Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.

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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: Use-after-free vulnerability in DCCP socket (CVE-2017-8824, Important)
  
• kernel: v4l2: disabled memory access protection mechanism allowing privilege escalation (CVE-2017-13166, Important)
  
• kernel: Incorrect type conversion for size during dma allocation (CVE-2017-9725, Moderate)
  
• kernel: Use-after-free in snd_seq_ioctl_create_port() (CVE-2017-15265, Moderate)
  
• kernel: Missing namespace check in net/netlink/af_netlink.c allows for network monitors to observe systemwide activity (CVE-2017-17449, Moderate)
  
• kernel: netfilter: use-after-free in tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c (CVE-2017-18017, Moderate)
  
• kernel: Stack information leak in the EFS element (CVE-2017-1000410, Moderate)
  

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank Mohamed Ghannam for reporting CVE-2017-8824 and Armis Labs for reporting CVE-2017-1000410.

Bug Fix(es):

• The kernel-rt packages have been upgraded to version 3.10.0-693.25.2.rt56.612, which provides a number of security and bug fixes over the previous version. (BZ#1549731)
  
• Intel Core X-Series (Skylake) processors use a hardcoded Time Stamp Counter (TSC) frequency of 25 MHz. In some cases this can be imprecise and lead to timing-related problems such as time drift, timers being triggered early, or TSC clock instability. This update mitigates these problems by no longer using the "native_calibrate_tsc()" function to define the TSC frequency. Refined calibration is now used to update the clock rate accordingly in these cases. (BZ#1547854)

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

• MRG Realtime 2 x86_64

Fixes

• BZ - 1489088 - CVE-2017-9725 kernel: Incorrect type conversion for size during dma allocation
• BZ - 1501878 - CVE-2017-15265 kernel: Use-after-free in snd_seq_ioctl_create_port()
• BZ - 1519160 - CVE-2017-1000410 kernel: Stack information leak in the EFS element
• BZ - 1519591 - CVE-2017-8824 kernel: Use-after-free vulnerability in DCCP socket
• BZ - 1525762 - CVE-2017-17449 kernel: Missing namespace check in net/netlink/af_netlink.c allows for network monitors to observe systemwide activity
• BZ - 1531135 - CVE-2017-18017 kernel: netfilter: use-after-free in tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c
• BZ - 1547854 - Latest rt56 real time kernel on Intel i9 has broken TSC
• BZ - 1548412 - CVE-2017-13166 kernel: v4l2: disabled memory access protection mechanism allowing privilege escalation
• BZ - 1549731 - update the MRG 2.5.z 3.10 kernel-rt sources

CVEs

• CVE-2017-8824
• CVE-2017-9725
• CVE-2017-13166
• CVE-2017-15265
• CVE-2017-17449
• CVE-2017-18017
• CVE-2017-1000410

References

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

MRG Realtime 2

SRPM
kernel-rt-3.10.0-693.25.2.rt56.612.el6rt.src.rpm	SHA-256: 49dcd0226182020f3ed9843e7f319c0b13cf1d2bdcd1a8b7c3dad7bc4e35a8ab
x86_64
kernel-rt-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: edb7fc5c2b21b9b704e0c4fe942b21c40c28a2713addca659a3996b4dcaaa0af
kernel-rt-debug-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: 76f738ded627fc923dcd6d0b5fd659928fa33ee231228f946287dde95f827d54
kernel-rt-debug-debuginfo-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: 40028bd119d8601b408f9112c37e7b63385d2964a52690af052c5d2bc60dd021
kernel-rt-debug-devel-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: f9c0504d7a0c517b3d302aa06301242ef58a296e8f7fe98998815595a37ff940
kernel-rt-debuginfo-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: e648df44c16f7fc69c0bfd6d47f42f18b5d2d2fcf8f4f149607ab7edc3554a92
kernel-rt-debuginfo-common-x86_64-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: 712eecaeb6e83ea980ef7a6d7062742d4cca4dc9cd7a415f65b81febc36d5052
kernel-rt-devel-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: ccf51d695b0fec2d50e878bae037b1730d04dbcbe036de11bc56ecded440c54e
kernel-rt-doc-3.10.0-693.25.2.rt56.612.el6rt.noarch.rpm	SHA-256: 2561efea6987db0d3a94e5254dff1ef075b50a84935db5cb0c9b92e2223d638c
kernel-rt-firmware-3.10.0-693.25.2.rt56.612.el6rt.noarch.rpm	SHA-256: e894625cd53c5c9427981bf64c12b0c3a7a9a7e55918bcd65459aa73943741f6
kernel-rt-trace-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: 0050fed9417aadba1726f265067ac1e58ea1fd7caab2147e10ce350b07b90eda
kernel-rt-trace-debuginfo-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: 07fd70db161b7c6769c0d903abf01420fb86ef58ba6902a0d2b2b3b93a0ef316
kernel-rt-trace-devel-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: 3d646371831b0a10d77b99b297c918b94771b7b2c907bfbed667e30af15f39b6
kernel-rt-vanilla-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: 6cc7220bfa5827db895b82aacb6a2e08a3e41facc5c78dec678c57d538098b2f
kernel-rt-vanilla-debuginfo-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: c3beeed3455117b5e457659c480f150dd8633785ee3b730c7f7bc5479bbdc5a5
kernel-rt-vanilla-devel-3.10.0-693.25.2.rt56.612.el6rt.x86_64.rpm	SHA-256: d5bc60c16764c3439f534bfd49f9e88bb531ffd307a70cb181e8c1c179e67559