Vulnerability Details : 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.
Products affected by CVE-2018-18281
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-18281
0.11%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 44 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-18281
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.6
|
MEDIUM | AV:L/AC:L/Au:N/C:P/I:P/A:P |
3.9
|
6.4
|
NIST | |
|
7.8
|
HIGH | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2018-18281
-
The product does not properly "clean up" and remove temporary or supporting resources after they have been used.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-18281
-
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.16
Patch;Vendor Advisory
-
https://lists.debian.org/debian-lts-announce/2019/03/msg00017.html
[SECURITY] [DLA 1715-1] linux-4.9 security updateMailing List;Third Party Advisory
-
http://www.securityfocus.com/bid/106503
Linux Kernel Components Multiple Security VulnerabilitiesThird Party Advisory;VDB Entry
-
https://bugs.chromium.org/p/project-zero/issues/detail?id=1695
1695 - Linux: mremap() TLB flush too late with concurrent ftruncate() - project-zero - MonorailExploit;Patch;Third Party Advisory
-
https://access.redhat.com/errata/RHSA-2020:0036
RHSA-2020:0036 - Security Advisory - Red Hat Customer Portal
-
https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
[SECURITY] [DLA 1731-2] linux regression updateMailing List;Third Party Advisory
-
https://usn.ubuntu.com/3871-3/
USN-3871-3: Linux kernel (AWS, GCP, KVM, OEM, Raspberry Pi 2) vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://access.redhat.com/errata/RHSA-2020:0100
RHSA-2020:0100 - Security Advisory - Red Hat Customer Portal
-
https://usn.ubuntu.com/3835-1/
USN-3835-1: Linux kernel vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.135
Patch;Vendor Advisory
-
https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
[SECURITY] [DLA 1731-1] linux security updateMailing List;Third Party Advisory
-
http://www.securityfocus.com/bid/105761
Linux Kernel CVE-2018-18281 Local Security Bypass VulnerabilityThird Party Advisory;VDB Entry
-
http://www.openwall.com/lists/oss-security/2018/10/29/5
oss-security - Linux kernel: TLB flush happens too late on mremap (CVE-2018-18281; fixed in 4.9.135, 4.14.78, 4.18.16, 4.19)Mailing List;Patch;Third Party Advisory
-
https://usn.ubuntu.com/3880-1/
USN-3880-1: Linux kernel vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://usn.ubuntu.com/3871-1/
USN-3871-1: Linux kernel vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eb66ae030829605d61fbef1909ce310e29f78821
kernel/git/torvalds/linux.git - Linux kernel source treePatch;Vendor Advisory
-
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.78
Patch;Vendor Advisory
-
https://usn.ubuntu.com/3871-4/
USN-3871-4: Linux kernel (HWE) vulnerabilities | Ubuntu security noticesThird Party Advisory
-
http://packetstormsecurity.com/files/150001/Linux-mremap-TLB-Flush-Too-Late.html
Linux mremap() TLB Flush Too Late ≈ Packet StormPatch;Third Party Advisory;VDB Entry
-
https://usn.ubuntu.com/3880-2/
USN-3880-2: Linux kernel (Trusty HWE) vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://access.redhat.com/errata/RHSA-2019:2029
RHSA-2019:2029 - Security Advisory - Red Hat Customer Portal
-
https://access.redhat.com/errata/RHSA-2020:0179
RHSA-2020:0179 - Security Advisory - Red Hat Customer Portal
-
https://usn.ubuntu.com/3832-1/
USN-3832-1: Linux kernel (AWS) vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://access.redhat.com/errata/RHSA-2019:0831
RHSA-2019:0831 - Security Advisory - Red Hat Customer Portal
-
https://access.redhat.com/errata/RHSA-2020:0103
RHSA-2020:0103 - Security Advisory - Red Hat Customer Portal
-
https://access.redhat.com/errata/RHSA-2019:2043
RHSA-2019:2043 - Security Advisory - Red Hat Customer Portal
-
https://usn.ubuntu.com/3871-5/
USN-3871-5: Linux kernel (Azure) vulnerabilities | Ubuntu security noticesThird Party Advisory
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