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CVE-2018-18281

Status Candidate

Overview

Since Linux kernel version 3.2, the mremap() syscall performs TLB flushes after dropping pagetable locks. If a syscall such as ftruncate() removes entries from the pagetables of a task that is in the middle of mremap(), a stale TLB entry can remain for a short time that permits access to a physical page after it has been released back to the page allocator and reused. This is fixed in the following kernel versions: 4.9.135, 4.14.78, 4.18.16, 4.19.

Related Files

Ubuntu Security Notice USN-3835-1
Posted Dec 4, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3835-1 - Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information. Jann Horn discovered that the mremap system call in the Linux kernel did not properly flush the TLB when completing, potentially leaving access to a physical page after it has been released to the page allocator. A local attacker could use this to cause a denial of service , expose sensitive information, or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-17972, CVE-2018-18281, CVE-2018-18445, CVE-2018-18653, CVE-2018-18955, CVE-2018-6559
MD5 | 797f806913c130a0d4051adda370818d
Ubuntu Security Notice USN-3832-1
Posted Nov 30, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3832-1 - Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information. Jann Horn discovered that the mremap system call in the Linux kernel did not properly flush the TLB when completing, potentially leaving access to a physical page after it has been released to the page allocator. A local attacker could use this to cause a denial of service , expose sensitive information, or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-17972, CVE-2018-18281, CVE-2018-18445, CVE-2018-18653, CVE-2018-18955, CVE-2018-6559
MD5 | e6fcaa3ecb5ddac3d3d7836f6838675e
Linux mremap() TLB Flush Too Late
Posted Oct 29, 2018
Authored by Jann Horn, Google Security Research

Linux has an issue where mremap() performs a TLB flush too late with concurrent ftruncate().

tags | exploit
systems | linux
advisories | CVE-2018-18281
MD5 | 662f158d83c31c10c9b25a7d01c09b0a
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