| Summary: | Several vulnerabilities have been discovered in the Linux kernel that may;lead to a privilege escalation, denial of service or information leaks.;;CVE-2017-5715;Multiple researchers have discovered a vulnerability in various;processors supporting speculative execution, enabling an attacker;controlling an unprivileged process to read memory from arbitrary;addresses, including from the kernel and all other processes running on;the system.;;This specific attack has been named Spectre variant 2 (branch target;injection) and is mitigated in the Linux kernel for the Intel x86-64;architecture by using the retpoline;compiler feature which allows;indirect branches to be isolated from speculative execution.;;CVE-2017-5754;Multiple researchers have discovered a vulnerability in Intel;processors, enabling an attacker controlling an unprivileged process to;read memory from arbitrary addresses, including from the kernel and all;other processes running on the system.;;This specific attack has been named Meltdown and is addressed in the;Linux kernel on the powerpc/ppc64el architectures by flushing the L1;data cache on exit from kernel mode to user mode (or from hypervisor to;kernel).;;This works on Power7, Power8 and Power9 processors.;;CVE-2017-13166;A bug in the 32-bit compatibility layer of the v4l2 IOCTL handling code;has been found. Memory protections ensuring user-provided buffers always;point to userland memory were disabled, allowing destination address to;be in kernel space. This bug could be exploited by an attacker to;overwrite kernel memory from an unprivileged userland process, leading;to privilege escalation.;;CVE-2018-5750;An information leak has been found in the Linux kernel. The;acpi_smbus_hc_add() prints a kernel address in the kernel log at every;boot, which could be used by an attacker on the system to defeat kernel;ASLR.;;Additionally to those vulnerability, some mitigations for CVE-2017-5753;are;included in this release.;;CVE-2017-5753;Multiple researchers have discovered a vulnerability in various;processors supporting speculative execution, enabling an attacker;controlling an unprivileged process to read memory from arbitrary;addresses, including from the kernel and all other processes running on;the system.;;This specific attack has been named Spectre variant 1 (bounds-check;bypass) and is mitigated in the Linux kernel architecture by identifying;vulnerable code sections (array bounds checking followed by array;access) and replacing the array access with the speculation-safe;array_index_nospec() function.;;More use sites will be added over time. |
| Description: | Summary:
Several vulnerabilities have been discovered in the Linux kernel that may
lead to a privilege escalation, denial of service or information leaks.
CVE-2017-5715
Multiple researchers have discovered a vulnerability in various
processors supporting speculative execution, enabling an attacker
controlling an unprivileged process to read memory from arbitrary
addresses, including from the kernel and all other processes running on
the system.
This specific attack has been named Spectre variant 2 (branch target
injection) and is mitigated in the Linux kernel for the Intel x86-64
architecture by using the retpoline
compiler feature which allows
indirect branches to be isolated from speculative execution.
CVE-2017-5754
Multiple researchers have discovered a vulnerability in Intel
processors, enabling an attacker controlling an unprivileged process to
read memory from arbitrary addresses, including from the kernel and all
other processes running on the system.
This specific attack has been named Meltdown and is addressed in the
Linux kernel on the powerpc/ppc64el architectures by flushing the L1
data cache on exit from kernel mode to user mode (or from hypervisor to
kernel).
This works on Power7, Power8 and Power9 processors.
CVE-2017-13166
A bug in the 32-bit compatibility layer of the v4l2 IOCTL handling code
has been found. Memory protections ensuring user-provided buffers always
point to userland memory were disabled, allowing destination address to
be in kernel space. This bug could be exploited by an attacker to
overwrite kernel memory from an unprivileged userland process, leading
to privilege escalation.
CVE-2018-5750
An information leak has been found in the Linux kernel. The
acpi_smbus_hc_add() prints a kernel address in the kernel log at every
boot, which could be used by an attacker on the system to defeat kernel
ASLR.
Additionally to those vulnerability, some mitigations for CVE-2017-5753
are
included in this release.
CVE-2017-5753
Multiple researchers have discovered a vulnerability in various
processors supporting speculative execution, enabling an attacker
controlling an unprivileged process to read memory from arbitrary
addresses, including from the kernel and all other processes running on
the system.
This specific attack has been named Spectre variant 1 (bounds-check
bypass) and is mitigated in the Linux kernel architecture by identifying
vulnerable code sections (array bounds checking followed by array
access) and replacing the array access with the speculation-safe
array_index_nospec() function.
More use sites will be added over time.
Affected Software/OS:
linux on Debian Linux
Solution:
For the stable distribution (stretch), these problems have been fixed in
version 4.9.82-1+deb9u2.
We recommend that you upgrade your linux packages.
CVSS Score:
4.7
CVSS Vector:
AV:L/AC:M/Au:N/C:C/I:N/A:N
|
