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    CVE-2019-11479

    Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.

    Published:Jun 17, 2019
    Last Modified:Nov 21, 2024
    EPS:Jun 18, 2019
    EPSS Score:0.13508
    CVSS Score:7.5

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    F5
    Product
    Big-ip Access Policy Manager
    Vendor
    F5
    Product
    Big-ip Advanced Firewall Manager
    Vendor
    F5
    Product
    Big-ip Analytics
    Vendor
    F5
    Product
    Big-ip Application Acceleration Manager
    Vendor
    F5
    Product
    Big-ip Application Security Manager
    Vendor
    F5
    Product
    Big-ip Domain Name System
    Vendor
    F5
    Product
    Big-ip Edge Gateway
    Vendor
    F5
    Product
    Big-ip Fraud Protection Service
    Vendor
    F5
    Product
    Big-ip Global Traffic Manager
    Vendor
    F5
    Product
    Big-ip Link Controller
    Vendor
    F5
    Product
    Big-ip Local Traffic Manager
    Vendor
    F5
    Product
    Big-ip Policy Enforcement Manager
    Vendor
    F5
    Product
    Big-ip Webaccelerator
    Vendor
    F5
    Product
    Big-iq Centralized Management
    Vendor
    F5
    Product
    Enterprise Manager
    Vendor
    F5
    Product
    Iworkflow
    Vendor
    F5
    Product
    Traffix Signaling Delivery Controller
    Vendor
    Linux
    Product
    Linux Kernel
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Mrg
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Extras Rt
    Vendor
    Redhat
    Product
    Rhel Tus
    Vendor
    Redhat
    Product
    Virtualization Host

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
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    References

    http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt
    http://www.openwall.com/lists/oss-security/2019/06/28/2
    http://www.openwall.com/lists/oss-security/2019/07/06/3
    http://www.openwall.com/lists/oss-security/2019/07/06/4
    http://www.securityfocus.com/bid/108818
    https://access.redhat.com/errata/RHSA-2019:1594
    https://access.redhat.com/errata/RHSA-2019:1602
    https://access.redhat.com/errata/RHSA-2019:1699
    https://access.redhat.com/security/vulnerabilities/tcpsack
    https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf
    https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5f3e2bf008c2221478101ee72f5cb4654b9fc363
    https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6
    https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
    https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193
    https://kc.mcafee.com/corporate/index?page=content&id=SB10287
    https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0008
    https://security.netapp.com/advisory/ntap-20190625-0001/
    https://support.f5.com/csp/article/K35421172
    https://support.f5.com/csp/article/K35421172?utm_source=f5support&amp%3Butm_medium=RSS
    https://usn.ubuntu.com/4041-1/
    https://usn.ubuntu.com/4041-2/
    https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic
    https://www.kb.cert.org/vuls/id/905115
    https://www.oracle.com/security-alerts/cpujan2020.html
    https://www.oracle.com/security-alerts/cpuoct2020.html
    https://www.synology.com/security/advisory/Synology_SA_19_28
    https://www.us-cert.gov/ics/advisories/icsa-19-253-03
    https://www.us-cert.gov/ics/advisories/icsma-20-170-06
    http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt
    http://www.openwall.com/lists/oss-security/2019/06/28/2
    http://www.openwall.com/lists/oss-security/2019/07/06/3
    http://www.openwall.com/lists/oss-security/2019/07/06/4
    http://www.securityfocus.com/bid/108818
    https://access.redhat.com/errata/RHSA-2019:1594
    https://access.redhat.com/errata/RHSA-2019:1602
    https://access.redhat.com/errata/RHSA-2019:1699
    https://access.redhat.com/security/vulnerabilities/tcpsack
    https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf
    https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5f3e2bf008c2221478101ee72f5cb4654b9fc363
    https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6
    https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
    https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193
    https://kc.mcafee.com/corporate/index?page=content&id=SB10287
    https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0008
    https://security.netapp.com/advisory/ntap-20190625-0001/
    https://support.f5.com/csp/article/K35421172
    https://support.f5.com/csp/article/K35421172?utm_source=f5support&amp%3Butm_medium=RSS
    https://usn.ubuntu.com/4041-1/
    https://usn.ubuntu.com/4041-2/
    https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic
    https://www.kb.cert.org/vuls/id/905115
    https://www.oracle.com/security-alerts/cpujan2020.html
    https://www.oracle.com/security-alerts/cpuoct2020.html
    https://www.synology.com/security/advisory/Synology_SA_19_28
    https://www.us-cert.gov/ics/advisories/icsa-19-253-03
    https://www.us-cert.gov/ics/advisories/icsma-20-170-06

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High