RedHat: RHSA-2019-1486:01 Important: kernel-rt security update

    Date17 Jun 2019
    CategoryRed Hat
    1319
    Posted ByLinuxSecurity Advisories
    An update for kernel-rt is now available for Red Hat Enterprise Linux 7. 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
    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA256
    
    =====================================================================
                       Red Hat Security Advisory
    
    Synopsis:          Important: kernel-rt security update
    Advisory ID:       RHSA-2019:1486-01
    Product:           Red Hat Enterprise Linux
    Advisory URL:      https://access.redhat.com/errata/RHSA-2019:1486
    Issue date:        2019-06-17
    CVE Names:         CVE-2019-11477 CVE-2019-11478 CVE-2019-11479 
    =====================================================================
    
    1. Summary:
    
    An update for kernel-rt is now available for Red Hat Enterprise Linux 7.
    
    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 Realtime (v. 7) - noarch, x86_64
    Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, 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: 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.
    
    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/):
    
    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 for Real Time for NFV (v. 7):
    
    Source:
    kernel-rt-3.10.0-957.21.3.rt56.935.el7.src.rpm
    
    noarch:
    kernel-rt-doc-3.10.0-957.21.3.rt56.935.el7.noarch.rpm
    
    x86_64:
    kernel-rt-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debug-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debug-debuginfo-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debug-devel-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debug-kvm-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debug-kvm-debuginfo-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debuginfo-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debuginfo-common-x86_64-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-devel-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-kvm-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-kvm-debuginfo-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-trace-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-trace-debuginfo-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-trace-devel-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-trace-kvm-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-trace-kvm-debuginfo-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    
    Red Hat Enterprise Linux Realtime (v. 7):
    
    Source:
    kernel-rt-3.10.0-957.21.3.rt56.935.el7.src.rpm
    
    noarch:
    kernel-rt-doc-3.10.0-957.21.3.rt56.935.el7.noarch.rpm
    
    x86_64:
    kernel-rt-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debug-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debug-debuginfo-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debug-devel-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debuginfo-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-debuginfo-common-x86_64-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-devel-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-trace-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-trace-debuginfo-3.10.0-957.21.3.rt56.935.el7.x86_64.rpm
    kernel-rt-trace-devel-3.10.0-957.21.3.rt56.935.el7.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-2019-11477
    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.
    -----BEGIN PGP SIGNATURE-----
    Version: GnuPG v1
    
    iQIVAwUBXQfxR9zjgjWX9erEAQhVbw/9EZjcbTKGqGgyVBrB3JvQ2iy/ad204ZOx
    oXE3qC5FuktU1dLha5pztyp6w3piInnU5LWN+9MqjjnYM/58VouvDyGvPaDSu43q
    MX4BJ/Dz7Nka5RrFGpsWsqcJJxbYtPgW7zy75WPs14t9rStlibs1RQoEwkkWH3+E
    bS3Zf143CpdMOczrvN1m2n43p0h69Bh3Q97qUtPthkL2RCpuSQJZDdok8k0BsCv7
    Amu0rI9IhMmD3Ft2GPPW4vbHyFSG3yZNbujcGYbxPh+XrBSffs2cv8GlFK2upLn4
    1H0uDz5zCrISs68W3UpoS/uUJ3mANFTj4MpBe/lHmZZHoGwF3UiyRm4AARhtcQX6
    HL/GH3nJMPBUdM5kIlo2XR5rSK8kl0Df8+UShfS5EyOuttSZZsYHP9kT5ljojuNO
    a2W7Ypuw1yFyumPNmvNbcGrKpXMVlSXs2JHR0w0vYKkjHdAZfjMycSBLbEtWqih7
    DPZzA3ui8e8Z/FqWpVjLI/2y3hwBJB/lXdHQGPk1Xv3u/La8HnUjyMzZPnOdMDiw
    NPxYF6dM/lOA2B2tpydBWt9w4LrbjIVb1J7TwtgiMjBP3SEuLKHI5DqDblTf5tmD
    tctoOasNFHvdVupJp/rXCEHPvVmMJBNhtPfDceKbHh/FgWEXmBr5lsts8Qc8Jmo2
    eP/3LDZ4QgA=
    =UQ0B
    -----END PGP SIGNATURE-----
    
    --
    RHSA-announce mailing list
    This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.redhat.com/mailman/listinfo/rhsa-announce
    
    You are not authorised to post comments.

    Comments powered by CComment

    LinuxSecurity Poll

    Do you read our distribution advisories on a regular basis?

    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).
    /component/communitypolls/?task=poll.vote&format=json
    23
    radio
    [{"id":"84","title":"Yes, for a single distribution","votes":"0","type":"x","order":"1","pct":0,"resources":[]},{"id":"85","title":"Yes, for multiple distributions","votes":"5","type":"x","order":"2","pct":62.5,"resources":[]},{"id":"86","title":"No","votes":"3","type":"x","order":"3","pct":37.5,"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

    Advisories

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