Vulnerability in Linux Kernel
CVE-2018-18281
Since Linux kernel version 3.2, the mremap() syscall performs TLB flushes after dropping pagetable locks. If a syscall such as ftruncate() removes entries from the pagetables of a task that is in the middle of mremap(), a stale TLB entry can remain for a short time that permits access to a physical page after it has been released back to the page allocator and reused. This is fixed in the following kernel versions: 4.9.135, 4.14.78, 4.18.16, 4.19.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (63.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Linux Kernel
- Canonical Ubuntu Linux — versions 12.04, 14.04, 16.04
- Debian Linux — versions 8.0
Weakness classification (CWE)
Public proof-of-concept exploits
- ARPSyndicate/cvemon
- jiayy/android_
- kdn111/linux-kernel-exploitation
- khanhdn111/linux-kernel-exploitation
- khanhdz-06/linux-kernel-exploitation
- khanhdz191/linux-kernel-exploitation
- khanhhdz/linux-kernel-exploitation
- khanhhdz06/linux-kernel-exploitation
- khanhnd123/linux-kernel-exploitation
- khnhdz/linux-kernel-exploitation
References
- packetstormsecurity.com/files/150001/Linux-mremap-TLB-Flush-Too-Late.html (Patch, VDB Entry, Third Party Advisory)
- usn.ubuntu.com/3835-1/ (vendor-advisory, Third Party Advisory)
- cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.16 (Patch, Vendor Advisory)
- usn.ubuntu.com/3880-1/ (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3871-5/ (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3871-4/ (vendor-advisory, Third Party Advisory)
- www.openwall.com/lists/oss-security/2018/10/29/5 (mailing-list, Patch, Mailing List, Third Party Advisory)
- usn.ubuntu.com/3880-2/ (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3832-1/ (vendor-advisory, Third Party Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2018-18281?
- CVE-2018-18281 is a high-severity vulnerability in Linux Kernel, classified under Incomplete Cleanup. CVSS score: 7.8/10. Published 2018-10-30.
- How severe is CVE-2018-18281?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2018-18281 known to be exploited?
- 16 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.