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CVE-2018-15572

Status Candidate

Overview

The spectre_v2_select_mitigation function in arch/x86/kernel/cpu/bugs.c in the Linux kernel before 4.18.1 does not always fill RSB upon a context switch, which makes it easier for attackers to conduct userspace-userspace spectreRSB attacks.

Related Files

Ubuntu Security Notice USN-3777-3
Posted Oct 23, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3777-3 - USN-3777-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 %LTS. This update provides the corresponding updates for the Linux kernel for Azure Cloud systems. Jann Horn discovered that the vmacache subsystem did not properly handle sequence number overflows, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-5715, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594, CVE-2018-17182, CVE-2018-3639, CVE-2018-6554, CVE-2018-6555
SHA-256 | 769cc3a35204cab453698f34a6b0570d79e3ff0a88450698a2577c0e6fc6a664
Kernel Live Patch Security Notice LSN-0044-1
Posted Oct 8, 2018
Authored by Benjamin M. Romer

It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). It was discovered that the paravirtualization implementation in the Linux kernel did not properly handle some indirect calls, reducing the effectiveness of Spectre v2 mitigations for paravirtual guests. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux
advisories | CVE-2018-14633, CVE-2018-15572, CVE-2018-15594, CVE-2018-17182, CVE-2018-3620, CVE-2018-3646, CVE-2018-6555
SHA-256 | 1ae6dc1bc4438da330374ea7c963d1a59dd4454020d117a4fef1a28f4474b821
Ubuntu Security Notice USN-3777-2
Posted Oct 2, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3777-2 - USN-3777-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 18.04 LTS for Ubuntu 16.04 LTS. Jann Horn discovered that the vmacache subsystem did not properly handle sequence number overflows, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-10853, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594, CVE-2018-17182, CVE-2018-6554, CVE-2018-6555
SHA-256 | 19e56ea426f696a74aa692607d87804e67eeaa6dfd9e083466313919a494c760
Ubuntu Security Notice USN-3777-1
Posted Oct 2, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3777-1 - Jann Horn discovered that the vmacache subsystem did not properly handle sequence number overflows, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code. It was discovered that the paravirtualization implementation in the Linux kernel did not properly handle some indirect calls, reducing the effectiveness of Spectre v2 mitigations for paravirtual guests. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-10853, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594, CVE-2018-17182, CVE-2018-6554, CVE-2018-6555
SHA-256 | 5db6c7887e9651017faced7ba733531733f1515003351691c185c6a854134435
Ubuntu Security Notice USN-3776-2
Posted Oct 2, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3776-2 - USN-3776-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Jann Horn discovered that the vmacache subsystem did not properly handle sequence number overflows, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-18216, CVE-2018-10902, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594, CVE-2018-16276, CVE-2018-17182, CVE-2018-6554, CVE-2018-6555
SHA-256 | 3a7694cf511ebdcdcfdc1bb423fdbbd2d78e78e72dc14abdc3a315a6c014c11a
Ubuntu Security Notice USN-3776-1
Posted Oct 2, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3776-1 - Jann Horn discovered that the vmacache subsystem did not properly handle sequence number overflows, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code. It was discovered that the paravirtualization implementation in the Linux kernel did not properly handle some indirect calls, reducing the effectiveness of Spectre v2 mitigations for paravirtual guests. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-18216, CVE-2018-10902, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594, CVE-2018-16276, CVE-2018-17182, CVE-2018-6554, CVE-2018-6555
SHA-256 | 85a539d4dc80cce6215faa6eb351b7170e2643d3239efab5fc20f75531b26f35
Ubuntu Security Notice USN-3775-2
Posted Oct 2, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3775-2 - USN-3775-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 14.04 LTS for Ubuntu 12.04 ESM. It was discovered that the paravirtualization implementation in the Linux kernel did not properly handle some indirect calls, reducing the effectiveness of Spectre v2 mitigations for paravirtual guests. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-14633, CVE-2018-14634, CVE-2018-15572, CVE-2018-15594, CVE-2018-6554, CVE-2018-6555
SHA-256 | 090ca3870bdaa06b0dc62fb8798c12a1ee9c47b196699f9a0203a88188b067b6
Ubuntu Security Notice USN-3775-1
Posted Oct 2, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3775-1 - It was discovered that the paravirtualization implementation in the Linux kernel did not properly handle some indirect calls, reducing the effectiveness of Spectre v2 mitigations for paravirtual guests. A local attacker could use this to expose sensitive information. It was discovered that microprocessors utilizing speculative execution and prediction of return addresses via Return Stack Buffer may allow unauthorized memory reads via sidechannel attacks. An attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-14633, CVE-2018-14634, CVE-2018-15572, CVE-2018-15594, CVE-2018-6554, CVE-2018-6555
SHA-256 | 0671659edb76aef4d781ef70d4b7152b4ea5931d8e8225a5b32f8742a0383ece
Debian Security Advisory 4308-1
Posted Oct 2, 2018
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4308-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, debian
advisories | CVE-2018-10902, CVE-2018-10938, CVE-2018-13099, CVE-2018-14609, CVE-2018-14617, CVE-2018-14633, CVE-2018-14678, CVE-2018-14734, CVE-2018-15572, CVE-2018-15594, CVE-2018-16276, CVE-2018-16658, CVE-2018-17182, CVE-2018-6554, CVE-2018-6555, CVE-2018-7755, CVE-2018-9363, CVE-2018-9516
SHA-256 | a9488a1ec49d402caeb675f06f2c3bfc5c6485d76c3af54ee57d369cf63de403
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