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

Published Jun 17, 2019
·
Updated

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 expanddownwards 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)

Affected Software

17 affected componentsFixes available
redhat/kernel-rt<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-core<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-debug<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-debug-core<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-debug-debuginfo<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-debug-devel<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-debug-kvm-debuginfo<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-debug-modules<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-debug-modules-extra<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-debuginfo<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-devel<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-kvm-debuginfo<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-modules<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-modules-extra<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-debug-kvm<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel-rt-kvm<4.18.0-80.4.2.rt9.152.el8_0
4.18.0-80.4.2.rt9.152.el8_0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  2. Upgrade

    Upgrade redhat/kernel-rt-core to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  3. Upgrade

    Upgrade redhat/kernel-rt-debug to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  4. Upgrade

    Upgrade redhat/kernel-rt-debug-core to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  5. Upgrade

    Upgrade redhat/kernel-rt-debug-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  6. Upgrade

    Upgrade redhat/kernel-rt-debug-devel to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  7. Upgrade

    Upgrade redhat/kernel-rt-debug-kvm to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  8. Upgrade

    Upgrade redhat/kernel-rt-debug-kvm-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  9. Upgrade

    Upgrade redhat/kernel-rt-debug-modules to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  10. Upgrade

    Upgrade redhat/kernel-rt-debug-modules-extra to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  11. Upgrade

    Upgrade redhat/kernel-rt-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  12. Upgrade

    Upgrade redhat/kernel-rt-devel to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  13. Upgrade

    Upgrade redhat/kernel-rt-kvm to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  14. Upgrade

    Upgrade redhat/kernel-rt-kvm-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  15. Upgrade

    Upgrade redhat/kernel-rt-modules to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0
  16. Upgrade

    Upgrade redhat/kernel-rt-modules-extra to a version that resolves this vulnerability.

    Fixed in 4.18.0-80.4.2.rt9.152.el8_0

Event History

Jul 1, 2026
Advisory Published
via Red Hat·11:13 AM
Data Sourced
via Red Hat·11:13 AM
RemedyDescriptionAffected Software
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Frequently Asked Questions

1

What is the severity of RHSA-2019:1480?

The severity of RHSA-2019:1480 is classified as important.

2

How do I fix RHSA-2019:1480?

To fix RHSA-2019:1480, upgrade the affected packages to version 4.18.0-80.4.2.rt9.152.el8_0 or later.

3

What packages are affected by RHSA-2019:1480?

Affected packages include kernel-rt, kernel-rt-core, and other related kernel-rt packages.

4

What type of vulnerability is associated with RHSA-2019:1480?

RHSA-2019:1480 is associated with an integer overflow flaw in the Linux kernel's networking subsystem.

5

Is RHSA-2019:1480 related to real-time systems?

Yes, RHSA-2019:1480 specifically addresses vulnerabilities in the real-time Linux kernel (kernel-rt) used for high determinism requirements.

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