RedHat: RHSA-2019-1488:01 Important: kernel security and bug fix update
Summary
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: Double free in lib/idr.c (CVE-2019-3896)
* 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):
* MDS mitigations not enabled on Intel Skylake CPUs (BZ#1710081)
* RHEL6 kernel does not disable SMT with mds=full,nosmt (BZ#1710121)
* [RHEL6] md_clear flag missing from /proc/cpuinfo (BZ#1710517)
Summary
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.
References
https://access.redhat.com/security/cve/CVE-2019-3896 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
Package List
Red Hat Enterprise Linux Desktop (v. 6):
Source:
kernel-2.6.32-754.15.3.el6.src.rpm
i386:
kernel-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm
kernel-devel-2.6.32-754.15.3.el6.i686.rpm
kernel-headers-2.6.32-754.15.3.el6.i686.rpm
perf-2.6.32-754.15.3.el6.i686.rpm
perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
noarch:
kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm
kernel-doc-2.6.32-754.15.3.el6.noarch.rpm
kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm
x86_64:
kernel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm
kernel-devel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-headers-2.6.32-754.15.3.el6.x86_64.rpm
perf-2.6.32-754.15.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386:
kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm
perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
python-perf-2.6.32-754.15.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
x86_64:
kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
kernel-2.6.32-754.15.3.el6.src.rpm
noarch:
kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm
kernel-doc-2.6.32-754.15.3.el6.noarch.rpm
kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm
x86_64:
kernel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm
kernel-devel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-headers-2.6.32-754.15.3.el6.x86_64.rpm
perf-2.6.32-754.15.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64:
kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
kernel-2.6.32-754.15.3.el6.src.rpm
i386:
kernel-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm
kernel-devel-2.6.32-754.15.3.el6.i686.rpm
kernel-headers-2.6.32-754.15.3.el6.i686.rpm
perf-2.6.32-754.15.3.el6.i686.rpm
perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
noarch:
kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm
kernel-doc-2.6.32-754.15.3.el6.noarch.rpm
kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm
ppc64:
kernel-2.6.32-754.15.3.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-754.15.3.el6.ppc64.rpm
kernel-debug-2.6.32-754.15.3.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.ppc64.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-754.15.3.el6.ppc64.rpm
kernel-devel-2.6.32-754.15.3.el6.ppc64.rpm
kernel-headers-2.6.32-754.15.3.el6.ppc64.rpm
perf-2.6.32-754.15.3.el6.ppc64.rpm
perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm
s390x:
kernel-2.6.32-754.15.3.el6.s390x.rpm
kernel-debug-2.6.32-754.15.3.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.s390x.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-754.15.3.el6.s390x.rpm
kernel-devel-2.6.32-754.15.3.el6.s390x.rpm
kernel-headers-2.6.32-754.15.3.el6.s390x.rpm
kernel-kdump-2.6.32-754.15.3.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
kernel-kdump-devel-2.6.32-754.15.3.el6.s390x.rpm
perf-2.6.32-754.15.3.el6.s390x.rpm
perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
x86_64:
kernel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm
kernel-devel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-headers-2.6.32-754.15.3.el6.x86_64.rpm
perf-2.6.32-754.15.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 6):
i386:
kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm
perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
python-perf-2.6.32-754.15.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
ppc64:
kernel-debug-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-754.15.3.el6.ppc64.rpm
perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm
python-perf-2.6.32-754.15.3.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm
s390x:
kernel-debug-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-754.15.3.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
python-perf-2.6.32-754.15.3.el6.s390x.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
x86_64:
kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
kernel-2.6.32-754.15.3.el6.src.rpm
i386:
kernel-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm
kernel-devel-2.6.32-754.15.3.el6.i686.rpm
kernel-headers-2.6.32-754.15.3.el6.i686.rpm
perf-2.6.32-754.15.3.el6.i686.rpm
perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
noarch:
kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm
kernel-doc-2.6.32-754.15.3.el6.noarch.rpm
kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm
x86_64:
kernel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm
kernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm
kernel-devel-2.6.32-754.15.3.el6.x86_64.rpm
kernel-headers-2.6.32-754.15.3.el6.x86_64.rpm
perf-2.6.32-754.15.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 6):
i386:
kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm
perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
python-perf-2.6.32-754.15.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
x86_64:
kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-2.6.32-754.15.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-754.15.3.el6.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/
Topic
An update for kernel is now available for Red Hat Enterprise Linux 6.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.
Topic
Relevant Releases Architectures
Red Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64
Bugs Fixed
1694812 - CVE-2019-3896 kernel: Double free in lib/idr.c
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