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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

Red Hat Security Advisory 2020-0179-01
Posted Jan 21, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-0179-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include a use-after-free vulnerability.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2018-10853, CVE-2018-18281, CVE-2019-11599
SHA-256 | 0d5a0f10b1f5201a55ee5d74a0dcbb1f48b8429af6b4c428ed98e86453972dae
Red Hat Security Advisory 2020-0103-01
Posted Jan 14, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-0103-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include a use-after-free vulnerability.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2018-10853, CVE-2018-18281, CVE-2018-20856, CVE-2019-11599, CVE-2019-6974
SHA-256 | fcb90197bf847c6ebafd82de864d910086dc1d311169e67eb45ec1ca8f2ab402
Red Hat Security Advisory 2020-0100-01
Posted Jan 14, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-0100-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include a use-after-free vulnerability.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2018-18281, CVE-2018-20856, CVE-2019-11599
SHA-256 | a496efe6c540f0dbcf5379a134ce5b2024588daefb242c5104a38024a949a636
Red Hat Security Advisory 2020-0036-01
Posted Jan 7, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-0036-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include denial of service, null pointer, and use-after-free vulnerabilities.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2017-0861, CVE-2017-10661, CVE-2018-10853, CVE-2018-18281, CVE-2019-11810, CVE-2019-11811
SHA-256 | 1e0f0fd70b306e09392d1b9748151af1a86a0d713f765efd696043bf2e820c1d
Red Hat Security Advisory 2019-2043-01
Posted Aug 6, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-2043-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include buffer overflow, denial of service, information leakage, null pointer, and use-after-free vulnerabilities.

tags | advisory, denial of service, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2018-10853, CVE-2018-13053, CVE-2018-13093, CVE-2018-13094, CVE-2018-13095, CVE-2018-14625, CVE-2018-14734, CVE-2018-15594, CVE-2018-16658, CVE-2018-16885, CVE-2018-18281, CVE-2018-7755, CVE-2018-8087, CVE-2018-9363, CVE-2018-9516, CVE-2018-9517, CVE-2019-11599, CVE-2019-11810, CVE-2019-11833, CVE-2019-3459, CVE-2019-3460, CVE-2019-3882, CVE-2019-3900, CVE-2019-5489, CVE-2019-7222
SHA-256 | e071d742d6603367cb65da2c4efe950228d4321aa8233e8b9ddce2ca45118e06
Red Hat Security Advisory 2019-2029-01
Posted Aug 6, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-2029-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include buffer overflow, denial of service, information leakage, null pointer, and use-after-free vulnerabilities.

tags | advisory, denial of service, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2018-10853, CVE-2018-13053, CVE-2018-13093, CVE-2018-13094, CVE-2018-13095, CVE-2018-14625, CVE-2018-14734, CVE-2018-15594, CVE-2018-16658, CVE-2018-16885, CVE-2018-18281, CVE-2018-7755, CVE-2018-8087, CVE-2018-9363, CVE-2018-9516, CVE-2018-9517, CVE-2019-11599, CVE-2019-11810, CVE-2019-11833, CVE-2019-3459, CVE-2019-3460, CVE-2019-3882, CVE-2019-3900, CVE-2019-5489, CVE-2019-7222
SHA-256 | bac8beb8ce1ab8e43186837924865c4859c9dd53f0986287f9d903fc550005c1
Red Hat Security Advisory 2019-0831-01
Posted Apr 23, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-0831-01 - The kernel-alt packages provide the Linux kernel version 4.x. Issues addressed include bypass, denial of service, null pointer, and use-after-free vulnerabilities.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2018-13053, CVE-2018-13094, CVE-2018-14734, CVE-2018-17972, CVE-2018-18281, CVE-2018-18386, CVE-2018-18397, CVE-2019-9213
SHA-256 | 56ec339fc2da9ed44f9d103367a73097824980f319bfbd006adc8ae2256618d5
Ubuntu Security Notice USN-3871-5
Posted Feb 7, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3871-5 - Wen Xu discovered that a use-after-free vulnerability existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service or possibly execute arbitrary code. Wen Xu discovered that a buffer overflow existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2018-10876, CVE-2018-10877, CVE-2018-10880, CVE-2018-10883, CVE-2018-14625, CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407, CVE-2018-9516
SHA-256 | a5d71e69056829a026e081231955a45dd385e4689768c26f0fa5281f7bb32196
Ubuntu Security Notice USN-3880-2
Posted Feb 5, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3880-2 - USN-3880-1 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 CIFS client implementation in the Linux kernel did not properly handle setup negotiation during session recovery, leading to a NULL pointer exception. An attacker could use this to create a malicious CIFS server that caused a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-1066, CVE-2018-17972, CVE-2018-18281, CVE-2018-9568
SHA-256 | e41eef2f8971b874412e48efd5c8d3f92c9b207977f7cf0a4850da5a80335941
Ubuntu Security Notice USN-3880-1
Posted Feb 5, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3880-1 - It was discovered that the CIFS client implementation in the Linux kernel did not properly handle setup negotiation during session recovery, leading to a NULL pointer exception. An attacker could use this to create a malicious CIFS server that caused a denial of service. 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. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-1066, CVE-2018-17972, CVE-2018-18281, CVE-2018-9568
SHA-256 | eb0ada9fcea297efc352c24bdd5ddeae3d18ba54e2e99898677029db73d54cb5
Ubuntu Security Notice USN-3871-3
Posted Feb 5, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3871-3 - Wen Xu discovered that a use-after-free vulnerability existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service or possibly execute arbitrary code. Wen Xu discovered that a buffer overflow existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2018-10876, CVE-2018-10877, CVE-2018-10880, CVE-2018-10883, CVE-2018-14625, CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407, CVE-2018-9516
SHA-256 | 1041b56c301afb52ce67b7fd6cc20810a44176e8fb1e082b236d07915a47660a
Ubuntu Security Notice USN-3871-4
Posted Feb 5, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3871-4 - USN-3871-1 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. Wen Xu discovered that a use-after-free vulnerability existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-10876, CVE-2018-10877, CVE-2018-10880, CVE-2018-10883, CVE-2018-14625, CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407, CVE-2018-9516
SHA-256 | a11206552fc0cabc9183c5f6c62349248af6aeafede8241f7d11f3a3f97109b7
Ubuntu Security Notice USN-3871-2
Posted Feb 3, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3871-2 - USN-3871-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. Unfortunately, that update introduced regressions with docking station displays and mounting ext4 file systems with the meta_bg option enabled. This update fixes the problems. Various other issues were also addressed.

tags | advisory, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-10877, CVE-2018-10880, CVE-2018-10883, CVE-2018-14625, CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407, CVE-2018-9516
SHA-256 | b3e1923af0fea3e3581de72bb292c33d319b54f08b70c8d14fd63f3ae53a3166
Slackware Security Advisory - Slackware 14.2 kernel Updates
Posted Jan 31, 2019
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New kernel packages are available for Slackware 14.2 to fix security issues.

tags | advisory, kernel
systems | linux, slackware
advisories | CVE-2017-18241, CVE-2017-18249, CVE-2018-10880, CVE-2018-1120, CVE-2018-12896, CVE-2018-13053, CVE-2018-13096, CVE-2018-13097, CVE-2018-13099, CVE-2018-13100, CVE-2018-14610, CVE-2018-14611, CVE-2018-14612, CVE-2018-14613, CVE-2018-14614, CVE-2018-14616, CVE-2018-14633, CVE-2018-16862, CVE-2018-16884, CVE-2018-17972, CVE-2018-18021, CVE-2018-18281, CVE-2018-18690, CVE-2018-18710, CVE-2018-19824, CVE-2018-19985
SHA-256 | b00c9750a9d1a5293cf1b00be4962a74b7a8b39c5ae241b16f2e5d2e209b667b
Ubuntu Security Notice USN-3871-1
Posted Jan 29, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3871-1 - Wen Xu discovered that a use-after-free vulnerability existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service or possibly execute arbitrary code. Wen Xu discovered that a buffer overflow existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2018-10876, CVE-2018-10877, CVE-2018-10880, CVE-2018-10883, CVE-2018-14625, CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407, CVE-2018-9516
SHA-256 | 610a75c7ac7a32b12e02eece3933f2d902097e03a13e3d1b9fd535c83c4f3455
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
SHA-256 | 0d98e117a7daeada246e248b8dd8991176e44f3691e448cdd5919caf358556aa
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
SHA-256 | b57e39d7a6b2621e28ea09c25523ef6ffe045219afabe19ad27f96586c416cd1
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
SHA-256 | 1d7a2b2f17f9389071731196edb3fe5f053e279a8809c199a21352f9cd90b984
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