RHSA-2019:1485: Important: kernel security and bug fix update

Published Jun 17, 2019
·
Updated

The kernel packages contain the Linux kernel, the core of any Linux operating system.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.Bug Fix(es): THP: Race between MADVDONTNEED and NUMA hinting node migration code (BZ#1698103) [RHEL7] mdclear flag missing from /proc/cpuinfo on late microcode update (BZ#1712989) [RHEL7] MDS mitigations are not enabled after double microcode update (BZ#1712994) WARNING: CPU: 0 PID: 0 at kernel/jumplabel.c:90 statickeyslowdec+0xa6/0xb0 (BZ#1713000)

Affected Software

18 affected componentsFixes available
redhat/kernel<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-abi-whitelists<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-debug<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-debug-debuginfo<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-debug-devel<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-debuginfo<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-devel<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-doc<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-headers<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-tools<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-tools-debuginfo<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-tools-libs<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/kernel-tools-libs-devel<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/perf<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/perf-debuginfo<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/python-perf<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7
redhat/python-perf-debuginfo<3.10.0-327.79.2.el7
3.10.0-327.79.2.el7

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  2. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  3. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  4. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  5. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  6. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  7. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  8. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  9. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  10. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  11. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  12. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  13. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  14. Upgrade

    Upgrade redhat/perf to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  15. Upgrade

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

    Fixed in 3.10.0-327.79.2.el7
  16. Upgrade

    Upgrade redhat/python-perf to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  17. Upgrade

    Upgrade redhat/python-perf-debuginfo to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  18. Upgrade

    Upgrade kernel (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  19. Upgrade

    Upgrade kernel-abi-whitelists (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  20. Upgrade

    Upgrade kernel-debug (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  21. Upgrade

    Upgrade kernel-debug-debuginfo (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  22. Upgrade

    Upgrade kernel-debug-devel (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  23. Upgrade

    Upgrade kernel-debuginfo (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  24. Upgrade

    Upgrade kernel-debuginfo-common-x86_64 (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  25. Upgrade

    Upgrade kernel-devel (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  26. Upgrade

    Upgrade kernel-doc (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  27. Upgrade

    Upgrade kernel-headers (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  28. Upgrade

    Upgrade kernel-tools (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  29. Upgrade

    Upgrade kernel-tools-debuginfo (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  30. Upgrade

    Upgrade kernel-tools-libs (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  31. Upgrade

    Upgrade kernel-tools-libs-devel (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  32. Upgrade

    Upgrade perf (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  33. Upgrade

    Upgrade perf-debuginfo (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  34. Upgrade

    Upgrade python-perf (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7
  35. Upgrade

    Upgrade python-perf-debuginfo (EL7) to a version that resolves this vulnerability.

    Fixed in 3.10.0-327.79.2.el7

Event History

Jul 6, 2026
Advisory Published
via Red Hat·11:49 AM
Data Sourced
via Red Hat·11:49 AM
RemedyDescriptionAffected Software
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Frequently Asked Questions

1

What is the severity of RHSA-2019:1485?

The severity of RHSA-2019:1485 is categorized as high due to the integer overflow vulnerability in the Linux kernel's networking subsystem.

2

How do I fix RHSA-2019:1485?

To fix RHSA-2019:1485, you need to update your kernel to version 3.10.0-327.79.2.el7 or later.

3

What types of systems are affected by RHSA-2019:1485?

RHSA-2019:1485 affects systems running the specified versions of the Linux kernel on Red Hat Enterprise Linux 7.

4

What is an integer overflow flaw in the context of RHSA-2019:1485?

An integer overflow flaw in RHSA-2019:1485 allows attackers to potentially exploit the networking subsystem of the Linux kernel.

5

Are there any specific packages impacted by RHSA-2019:1485?

Yes, specific packages impacted by RHSA-2019:1485 include kernel, kernel-debug, kernel-devel, and other related kernel packages for RHEL 7.

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