CVE-2018-8897

Priority
Description
A statement in the System Programming Guide of the Intel 64 and IA-32
Architectures Software Developer's Manual (SDM) was mishandled in the
development of some or all operating-system kernels, resulting in
unexpected behavior for #DB exceptions that are deferred by MOV SS or POP
SS, as demonstrated by (for example) privilege escalation in Windows,
macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The
MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data
breakpoints, and single step trap exceptions until the instruction boundary
following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited
data breakpoints are those on memory accessed by the MOV to SS or POP to SS
instruction itself.) Note that debug exceptions are not inhibited by the
interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the
instruction following the MOV to SS or POP to SS instruction is an
instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to
the operating system at CPL < 3, the debug exception is delivered after the
transfer to CPL < 3 is complete. OS kernels may not expect this order of
events and may therefore experience unexpected behavior when it occurs.
Ubuntu-Description
Nick Peterson discovered that the Linux kernel did not properly handle
debug exceptions following a MOV/POP to SS instruction. A local attacker
could use this to cause a denial of service (system crash). This issue only
affected the amd64 architecture.
Notes
 tyhicks> Thanks to Andy Lutomirski for help in Linux kernel research and test
  case
Package
Source: linux (LP Ubuntu Debian)
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):released (3.2.0-134.180)
Ubuntu 14.04 LTS (Trusty Tahr):released (3.13.0-147.196)
Ubuntu 16.04 LTS (Xenial Xerus):released (4.4.0-124.148)
Ubuntu 18.04 LTS (Bionic Beaver):not-affected (landed pre-release in 4.15.0-15.16)
Ubuntu 18.10 (Cosmic Cuttlefish):not-affected (landed pre-release in 4.15.0-15.16)
Patches:
Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2Fixed by d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):released (4.4.0-1019.19)
Ubuntu 16.04 LTS (Xenial Xerus):released (4.4.0-1057.66)
Ubuntu 18.04 LTS (Bionic Beaver):not-affected (4.15.0-1003.3)
Ubuntu 18.10 (Cosmic Cuttlefish):not-affected (4.15.0-1007.7)
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):not-affected (4.15.0-1023.24~14.04.1)
Ubuntu 16.04 LTS (Xenial Xerus):released (4.13.0-1016.19)
Ubuntu 18.04 LTS (Bionic Beaver):not-affected (4.15.0-1004.4)
Ubuntu 18.10 (Cosmic Cuttlefish):not-affected (4.15.0-1009.9)
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):released (4.4.0-9027.29)
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored (abandoned)
Ubuntu 16.04 LTS (Xenial Xerus):ignored (abandoned)
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):released (4.13.0-1015.19)
Ubuntu 18.04 LTS (Bionic Beaver):not-affected (4.15.0-1003.3)
Ubuntu 18.10 (Cosmic Cuttlefish):not-affected (4.15.0-1006.6)
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):ignored (was needs-triage now end-of-life)
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored (abandoned)
Ubuntu 16.04 LTS (Xenial Xerus):ignored (was needs-triage now end-of-life)
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored (abandoned)
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):released (4.13.0-41.46~16.04.1)
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):released (4.13.0-41.46~16.04.1)
Ubuntu 18.04 LTS (Bionic Beaver):pending (4.18.0-8.9~18.04.1)
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
linux-krillin:not-affected (x86 only)
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):released (4.4.0-1023.28)
Ubuntu 18.04 LTS (Bionic Beaver):not-affected (4.15.0-1004.4)
Ubuntu 18.10 (Cosmic Cuttlefish):not-affected (4.15.0-1008.8)
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):released (3.13.0-147.196~precise1)
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored (end-of-life)
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored (end-of-life)
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored (end-of-life)
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):released (4.4.0-124.148~14.04.1)
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored (abandoned)
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored (abandoned)
Ubuntu 16.04 LTS (Xenial Xerus):ignored (abandoned)
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored (abandoned)
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):released (4.13.0-1026.29)
Ubuntu 18.04 LTS (Bionic Beaver):not-affected (4.15.0-1002.3)
Ubuntu 18.10 (Cosmic Cuttlefish):not-affected (4.15.0-1004.5)
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):not-affected (x86 only)
Ubuntu 18.04 LTS (Bionic Beaver):not-affected (x86 only)
Ubuntu 18.10 (Cosmic Cuttlefish):not-affected (x86 only)
Package
Upstream:released (4.16~rc7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):not-affected (x86 only)
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 18.10 (Cosmic Cuttlefish):DNE
Package
linux-vegetahd:not-affected (x86 only)
More Information

Updated: 2018-10-31 21:28:31 UTC (commit cfa7cf69d76449ccff972ac22f40976a08d908c2)