RHSA-2019:2809 - Security Advisory

Topic

An update for kernel-alt 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.

Description

The kernel-alt packages provide the Linux kernel version 4.x.

Security Fix(es):

• Kernel: page cache side channel attacks (CVE-2019-5489)
• Kernel: KVM: potential use-after-free via kvm_ioctl_create_device() (CVE-2019-6974)
• kernel: broken permission and object lifetime handling for PTRACE_TRACEME (CVE-2019-13272)

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-alt]: BUG: unable to handle kernel NULL pointer IP: crypto_remove_spawns+0x118/0x2e0 (BZ#1536967)
• [HPE Apache] update ssif max_xmit_msg_size limit for multi-part messages (BZ#1610534)
• RHEL-Alt-7.6 - powerpc/pseries: Fix unitialized timer reset on migration / powerpc/pseries/mobility: Extend start/stop topology update scope (LPM) (BZ#1673613)
• RHEL-Alt-7.6 - s390: sha3_generic module fails and triggers panic when in FIPS mode (BZ#1673979)
• RHEL-Alt-7.6 - System crashed after oom - During ICP deployment (BZ#1710304)
• kernel-alt: Race condition in hashtables [rhel-alt-7.6.z] (BZ#1712127)
• RHEL-Alt-7.6 - OP930:PM_Test:cpupower -r command set values for first 3 cores in quad and misses last core. (CORAL) (BZ#1717836)
• RHEL-Alt-7.6 - disable runtime NUMA remapping for PRRN/LPM/VPHN (BZ#1717906)
• fragmented packets timing out (BZ#1729066)
• Backport TCP follow-up for small buffers (BZ#1733617)

Enhancement(s):

• RHEL-Alt-7.6 - perfevent PMDA cannot create file descriptors for reading nest events using the perf API (pcp/kernel) (CORAL) (BZ#1723036)

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.

Affected Products

• Red Hat Enterprise Linux for ARM 64 7 aarch64
• Red Hat Enterprise Linux for Power 9 7 ppc64le
• Red Hat Enterprise Linux for IBM System z (Structure A) 7 s390x

Fixes

• BZ - 1664110 - CVE-2019-5489 Kernel: page cache side channel attacks
• BZ - 1671913 - CVE-2019-6974 Kernel: KVM: potential use-after-free via kvm_ioctl_create_device()
• BZ - 1730895 - CVE-2019-13272 kernel: broken permission and object lifetime handling for PTRACE_TRACEME

CVEs

• CVE-2019-5489
• CVE-2019-6974
• CVE-2019-13272

References

• https://access.redhat.com/security/updates/classification/#important