CVE-2017-7889
HIGH severity · CVSS 7.8 · Incorrect permission assignment
7.8CVSS HIGH
Summary
The mm subsystem in the Linux kernel through 3.2 does not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism, which allows local users to read or write to kernel memory locations in the first megabyte (and bypass slab-allocation access restrictions) via an application that opens the /dev/mem file, related to arch/x86/mm/init.c and drivers/char/mem.c.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a4866aa812518ed1a37d8ea0c881dc946409de94 ↗
Additional information
- NVD record
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a4866aa812518ed1a37d8ea0c881dc946409de94Patch
- http://www.openwall.com/lists/oss-security/2017/04/16/4Patch
- http://www.debian.org/security/2017/dsa-3945Advisory
- http://www.securityfocus.com/bid/97690Advisory
- https://access.redhat.com/errata/RHSA-2017:1842Advisory
- https://access.redhat.com/errata/RHSA-2017:2077Advisory
- https://access.redhat.com/errata/RHSA-2017:2669Advisory
- https://access.redhat.com/errata/RHSA-2018:1854Advisory