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CVE-2014-7975

Status Candidate

Overview

The do_umount function in fs/namespace.c in the Linux kernel through 3.17 does not require the CAP_SYS_ADMIN capability for do_remount_sb calls that change the root filesystem to read-only, which allows local users to cause a denial of service (loss of writability) by making certain unshare system calls, clearing the / MNT_LOCKED flag, and making an MNT_FORCE umount system call.

Related Files

Red Hat Security Advisory 2017-1842-01
Posted Aug 2, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-1842-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: An use-after-free flaw was found in the Linux kernel which enables a race condition in the L2TPv3 IP Encapsulation feature. A local user could use this flaw to escalate their privileges or crash the system. A flaw was found that can be triggered in keyring_search_iterator in keyring.c if type->match is NULL. A local user could use this flaw to crash the system or, potentially, escalate their privileges.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2014-7970, CVE-2014-7975, CVE-2015-8839, CVE-2015-8970, CVE-2016-10088, CVE-2016-10147, CVE-2016-10200, CVE-2016-6213, CVE-2016-7042, CVE-2016-7097, CVE-2016-8645, CVE-2016-9576, CVE-2016-9588, CVE-2016-9604, CVE-2016-9685, CVE-2016-9806, CVE-2017-2596, CVE-2017-2647, CVE-2017-2671, CVE-2017-5970, CVE-2017-6001, CVE-2017-6951, CVE-2017-7187, CVE-2017-7616, CVE-2017-7889, CVE-2017-8797, CVE-2017-8890, CVE-2017-9074
MD5 | e79dcd340ec8fd5ccd78d062d54ebf21
Red Hat Security Advisory 2017-2077-01
Posted Aug 2, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-2077-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix: An use-after-free flaw was found in the Linux kernel which enables a race condition in the L2TPv3 IP Encapsulation feature. A local user could use this flaw to escalate their privileges or crash the system. A flaw was found that can be triggered in keyring_search_iterator in keyring.c if type->match is NULL. A local user could use this flaw to crash the system or, potentially, escalate their privileges.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2014-7970, CVE-2014-7975, CVE-2015-8839, CVE-2015-8970, CVE-2016-10088, CVE-2016-10147, CVE-2016-10200, CVE-2016-6213, CVE-2016-7042, CVE-2016-7097, CVE-2016-8645, CVE-2016-9576, CVE-2016-9588, CVE-2016-9604, CVE-2016-9685, CVE-2016-9806, CVE-2017-2596, CVE-2017-2647, CVE-2017-2671, CVE-2017-5970, CVE-2017-6001, CVE-2017-6951, CVE-2017-7187, CVE-2017-7616, CVE-2017-7889, CVE-2017-8797, CVE-2017-8890, CVE-2017-9074
MD5 | 06777be13da445d34278d3bd85082db2
Ubuntu Security Notice USN-2417-1
Posted Nov 25, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2417-1 - Nadav Amit reported that the KVM (Kernel Virtual Machine) mishandles noncanonical addresses when emulating instructions that change the rip (Instruction Pointer). A guest user with access to I/O or the MMIO can use this flaw to cause a denial of service (system crash) of the guest. A flaw was discovered with the handling of the invept instruction in the KVM (Kernel Virtual Machine) subsystem of the Linux kernel. An unprivileged guest user could exploit this flaw to cause a denial of service (system crash) on the guest. Various other issues were also addressed.

tags | advisory, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2014-3610, CVE-2014-3611, CVE-2014-3645, CVE-2014-3646, CVE-2014-3647, CVE-2014-3673, CVE-2014-3687, CVE-2014-3688, CVE-2014-3690, CVE-2014-4608, CVE-2014-7207, CVE-2014-7975
MD5 | 6f1c9e48ea0ccea9a6821a3a605b325d
Ubuntu Security Notice USN-2421-1
Posted Nov 25, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2421-1 - A flaw was discovered in how the Linux kernel's KVM (Kernel Virtual Machine) subsystem handles the CR4 control register at VM entry on Intel processors. A local host OS user can exploit this to cause a denial of service (kill arbitrary processes, or system disruption) by leveraging /dev/kvm access. Don Bailey discovered a flaw in the LZO decompress algorithm used by the Linux kernel. An attacker could exploit this flaw to cause a denial of service (memory corruption or OOPS). Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2014-3690, CVE-2014-4608, CVE-2014-7975
MD5 | a595502f70f0db3cc13d0091262f4279
Ubuntu Security Notice USN-2420-1
Posted Nov 25, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2420-1 - A flaw was discovered in how the Linux kernel's KVM (Kernel Virtual Machine) subsystem handles the CR4 control register at VM entry on Intel processors. A local host OS user can exploit this to cause a denial of service (kill arbitrary processes, or system disruption) by leveraging /dev/kvm access. Don Bailey discovered a flaw in the LZO decompress algorithm used by the Linux kernel. An attacker could exploit this flaw to cause a denial of service (memory corruption or OOPS). Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2014-3690, CVE-2014-4608, CVE-2014-7970, CVE-2014-7975
MD5 | 77924cd0bf14e0bc879795779579ba2d
Ubuntu Security Notice USN-2419-1
Posted Nov 25, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2419-1 - A flaw was discovered in how the Linux kernel's KVM (Kernel Virtual Machine) subsystem handles the CR4 control register at VM entry on Intel processors. A local host OS user can exploit this to cause a denial of service (kill arbitrary processes, or system disruption) by leveraging /dev/kvm access. Don Bailey discovered a flaw in the LZO decompress algorithm used by the Linux kernel. An attacker could exploit this flaw to cause a denial of service (memory corruption or OOPS). Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2014-3690, CVE-2014-4608, CVE-2014-7970, CVE-2014-7975
MD5 | 27a784d3d15fc18622956bb427a27c95
Ubuntu Security Notice USN-2416-1
Posted Nov 25, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2416-1 - Don Bailey discovered a flaw in the LZO decompress algorithm used by the Linux kernel. An attacker could exploit this flaw to cause a denial of service (memory corruption or OOPS). Andy Lutomirski discovered that the Linux kernel was not checking the CAP_SYS_ADMIN when remounting filesystems to read-only. A local user could exploit this flaw to cause a denial of service (loss of writability). Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2014-4608, CVE-2014-7975
MD5 | 3687fcfbab52991da34666dcc1f4cefc
Ubuntu Security Notice USN-2418-1
Posted Nov 25, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2418-1 - Nadav Amit reported that the KVM (Kernel Virtual Machine) mishandles noncanonical addresses when emulating instructions that change the rip (Instruction Pointer). A guest user with access to I/O or the MMIO can use this flaw to cause a denial of service (system crash) of the guest. A flaw was discovered with the handling of the invept instruction in the KVM (Kernel Virtual Machine) subsystem of the Linux kernel. An unprivileged guest user could exploit this flaw to cause a denial of service (system crash) on the guest. Various other issues were also addressed.

tags | advisory, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2014-3610, CVE-2014-3611, CVE-2014-3645, CVE-2014-3646, CVE-2014-3647, CVE-2014-3673, CVE-2014-3687, CVE-2014-3688, CVE-2014-3690, CVE-2014-4608, CVE-2014-7207, CVE-2014-7975
MD5 | 10c2c1fc3789621dbb081c9a2a1c8156
Ubuntu Security Notice USN-2415-1
Posted Nov 24, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2415-1 - Andy Lutomirski discovered that the Linux kernel was not checking the CAP_SYS_ADMIN when remounting filesystems to read-only. A local user could exploit this flaw to cause a denial of service (loss of writability).

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2014-7975
MD5 | ecd80db567739de51671dc392f7ba458
Mandriva Linux Security Advisory 2014-201
Posted Oct 21, 2014
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory 2014-201 - Multiple vulnerabilities has been found and corrected in the Linux kernel. These include stack-based buffer overflows and denial of service issues.

tags | advisory, denial of service, overflow, kernel, vulnerability
systems | linux, mandriva
advisories | CVE-2014-3122, CVE-2014-3181, CVE-2014-3182, CVE-2014-3184, CVE-2014-3185, CVE-2014-3186, CVE-2014-3534, CVE-2014-3601, CVE-2014-5077, CVE-2014-5206, CVE-2014-5471, CVE-2014-5472, CVE-2014-6410, CVE-2014-7975
MD5 | e2c8be1ff54f319695bb141c8d45d659
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