Read the docs
TI-2018-14818 Aliases CVE-2018-20856GHSA-873h-38h4-56jx

An issue was discovered in the Linux kernel before 4.18.7.

Priority LOW 35CWE-416Published · Updated

Key facts

Attack vector
Local
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 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.

Why it matters now

EPSS 0.00707 53rd percentileScored 2026-11-07
Fix Fixed Red Hat: 9 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 · 1

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*before 4.18.7VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 4.18.7 Vulnerable ·Linux

Remediation

Red Hat 9 advisories

  • RHSA-2020:0698 Released 2020-03-03 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server EUS (v. 7.6) kpatch-patch-3_10_0-957_35_1-1-6.el7, kpatch-patch-3_10_0-957_35_2-1-5.el7, kpatch-patch-3_10_0-957_38_1-1-4.el7 +4
  • RHSA-2020:0664 Released 2020-03-03 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) bpftool-3.10.0-957.46.1.el7, kernel-3.10.0-957.46.1.el7, kernel-abi-whitelists-3.10.0-957.46.1.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.46.1.el7
    • Red Hat Enterprise Linux Server EUS (v. 7.6) bpftool-3.10.0-957.46.1.el7, kernel-3.10.0-957.46.1.el7, kernel-abi-whitelists-3.10.0-957.46.1.el7 +11
    • Red Hat Enterprise Linux Server Optional EUS (v. 7.6) kernel-debug-devel-3.10.0-957.46.1.el7, kernel-tools-libs-devel-3.10.0-957.46.1.el7
    • Red Hat Virtualization 4.2 Hypervisor for RHEL 7.6 EUS kernel-devel-3.10.0-957.46.1.el7, perf-3.10.0-957.46.1.el7, python-perf-3.10.0-957.46.1.el7
  • RHSA-2020:0543 Released 2020-02-19 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) kernel-3.10.0-862.48.1.el7, kernel-abi-whitelists-3.10.0-862.48.1.el7, kernel-debug-3.10.0-862.48.1.el7 +7
    • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) kernel-tools-libs-devel-3.10.0-862.48.1.el7
    • Red Hat Enterprise Linux Server EUS (v. 7.5) kernel-3.10.0-862.48.1.el7, kernel-abi-whitelists-3.10.0-862.48.1.el7, kernel-bootwrapper-3.10.0-862.48.1.el7 +10
    • Red Hat Enterprise Linux Server Optional EUS (v. 7.5) kernel-debug-devel-3.10.0-862.48.1.el7, kernel-tools-libs-devel-3.10.0-862.48.1.el7
Show 6 more Red Hat advisories
  • 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
  • RHSA-2019:3217 Released 2019-10-29 · 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-4.14.0-115.14.1.el7a, kernel-abi-whitelists-4.14.0-115.14.1.el7a, kernel-alt-4.14.0-115.14.1.el7a +8
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) kernel-debug-devel-4.14.0-115.14.1.el7a, kernel-tools-libs-devel-4.14.0-115.14.1.el7a
  • RHSA-2019:3089 Released 2019-10-16 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Realtime (v. 7) kernel-rt-3.10.0-1062.4.1.rt56.1027.el7, kernel-rt-debug-3.10.0-1062.4.1.rt56.1027.el7, kernel-rt-debug-devel-3.10.0-1062.4.1.rt56.1027.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1062.4.1.rt56.1027.el7, kernel-rt-debug-3.10.0-1062.4.1.rt56.1027.el7, kernel-rt-debug-devel-3.10.0-1062.4.1.rt56.1027.el7 +7
  • RHSA-2019:3076 Released 2019-10-16 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server (v. 7) kpatch-patch-3_10_0-1062-1-5.el7, kpatch-patch-3_10_0-1062_1_1-1-4.el7, kpatch-patch-3_10_0-1062_1_2-1-3.el7
  • RHSA-2019:3055 Released 2019-10-16 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1062.4.1.el7, kernel-3.10.0-1062.4.1.el7, kernel-abi-whitelists-3.10.0-1062.4.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.4.1.el7
    • Red Hat Enterprise Linux ComputeNode (v. 7) bpftool-3.10.0-1062.4.1.el7, kernel-3.10.0-1062.4.1.el7, kernel-abi-whitelists-3.10.0-1062.4.1.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.4.1.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1062.4.1.el7, kernel-3.10.0-1062.4.1.el7, kernel-abi-whitelists-3.10.0-1062.4.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1062.4.1.el7, kernel-tools-libs-devel-3.10.0-1062.4.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1062.4.1.el7, kernel-3.10.0-1062.4.1.el7, kernel-abi-whitelists-3.10.0-1062.4.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.4.1.el7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2019:3055
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2019:3055
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2019:3055
Red Hat Enterprise Linux ComputeNode EUS (v. 7.5)Fixed RHSA-2020:0543
Red Hat Enterprise Linux ComputeNode EUS (v. 7.6)Fixed RHSA-2020:0664
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2019:3055
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5)Fixed RHSA-2020:0543
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6)Fixed RHSA-2020:0664
Red Hat Enterprise Linux Realtime (v. 7)Fixed RHSA-2019:3089
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2019:3055, RHSA-2019:3076
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-2020:0543
Red Hat Enterprise Linux Server EUS (v. 7.6)Fixed RHSA-2020:0664, RHSA-2020:0698
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2019:3055
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-2020:0543
Red Hat Enterprise Linux Server Optional EUS (v. 7.6)Fixed RHSA-2020:0664
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-2019:3055
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2019:3055
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2019:3217
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)Fixed RHSA-2019:3217
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2019:3089
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-2020:0664
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-2018-20856
  2. 2026-10-03 Alias added: GHSA-873h-38h4-56jx

References

Patch 2

Advisory 14

Other 8

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

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