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CVE-2020-8428

Status Candidate

Overview

fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed.

Related Files

Kernel Live Patch Security Notice LSN-0065-1
Posted Apr 15, 2020
Authored by Benjamin M. Romer

Andrew Honig reported a flaw in the way KVM (Kernel-based Virtual Machine) emulated the IOAPIC. A privileged guest user could exploit this flaw to read host memory or cause a denial of service (crash the host). It was discovered that the KVM implementation in the Linux kernel, when paravirtual TLB flushes are enabled in guests, the hypervisor in some situations could miss deferred TLB flushes or otherwise mishandle them. An attacker in a guest VM could use this to expose sensitive information (read memory from another guest VM). Al Viro discovered that the vfs layer in the Linux kernel contained a use- after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory).

tags | advisory, denial of service, kernel, local
systems | linux
advisories | CVE-2013-1798, CVE-2019-3016, CVE-2020-8428
MD5 | 447f0d1c5c178b42193ae361cc92d87a
Ubuntu Security Notice USN-4324-1
Posted Apr 8, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4324-1 - Al Viro discovered that the vfs layer in the Linux kernel contained a use- after-free vulnerability. A local attacker could use this to cause a denial of service or possibly expose sensitive information. Shijie Luo discovered that the ext4 file system implementation in the Linux kernel did not properly check for a too-large journal size. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-8428, CVE-2020-8992
MD5 | 88d73091ebcf4e60991cee1fc019b40c
Ubuntu Security Notice USN-4325-1
Posted Apr 8, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4325-1 - It was discovered that the IPMI message handler implementation in the Linux kernel did not properly deallocate memory in certain situations. A local attacker could use this to cause a denial of service. Al Viro discovered that the vfs layer in the Linux kernel contained a use- after-free vulnerability. A local attacker could use this to cause a denial of service or possibly expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-19046, CVE-2020-8428
MD5 | 8e7cf92f6046fc3324ecb278adef7635
Ubuntu Security Notice USN-4320-1
Posted Apr 7, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4320-1 - Al Viro discovered that the vfs layer in the Linux kernel contained a use- after-free vulnerability. A local attacker could use this to cause a denial of service or possibly expose sensitive information.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-8428
MD5 | 6ea0c25e0c931ab10cfe09aaa1e5118a
Ubuntu Security Notice USN-4318-1
Posted Apr 7, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4318-1 - Al Viro discovered that the vfs layer in the Linux kernel contained a use- after-free vulnerability. A local attacker could use this to cause a denial of service or possibly expose sensitive information. Gustavo Romero and Paul Mackerras discovered that the KVM implementation in the Linux kernel for PowerPC processors did not properly keep guest state separate from host state. A local attacker in a KVM guest could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-8428, CVE-2020-8834, CVE-2020-8992
MD5 | 5e48818ed2a36a0661bea51765c36cec
Ubuntu Security Notice USN-4319-1
Posted Apr 7, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4319-1 - It was discovered that the IPMI message handler implementation in the Linux kernel did not properly deallocate memory in certain situations. A local attacker could use this to cause a denial of service. Al Viro discovered that the vfs layer in the Linux kernel contained a use- after-free vulnerability. A local attacker could use this to cause a denial of service or possibly expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-19046, CVE-2020-8428
MD5 | 1d7e5f8103eb7b56ba23c318a412eed7
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