Resource management error in Linux kernel - CVE-2019-11487

Vulnerability identifier: #VU21057

CSH Severity: Low

CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-11487

CWE-ID: CWE-399

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a reference count overflow in page->_refcount that leads to a use-after-free error on systems with more than 140 GiB of RAM. A local user can send specially crafted FUSE requests that may lead to denial of service conditions.

The vulnerability is related to code in fs/fuse/dev.c, fs/pipe.c, fs/splice.c, include/linux/mm.h, include/linux/pipe_fs_i.h, kernel/trace/trace.c, mm/gup.c, and mm/hugetlb.c files.

Linux kernel
CentOS
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Slackware Linux
MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
linux-4.4.217/kernel-generic
linux-4.4.217/kernel-huge
linux-4.4.217/kernel-modules
linux-4.4.217/kernel-headers
kernel-alt (Red Hat package)
Red Hat Virtualization Host

Install updates from vendor's website.

Linux kernel - update to 5.1 rc5
kernel (Red Hat package) - addressed in versions 2.6.32-754.35.1.el6, 3.10.0-693.71.2.el7, 3.10.0-957.56.1.el7, 3.10.0-1062.18.1.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-693.71.2.rt56.670.el6rt, 3.10.0-1062.18.1.rt56.1044.el7
linux-4.4.217/kernel-generic - update to 4.4.217
linux-4.4.217/kernel-huge - update to 4.4.217
linux-4.4.217/kernel-modules - update to 4.4.217
linux-4.4.217/kernel-headers - update to 4.4.217_smp
kernel-alt (Red Hat package) - update to 4.14.0-115.17.1.el7a

• http://www.openwall.com/lists/oss-security/2019/04/29/1
• http://www.securityfocus.com/bid/108054
• https://bugs.chromium.org/p/project-zero/issues/detail?id=1752
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=15fab63e1e57be9fdb5eec1bbc5916e9825e9acb
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6b3a707736301c2128ca85ce85fb13f60b5e350a
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=88b1a17dfc3ed7728316478fae0f5ad508f50397
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8fde12ca79aff9b5ba951fce1a2641901b8d8e64
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f958d7b528b1b40c44cfda5eabe2d82760d868c3
• https://github.com/torvalds/linux/commit/15fab63e1e57be9fdb5eec1bbc5916e9825e9acb
• https://github.com/torvalds/linux/commit/6b3a707736301c2128ca85ce85fb13f60b5e350a
• https://github.com/torvalds/linux/commit/88b1a17dfc3ed7728316478fae0f5ad508f50397
• https://github.com/torvalds/linux/commit/8fde12ca79aff9b5ba951fce1a2641901b8d8e64
• https://github.com/torvalds/linux/commit/f958d7b528b1b40c44cfda5eabe2d82760d868c3
• https://lwn.net/Articles/786044/
• https://security.netapp.com/advisory/ntap-20190517-0005/

• CentOS 7 update for kernel
• Red Hat Enterprise Linux 7 update for kernel
• Red Hat Enterprise MRG 2 update for kernel-rt
• Red Hat Enterprise Linux 6 update for kernel
• CentOS 6 update for kernel
• Red Hat Enterprise Linux 7 update for kernel-alt
• Red Hat Enterprise Linux 7 update for kernel
• Red Hat Enterprise Linux 7 update for kernel-rt
• Red Hat Enterprise Linux 7.6 Extended Update Support update for kernel
• Slackware Linux update for kernel