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TI-2018-12916 Aliases CVE-2018-18281GHSA-gffw-ppmc-p7r6

Since Linux kernel version 3.2, the mremap() syscall performs TLB flushes after dropping…

Priority LOW 36CWE-459Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

EPSS 0.01104 65th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 7 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*3.2 to before 4.9.135; 4.9.136 to before 4.14.78; 4.14.79 to before 4.18.16; 4.18.17 to before 4.19VulnerableLinux
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*12.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*18.10VulnerableCanonical
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.2 to before 4.9.135; 4.9.136 to before 4.14.78; 4.14.79 to before 4.18.16; 4.18.17 to before 4.19 Vulnerable ·Linux
  • cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:* Versions 12.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* Versions 18.10 Vulnerable ·Canonical
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian

Remediation

Red Hat 7 advisories

  • RHSA-2020:0179 Released 2020-01-21 · Red Hat rating Moderate
    kernel security and bug fix update
    • Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) bpftool-3.10.0-957.43.1.el7, kernel-3.10.0-957.43.1.el7, kernel-abi-whitelists-3.10.0-957.43.1.el7 +9
    • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.43.1.el7
    • Red Hat Enterprise Linux Server EUS (v. 7.6) bpftool-3.10.0-957.43.1.el7, kernel-3.10.0-957.43.1.el7, kernel-abi-whitelists-3.10.0-957.43.1.el7 +12
    • Red Hat Enterprise Linux Server Optional EUS (v. 7.6) kernel-debug-devel-3.10.0-957.43.1.el7, kernel-tools-libs-devel-3.10.0-957.43.1.el7
    • Red Hat Virtualization 4.2 Hypervisor for RHEL 7.6 EUS kernel-devel-3.10.0-957.43.1.el7, kernel-headers-3.10.0-957.43.1.el7, perf-3.10.0-957.43.1.el7 +1
  • RHSA-2020:0103 Released 2020-01-14 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.4) kernel-3.10.0-693.62.1.el7, kernel-abi-whitelists-3.10.0-693.62.1.el7, kernel-debug-3.10.0-693.62.1.el7 +7
    • Red Hat Enterprise Linux Server E4S (v. 7.4) kernel-3.10.0-693.62.1.el7, kernel-abi-whitelists-3.10.0-693.62.1.el7, kernel-bootwrapper-3.10.0-693.62.1.el7 +8
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) kernel-tools-libs-devel-3.10.0-693.62.1.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.4) kernel-debug-devel-3.10.0-693.62.1.el7, kernel-tools-libs-devel-3.10.0-693.62.1.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.4) kernel-tools-libs-devel-3.10.0-693.62.1.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.4) kernel-3.10.0-693.62.1.el7, kernel-abi-whitelists-3.10.0-693.62.1.el7, kernel-debug-3.10.0-693.62.1.el7 +7
  • RHSA-2020:0100 Released 2020-01-14 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt-1:3.10.0-693.62.1.rt56.659.el6rt, kernel-rt-debug-1:3.10.0-693.62.1.rt56.659.el6rt, kernel-rt-debug-devel-1:3.10.0-693.62.1.rt56.659.el6rt +7
Show 4 more Red Hat advisories
  • RHSA-2020:0036 Released 2020-01-07 · Red Hat rating Moderate
    kernel security and bug fix update
    • Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) kernel-3.10.0-862.46.1.el7, kernel-abi-whitelists-3.10.0-862.46.1.el7, kernel-debug-3.10.0-862.46.1.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) kernel-tools-libs-devel-3.10.0-862.46.1.el7
    • Red Hat Enterprise Linux Server EUS (v. 7.5) kernel-3.10.0-862.46.1.el7, kernel-abi-whitelists-3.10.0-862.46.1.el7, kernel-bootwrapper-3.10.0-862.46.1.el7 +11
    • Red Hat Enterprise Linux Server Optional EUS (v. 7.5) kernel-debug-devel-3.10.0-862.46.1.el7, kernel-tools-libs-devel-3.10.0-862.46.1.el7
  • RHSA-2019:2043 Released 2019-08-07 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt-3.10.0-1062.rt56.1022.el7, kernel-rt-debug-3.10.0-1062.rt56.1022.el7, kernel-rt-debug-devel-3.10.0-1062.rt56.1022.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1062.rt56.1022.el7, kernel-rt-debug-3.10.0-1062.rt56.1022.el7, kernel-rt-debug-devel-3.10.0-1062.rt56.1022.el7 +7
  • RHSA-2019:2029 Released 2019-08-06 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1062.el7, kernel-3.10.0-1062.el7, kernel-abi-whitelists-3.10.0-1062.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.el7
    • Red Hat Enterprise Linux ComputeNode (v. 7) bpftool-3.10.0-1062.el7, kernel-3.10.0-1062.el7, kernel-abi-whitelists-3.10.0-1062.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1062.el7, kernel-3.10.0-1062.el7, kernel-abi-whitelists-3.10.0-1062.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1062.el7, kernel-tools-libs-devel-3.10.0-1062.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1062.el7, kernel-3.10.0-1062.el7, kernel-abi-whitelists-3.10.0-1062.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.el7
  • RHSA-2019:0831 Released 2019-04-23 · Red Hat rating Important
    kernel-alt security and bug fix update
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) kernel-4.14.0-115.7.1.el7a, kernel-abi-whitelists-4.14.0-115.7.1.el7a, kernel-alt-4.14.0-115.7.1.el7a +9
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) kernel-debug-devel-4.14.0-115.7.1.el7a, kernel-tools-libs-devel-4.14.0-115.7.1.el7a

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2019:2029
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2019:2029
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2019:2029
Red Hat Enterprise Linux ComputeNode EUS (v. 7.5)Fixed RHSA-2020:0036
Red Hat Enterprise Linux ComputeNode EUS (v. 7.6)Fixed RHSA-2020:0179
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2019:2029
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5)Fixed RHSA-2020:0036
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6)Fixed RHSA-2020:0179
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2019:2029
Red Hat Enterprise Linux Server AUS (v. 7.4)Fixed RHSA-2020:0103
Red Hat Enterprise Linux Server E4S (v. 7.4)Fixed RHSA-2020:0103
Red Hat Enterprise Linux Server EUS (v. 7.5)Fixed RHSA-2020:0036
Red Hat Enterprise Linux Server EUS (v. 7.6)Fixed RHSA-2020:0179
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2019:2029
Red Hat Enterprise Linux Server Optional AUS (v. 7.4)Fixed RHSA-2020:0103
Red Hat Enterprise Linux Server Optional E4S (v. 7.4)Fixed RHSA-2020:0103
Red Hat Enterprise Linux Server Optional EUS (v. 7.5)Fixed RHSA-2020:0036
Red Hat Enterprise Linux Server Optional EUS (v. 7.6)Fixed RHSA-2020:0179
Red Hat Enterprise Linux Server Optional TUS (v. 7.4)Fixed RHSA-2020:0103
Red Hat Enterprise Linux Server TUS (v. 7.4)Fixed RHSA-2020:0103
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2019:2029
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2019:2029
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2019:0831
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)Fixed RHSA-2019:0831
Red Hat Enterprise Linux for Real Time (v. 7)Fixed RHSA-2019:2043
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2019:2043
Red Hat MRG Realtime for RHEL 6 Server v.2Fixed RHSA-2020:0100
Red Hat Virtualization 4.2 Hypervisor for RHEL 7.6 EUSFixed RHSA-2020:0179
Not affected: 3 products
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-18281
  2. 2026-10-03 Alias added: GHSA-gffw-ppmc-p7r6

References

Exploit 1

Patch 6

Advisory 18

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences