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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Oracle Issues Fix for Oracle Linux) Linux Kernel Cache Invalidation Bug Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1041864
SecurityTracker URL:  http://securitytracker.com/id/1041864
CVE Reference:   CVE-2018-17182   (Links to External Site)
Date:  Oct 11 2018
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Oracle Linux 6, Oracle Linux 7
Description:   A vulnerability was reported in the Linux kernel. A local user can obtain elevated privileges on the target system.

A local user can run a specially crafted application to trigger an overflow in the cache invalidation optimization and execute arbitrary code on the target system with elevated privileges.

The original advisory is available at:

https://bugs.chromium.org/p/project-zero/issues/detail?id=1664

Additional information is available at:

https://googleprojectzero.blogspot.com/2018/09/a-cache-invalidation-bug-in-linux.html

Jann Horn of Google Project Zero reported this vulnerability.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   Oracle has issued a fix.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2018-4244.html

Vendor URL:  linux.oracle.com/errata/ELSA-2018-4244.html (Links to External Site)
Cause:   Boundary error

Message History:   This archive entry is a follow-up to the message listed below.
Oct 1 2018 Linux Kernel Cache Invalidation Bug Lets Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [El-errata] ELSA-2018-4244 Important: Oracle Linux 6 Unbreakable Enterprise kernel security update

Oracle Linux Security Advisory ELSA-2018-4244

http://linux.oracle.com/errata/ELSA-2018-4244.html

The following updated rpms for Oracle Linux 6 have been uploaded to the 
Unbreakable Linux Network:

x86_64:
kernel-uek-doc-4.1.12-124.20.1.el6uek.noarch.rpm
kernel-uek-firmware-4.1.12-124.20.1.el6uek.noarch.rpm
kernel-uek-4.1.12-124.20.1.el6uek.x86_64.rpm
kernel-uek-devel-4.1.12-124.20.1.el6uek.x86_64.rpm
kernel-uek-debug-4.1.12-124.20.1.el6uek.x86_64.rpm
kernel-uek-debug-devel-4.1.12-124.20.1.el6uek.x86_64.rpm


SRPMS:
http://oss.oracle.com/ol6/SRPMS-updates/kernel-uek-4.1.12-124.20.1.el6uek.src.rpm



Description of changes:

[4.1.12-124.20.1.el6uek]
- bnxt_en: xdp: don't make drivers report attachment mode (partial 
backport) (Somasundaram Krishnasamy)  [Orabug: 27988326]
- bpf: make bnxt compatible w/ bpf_xdp_adjust_tail (Nikita V. Shirokov) 
[Orabug: 27988326]
- bnxt_en: add meta pointer for direct access (partial backport) 
(Somasundaram Krishnasamy)  [Orabug: 27988326]
- bnxt_en: Fix bug in ethtool -L. (Michael Chan)  [Orabug: 27988326]
- bpf: bnxt: Report bpf_prog ID during XDP_QUERY_PROG (Martin KaFai Lau) 
  [Orabug: 27988326]
- bnxt_en: Optimize doorbell write operations for newer chips (reapply). 
(Michael Chan)  [Orabug: 27988326]
- bnxt_en: Use short TX BDs for the XDP TX ring. (Michael Chan) 
[Orabug: 27988326]
- bnxt_en: Add ethtool mac loopback self test (reapply). (Michael Chan) 
[Orabug: 27988326]
- bnxt_en: Add support for XDP_TX action. (Michael Chan)  [Orabug: 
27988326]
- bnxt_en: Add basic XDP support. (Michael Chan)  [Orabug: 27988326]
- x86/ia32: Restore r8 correctly in 32bit SYSCALL instruction entry. 
(Gayatri Vasudevan)  [Orabug: 28529706]
- net: enable RPS on vlan devices (Shannon Nelson)  [Orabug: 28645929]
- xen-blkback: hold write vbd-lock while swapping the vbd (Ankur Arora) 
[Orabug: 28651655]
- xen-blkback: implement swapping of active vbd (Ankur Arora)  [Orabug: 
28651655]
- xen-blkback: emit active physical device to xenstore (Ankur Arora) 
[Orabug: 28651655]
- xen-blkback: refactor backend_changed() (Ankur Arora)  [Orabug: 28651655]
- xen-blkback: pull out blkif grant features from vbd (Ankur Arora) 
[Orabug: 28651655]
- mm: get rid of vmacache_flush_all() entirely (Linus Torvalds) 
[Orabug: 28701016]  {CVE-2018-17182}

[4.1.12-124.19.9.el6uek]
- rds: crash at rds_ib_inc_copy_to_user+104 due to NULL ptr reference 
(Venkat Venkatsubra)  [Orabug: 28506569]

[4.1.12-124.19.8.el6uek]
- IB/core: For multicast functions, verify that LIDs are multicast LIDs 
(Michael J. Ruhl)  [Orabug: 28700490]

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