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TI-2018-12094 Aliases CVE-2018-16884GHSA-cxqg-5c27-qx45

Use after free in [UNKNOWN] kernel:

Priority LOW 38CWE-416Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

A flaw was found in the Linux kernel's NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.

Why it matters now

EPSS 0.01455 73rd percentileScored 2026-11-07
Fix Fixed Red Hat: 8 advisories

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
[UNKNOWN]kernel:all versions—No fix listedCNA
  • kernel: Vendor[UNKNOWN] Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*3.7 to before 3.16.65; 3.17 to before 3.18.133; 3.19 to before 4.4.171; 4.5 to before 4.9.151; 4.10 to before 4.14.94; 4.15 to before 4.19.16; 4.20 to before 4.20.3VulnerableLinux
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_mrg:2.0:*:*:*:*:*:*:*2.0VulnerableRed Hat
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
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:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.7 to before 3.16.65; 3.17 to before 3.18.133; 3.19 to before 4.4.171; 4.5 to before 4.9.151; 4.10 to before 4.14.94; 4.15 to before 4.19.16; 4.20 to before 4.20.3 Vulnerable ·Linux
  • cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_mrg:2.0:*:*:*:*:*:*:* Versions 2.0 Vulnerable ·Red Hat
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • 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

Remediation

Red Hat 8 advisories

  • RHSA-2020:2854 Released 2020-07-07 · 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-4.14.0-115.26.1.el7a, kernel-abi-whitelists-4.14.0-115.26.1.el7a, kernel-alt-4.14.0-115.26.1.el7a +8
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) kernel-debug-devel-4.14.0-115.26.1.el7a, kernel-tools-libs-devel-4.14.0-115.26.1.el7a
  • RHSA-2020:0204 Released 2020-01-22 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux BaseOS E4S (v. 8.0) bpftool-4.18.0-80.15.1.el8_0, kernel-4.18.0-80.15.1.el8_0, kernel-abi-whitelists-4.18.0-80.15.1.el8_0 +14
  • RHSA-2019:3517 Released 2019-11-05 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-147.el8
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-147.el8, kernel-4.18.0-147.el8, kernel-abi-whitelists-4.18.0-147.el8 +19
Show 5 more Red Hat advisories
  • RHSA-2019:3309 Released 2019-11-05 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-147.rt24.93.el8, kernel-rt-core-4.18.0-147.rt24.93.el8, kernel-rt-debug-4.18.0-147.rt24.93.el8 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-147.rt24.93.el8, kernel-rt-core-4.18.0-147.rt24.93.el8, kernel-rt-debug-4.18.0-147.rt24.93.el8 +9
  • RHSA-2019:2696 Released 2019-09-12 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux ComputeNode EUS (v. 7.4) kernel-3.10.0-693.58.1.el7, kernel-abi-whitelists-3.10.0-693.58.1.el7, kernel-debug-3.10.0-693.58.1.el7 +7
    • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) kernel-tools-libs-devel-3.10.0-693.58.1.el7
    • Red Hat Enterprise Linux Server EUS (v. 7.4) kernel-3.10.0-693.58.1.el7, kernel-abi-whitelists-3.10.0-693.58.1.el7, kernel-bootwrapper-3.10.0-693.58.1.el7 +10
    • Red Hat Enterprise Linux Server Optional EUS (v. 7.4) kernel-debug-devel-3.10.0-693.58.1.el7, kernel-tools-libs-devel-3.10.0-693.58.1.el7
  • RHSA-2019:2730 Released 2019-09-11 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt-1:3.10.0-693.58.1.rt56.652.el6rt, kernel-rt-debug-1:3.10.0-693.58.1.rt56.652.el6rt, kernel-rt-debug-devel-1:3.10.0-693.58.1.rt56.652.el6rt +7
  • RHSA-2019:1873 Released 2019-07-29 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-957.27.2.el7, kernel-3.10.0-957.27.2.el7, kernel-abi-whitelists-3.10.0-957.27.2.el7 +9
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-957.27.2.el7
    • Red Hat Enterprise Linux ComputeNode (v. 7) bpftool-3.10.0-957.27.2.el7, kernel-3.10.0-957.27.2.el7, kernel-abi-whitelists-3.10.0-957.27.2.el7 +9
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-957.27.2.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-957.27.2.el7, kernel-3.10.0-957.27.2.el7, kernel-abi-whitelists-3.10.0-957.27.2.el7 +12
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-957.27.2.el7, kernel-tools-libs-devel-3.10.0-957.27.2.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-957.27.2.el7, kernel-3.10.0-957.27.2.el7, kernel-abi-whitelists-3.10.0-957.27.2.el7 +9
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-957.27.2.el7
  • RHSA-2019:1891 Released 2019-07-29 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Realtime (v. 7) kernel-rt-3.10.0-957.27.2.rt56.940.el7, kernel-rt-debug-3.10.0-957.27.2.rt56.940.el7, kernel-rt-debug-devel-3.10.0-957.27.2.rt56.940.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-957.27.2.rt56.940.el7, kernel-rt-debug-3.10.0-957.27.2.rt56.940.el7, kernel-rt-debug-devel-3.10.0-957.27.2.rt56.940.el7 +7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2019:3517
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2019:3517
Red Hat Enterprise Linux BaseOS E4S (v. 8.0)Fixed RHSA-2020:0204
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2019:1873
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2019:1873
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2019:1873
Red Hat Enterprise Linux ComputeNode EUS (v. 7.4)Fixed RHSA-2019:2696
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2019:1873
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4)Fixed RHSA-2019:2696
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2019:3309
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2019:3309
Red Hat Enterprise Linux Realtime (v. 7)Fixed RHSA-2019:1891
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2019:1873
Red Hat Enterprise Linux Server EUS (v. 7.4)Fixed RHSA-2019:2696
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2019:1873
Red Hat Enterprise Linux Server Optional EUS (v. 7.4)Fixed RHSA-2019:2696
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2019:1873
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2019:1873
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2020:2854
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)Fixed RHSA-2020:2854
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2019:1891
Red Hat MRG Realtime for RHEL 6 Server v.2Fixed RHSA-2019:2730
Not affected: 3 products
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-16884
  2. 2026-10-03 Alias added: GHSA-cxqg-5c27-qx45

References

Patch 3

Advisory 18

Sources

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