CVE 2018-8897
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.
Related bugs and status
CVE-2018-8897 (Candidate) is related to these bugs:
Summary | In | Importance | Status | |||
---|---|---|---|---|---|---|
1759303 | Update Aquantia driver to fix various issues | linux (Ubuntu) | Medium | Fix Released | ||
1759303 | Update Aquantia driver to fix various issues | HWE Next | Undecided | Fix Released | ||
1759303 | Update Aquantia driver to fix various issues | linux-oem (Ubuntu) | Undecided | Fix Released | ||
1759303 | Update Aquantia driver to fix various issues | linux (Ubuntu Xenial) | Undecided | Invalid | ||
1759303 | Update Aquantia driver to fix various issues | linux-oem (Ubuntu Xenial) | Undecided | Fix Released |
Summary | In | Importance | Status | |||
---|---|---|---|---|---|---|
1766197 | Update btusb reset-resume quirk to decrease power usage | linux-oem (Ubuntu) | Undecided | Invalid | ||
1766197 | Update btusb reset-resume quirk to decrease power usage | HWE Next | Undecided | Fix Released | ||
1766197 | Update btusb reset-resume quirk to decrease power usage | linux-oem (Ubuntu Xenial) | Undecided | Fix Released |
Summary | In | Importance | Status | |||
---|---|---|---|---|---|---|
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | linux-oem (Ubuntu) | Undecided | Invalid | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | linux-oem (Ubuntu Xenial) | Medium | Fix Released | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow | Medium | Fix Released | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow automated-testing | Medium | Fix Released | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow certification-testing | Medium | Fix Released | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow prepare-package | Medium | Fix Released | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow prepare-package-meta | Medium | Fix Released | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow prepare-package-signed | Medium | Fix Released | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow promote-to-proposed | Medium | Fix Released | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow promote-to-security | Medium | Invalid | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow promote-to-updates | Medium | Invalid | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow regression-testing | Medium | Invalid | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow security-signoff | Medium | Invalid | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow upload-to-ppa | Medium | New | ||
1769996 | linux-oem: 4.13.0-1027.30 -proposed tracker | Kernel SRU Workflow verification-testing | Medium | Fix Released |