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TI-2020-18786 Aliases CVE-2020-36558GHSA-jhg9-9m4g-q544

A race condition in the Linux kernel before 5.5.7 involving VT_RESIZEX could lead to a…

Priority LOW 23CWE-362Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 16 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

A race condition in the Linux kernel before 5.5.7 involving VT_RESIZEX could lead to a NULL pointer dereference and general protection fault.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0031 23rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 5 advisoriesRed Hat: 16 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

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 5.5.7VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 5.5.7 Vulnerable ·Linux

Remediation

Red Hat 5 advisories

  • RHSA-2024:2004 Released 2024-04-23 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1160.118.1.el7, kernel-3.10.0-1160.118.1.el7, kernel-abi-whitelists-3.10.0-1160.118.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.118.1.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.118.1.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1160.118.1.el7, kernel-3.10.0-1160.118.1.el7, kernel-abi-whitelists-3.10.0-1160.118.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1160.118.1.el7, kernel-tools-libs-devel-3.10.0-1160.118.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1160.118.1.el7, kernel-3.10.0-1160.118.1.el7, kernel-abi-whitelists-3.10.0-1160.118.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.118.1.el7
  • RHSA-2024:2003 Released 2024-04-23 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt-3.10.0-1160.118.1.rt56.1269.el7, kernel-rt-debug-3.10.0-1160.118.1.rt56.1269.el7, kernel-rt-debug-devel-3.10.0-1160.118.1.rt56.1269.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1160.118.1.rt56.1269.el7, kernel-rt-debug-3.10.0-1160.118.1.rt56.1269.el7, kernel-rt-debug-devel-3.10.0-1160.118.1.rt56.1269.el7 +7
  • RHSA-2023:5627 Released 2023-10-10 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.8.6) kernel-tools-libs-devel-4.18.0-372.75.1.el8_6
    • Red Hat Enterprise Linux BaseOS EUS (v.8.6) bpftool-4.18.0-372.75.1.el8_6, kernel-4.18.0-372.75.1.el8_6, kernel-abi-stablelists-4.18.0-372.75.1.el8_6 +19
    • Red Hat Virtualization 4 Hypervisor for RHEL 8 kernel-devel-4.18.0-372.75.1.el8_6, perf-4.18.0-372.75.1.el8_6
Show 2 more Red Hat advisories
  • RHSA-2022:7683 Released 2022-11-08 · Red Hat rating Moderate
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-425.3.1.el8
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-425.3.1.el8, kernel-4.18.0-425.3.1.el8, kernel-abi-stablelists-4.18.0-425.3.1.el8 +19
  • RHSA-2022:7444 Released 2022-11-08 · Red Hat rating Moderate
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-425.3.1.rt7.213.el8, kernel-rt-core-4.18.0-425.3.1.rt7.213.el8, kernel-rt-debug-4.18.0-425.3.1.rt7.213.el8 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-425.3.1.rt7.213.el8, kernel-rt-core-4.18.0-425.3.1.rt7.213.el8, kernel-rt-debug-4.18.0-425.3.1.rt7.213.el8 +9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2022:7683
Red Hat CodeReady Linux Builder EUS (v.8.6)Fixed RHSA-2023:5627
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2022:7683
Red Hat Enterprise Linux BaseOS EUS (v.8.6)Fixed RHSA-2023:5627
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2024:2004
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2024:2004
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2024:2004
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2022:7444
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2022:7444
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2024:2004
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2024:2004
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2024:2004
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2024:2004
Red Hat Enterprise Linux for Real Time (v. 7)Fixed RHSA-2024:2003
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2024:2003
Red Hat Virtualization 4 Hypervisor for RHEL 8Fixed RHSA-2023:5627
Not affected: 1 product
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-36558
  2. 2026-10-03 Alias added: GHSA-jhg9-9m4g-q544
  3. 2026-10-08 CISA SSVC decision points changed

References

Exploit 1

Patch 1

  • 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