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CVE-2018-18397

Status Candidate

Overview

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs file (if the user has read-only access to that file, and that file contains holes), related to fs/userfaultfd.c and mm/userfaultfd.c.

Related Files

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-3903-2
Posted Mar 6, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3903-2 - USN-3903-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.10. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 18.10 for Ubuntu 18.04 LTS. Jason Wang discovered that the vhost net driver in the Linux kernel contained an out of bounds write vulnerability. An attacker in a guest virtual machine could use this to cause a denial of service or possibly execute arbitrary code in the host kernel. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-16880, CVE-2018-18397, CVE-2019-6133
SHA-256 | afcaa009d7d28d01ca610ca75faf61e90bc402ea1bad246d79cf7dca496c6849
Ubuntu Security Notice USN-3903-1
Posted Mar 6, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3903-1 - Jason Wang discovered that the vhost net driver in the Linux kernel contained an out of bounds write vulnerability. An attacker in a guest virtual machine could use this to cause a denial of service or possibly execute arbitrary code in the host kernel. Jann Horn discovered that the userfaultd implementation in the Linux kernel did not properly restrict access to certain ioctls. A local attacker could use this possibly to modify files. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-16880, CVE-2018-18397, CVE-2019-6133
SHA-256 | 73c11215ef38f1741368473e63e13f27c7a6aeadf7ef9a8536e6a489ec56ddf7
Ubuntu Security Notice USN-3901-2
Posted Mar 6, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3901-2 - USN-3901-1 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 userfaultd implementation in the Linux kernel did not properly restrict access to certain ioctls. A local attacker could use this possibly to modify files. Various other issues were also addressed.

tags | advisory, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-18397, CVE-2018-19854, CVE-2019-6133
SHA-256 | c25a324edcfdb0698186cf0255921ec343ba3bedda004de93b2622c9d0166073
Ubuntu Security Notice USN-3901-1
Posted Mar 6, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3901-1 - Jann Horn discovered that the userfaultd implementation in the Linux kernel did not properly restrict access to certain ioctls. A local attacker could use this possibly to modify files. It was discovered that the crypto subsystem of the Linux kernel leaked uninitialized memory to user space in some situations. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel, local, crypto
systems | linux, ubuntu
advisories | CVE-2018-18397, CVE-2018-19854, CVE-2019-6133
SHA-256 | 2733d1718525888590b59662b23b1cc1de9b8d11aba8290d25b543ffd636e966
Red Hat Security Advisory 2019-0324-01
Posted Feb 12, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-0324-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include a bypass vulnerability.

tags | advisory, kernel, bypass
systems | linux, redhat
advisories | CVE-2018-18397
SHA-256 | eb4166c50e12a48a55f375462457cc665acf1c2f7589037a65eb5ae947f94e0c
Red Hat Security Advisory 2019-0163-01
Posted Jan 29, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-0163-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include bypass and use-after-free vulnerabilities.

tags | advisory, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2018-18397, CVE-2018-18559
SHA-256 | 67bea05cdf56e6c44d7f698e4059a01ff4fe8c273c037c1f15ba734adc98234f
Red Hat Security Advisory 2019-0202-01
Posted Jan 29, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-0202-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include a bypass vulnerability.

tags | advisory, kernel, bypass
systems | linux, redhat
advisories | CVE-2018-18397
SHA-256 | e466d9e8d46a7fbdf7a04ff70339a8429fecbdce61463fd8ca56e052605ddbd5
Linux userfaultfd tmpfs File Permission Bypass
Posted Dec 12, 2018
Authored by Jann Horn, Google Security Research

Linux userfaultfd bypasses tmpfs file permissions.

tags | exploit
systems | linux
advisories | CVE-2018-18397
SHA-256 | 1b8d3ce7875318cd21ad32bec57be7ed660168064accdd2e8a8b60fc13d6aadf
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