7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.001 Low
EPSS
Percentile
30.0%
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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 12 | all | linux | < 4.15.17-1 | linux_4.15.17-1_all.deb |
Debian | 11 | all | linux | < 4.15.17-1 | linux_4.15.17-1_all.deb |
Debian | 10 | all | linux | < 4.15.17-1 | linux_4.15.17-1_all.deb |
Debian | 999 | all | linux | < 4.15.17-1 | linux_4.15.17-1_all.deb |
Debian | 13 | all | linux | < 4.15.17-1 | linux_4.15.17-1_all.deb |
Debian | 12 | all | xen | < 4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6 | xen_4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6_all.deb |
Debian | 11 | all | xen | < 4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6 | xen_4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6_all.deb |
Debian | 10 | all | xen | < 4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6 | xen_4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6_all.deb |
Debian | 999 | all | xen | < 4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6 | xen_4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6_all.deb |
Debian | 13 | all | xen | < 4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6 | xen_4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6_all.deb |
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.001 Low
EPSS
Percentile
30.0%