RedHat: RHSA-2019-1480:01 Important: kernel-rt security and bug fix update

    Date17 Jun 2019
    CategoryRed Hat
    855
    Posted ByLinuxSecurity Advisories
    An update for kernel-rt is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability
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    =====================================================================
                       Red Hat Security Advisory
    
    Synopsis:          Important: kernel-rt security and bug fix update
    Advisory ID:       RHSA-2019:1480-01
    Product:           Red Hat Enterprise Linux
    Advisory URL:      https://access.redhat.com/errata/RHSA-2019:1480
    Issue date:        2019-06-17
    CVE Names:         CVE-2019-9213 CVE-2019-11477 CVE-2019-11478 
                       CVE-2019-11479 
    =====================================================================
    
    1. Summary:
    
    An update for kernel-rt is now available for Red Hat Enterprise Linux 8.
    
    Red Hat Product Security has rated this update as having a security impact
    of Important. A Common Vulnerability Scoring System (CVSS) base score,
    which gives a detailed severity rating, is available for each vulnerability
    from the CVE link(s) in the References section.
    
    2. Relevant releases/architectures:
    
    Red Hat Enterprise Linux Real Time (v. 8) - x86_64
    Red Hat Enterprise Linux Real Time for NFV (v. 8) - x86_64
    
    3. Description:
    
    The kernel-rt packages provide the Real Time Linux Kernel, which enables
    fine-tuning for systems with extremely high determinism requirements.
    
    Security Fix(es):
    
    * An integer overflow flaw was found in the way the Linux kernel's
    networking subsystem processed TCP Selective Acknowledgment (SACK)
    segments. While processing SACK segments, the Linux kernel's socket buffer
    (SKB) data structure becomes fragmented. Each fragment is about TCP maximum
    segment size (MSS) bytes. To efficiently process SACK blocks, the Linux
    kernel merges multiple fragmented SKBs into one, potentially overflowing
    the variable holding the number of segments. A remote attacker could use
    this flaw to crash the Linux kernel by sending a crafted sequence of SACK
    segments on a TCP connection with small value of TCP MSS, resulting in a
    denial of service (DoS). (CVE-2019-11477)
    
    * kernel: lack of check for mmap minimum address in expand_downwards in
    mm/mmap.c leads to NULL pointer dereferences exploit on non-SMAP platforms
    (CVE-2019-9213)
    
    * Kernel: tcp: excessive resource consumption while processing SACK blocks
    allows remote denial of service (CVE-2019-11478)
    
    * Kernel: tcp: excessive resource consumption for TCP connections with low
    MSS allows remote denial of service (CVE-2019-11479)
    
    For more details about the security issue(s), including the impact, a CVSS
    score, acknowledgments, and other related information, refer to the CVE
    page(s) listed in the References section.
    
    Bug Fix(es):
    
    * kernel-rt: update to the RHEL8.0.z batch#1 source tree (BZ#1704955)
    
    4. Solution:
    
    For details on how to apply this update, which includes the changes
    described in this advisory, refer to:
    
    https://access.redhat.com/articles/11258
    
    The system must be rebooted for this update to take effect.
    
    5. Bugs fixed (https://bugzilla.redhat.com/):
    
    1686136 - CVE-2019-9213 kernel: lack of check for mmap minimum address in expand_downwards in mm/mmap.c leads to NULL pointer dereferences exploit on non-SMAP platforms
    1719123 - CVE-2019-11477 Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service
    1719128 - CVE-2019-11478 Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service
    1719129 - CVE-2019-11479 Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service
    
    6. Package List:
    
    Red Hat Enterprise Linux Real Time for NFV (v. 8):
    
    Source:
    kernel-rt-4.18.0-80.4.2.rt9.152.el8_0.src.rpm
    
    x86_64:
    kernel-rt-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-core-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-core-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-devel-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-kvm-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-kvm-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-modules-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-modules-extra-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debuginfo-common-x86_64-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-devel-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-kvm-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-kvm-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-modules-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-modules-extra-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    
    Red Hat Enterprise Linux Real Time (v. 8):
    
    Source:
    kernel-rt-4.18.0-80.4.2.rt9.152.el8_0.src.rpm
    
    x86_64:
    kernel-rt-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-core-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-core-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-devel-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-kvm-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-modules-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debug-modules-extra-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-debuginfo-common-x86_64-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-devel-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-kvm-debuginfo-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-modules-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    kernel-rt-modules-extra-4.18.0-80.4.2.rt9.152.el8_0.x86_64.rpm
    
    These packages are GPG signed by Red Hat for security.  Our key and
    details on how to verify the signature are available from
    https://access.redhat.com/security/team/key/
    
    7. References:
    
    https://access.redhat.com/security/cve/CVE-2019-9213
    https://access.redhat.com/security/cve/CVE-2019-11477
    https://access.redhat.com/security/cve/CVE-2019-11478
    https://access.redhat.com/security/cve/CVE-2019-11479
    https://access.redhat.com/security/updates/classification/#important
    https://access.redhat.com/security/vulnerabilities/tcpsack
    
    8. Contact:
    
    The Red Hat security contact is . More contact
    details at https://access.redhat.com/security/team/contact/
    
    Copyright 2019 Red Hat, Inc.
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