linux kernel through 5.5.6. set_fdc in
    drivers/block/floppy.c leads to a wait_til_ready out-of-bounds read
    because the FDC index is not checked for errors before assigning it,
    aka CID-2e90ca68b0d2 (CVE-2020-9383).
    
    An issue was discovered in the Linux kernel 5.4 and 5.5 through 5.5.6
    on the AArch64 architecture. It ignores the top byte in the address
    passed to the brk system call, potentially moving the memory break
    downwards when the application expects it to move upwards, aka CID-
    dcde237319e6. This has been observed to cause heap corruption with
    the GNU C Library malloc implementation (CVE-2020-9391).
    
    Security fixes and hardenings to the mac00211 layer to prevent leaking keys
    and frames.
    
    For other upstream fixes in this update, see the referenced changelogs.
    
    References:
    - https://bugs.mageia.org/show_bug.cgi?id=26426
    - https://kernelnewbies.org/Linux_5.5
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.1
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.2
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.3
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.4
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.5
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.6
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.7
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.8
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.9
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.10
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.11
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.12
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.13
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.14
    - https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.15
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-19768
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-19769
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-2732
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8647
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8648
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8649
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8835
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9383
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9391
    
    SRPMS:
    - 7/core/kernel-5.5.15-1.mga7
    

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