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TI-2021-20573 Aliases CVE-2021-45486GHSA-jr67-68pw-5xqf

In the IPv4 implementation in the Linux kernel before 5.12.4, net/ipv4/route.c has an…

Priority LOW 17CWE-327Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Partial Red Hat: 8 fixed, 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-327.

Summary

In the IPv4 implementation in the Linux kernel before 5.12.4, net/ipv4/route.c has an information leak because the hash table is very small.

Why it matters now

EPSS 0.00399 34th percentileScored 2026-11-07
Fix Partial Red Hat: 4 advisoriesRed Hat: 8 fixed, 2 without a fix

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 · 4

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*before 5.12.4VulnerableLinux
cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:*:*:*:*:*:*:*22.1.3VulnerableOracle
cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:*:*:*:*:*:*:*22.1.1VulnerableOracle
cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:*:*:*:*:*:*:*22.2.0VulnerableOracle
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 5.12.4 Vulnerable ·Linux
  • cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:*:*:*:*:*:*:* Versions 22.1.3 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:*:*:*:*:*:*:* Versions 22.1.1 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:*:*:*:*:*:*:* Versions 22.2.0 Vulnerable ·Oracle

Remediation

Red Hat 4 advisories

  • RHSA-2022:6983 Released 2022-10-18 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS EUS (v.8.4) bpftool-4.18.0-305.65.1.el8_4, kernel-4.18.0-305.65.1.el8_4, kernel-abi-stablelists-4.18.0-305.65.1.el8_4 +19
    • Red Hat Enterprise Linux CRB EUS (v.8.4) kernel-tools-libs-devel-4.18.0-305.65.1.el8_4
  • RHSA-2022:6991 Released 2022-10-18 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux NFV EUS (v.8.4) kernel-rt-4.18.0-305.65.1.rt7.137.el8_4, kernel-rt-core-4.18.0-305.65.1.rt7.137.el8_4, kernel-rt-debug-4.18.0-305.65.1.rt7.137.el8_4 +9
    • Red Hat Enterprise Linux RT EUS (v.8.4) kernel-rt-4.18.0-305.65.1.rt7.137.el8_4, kernel-rt-core-4.18.0-305.65.1.rt7.137.el8_4, kernel-rt-debug-4.18.0-305.65.1.rt7.137.el8_4 +7
  • RHSA-2022:1988 Released 2022-05-10 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-372.9.1.el8, kernel-4.18.0-372.9.1.el8, kernel-abi-stablelists-4.18.0-372.9.1.el8 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-372.9.1.el8
Show 1 more Red Hat advisories
  • RHSA-2022:1975 Released 2022-05-10 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-372.9.1.rt7.166.el8, kernel-rt-core-4.18.0-372.9.1.rt7.166.el8, kernel-rt-debug-4.18.0-372.9.1.rt7.166.el8 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-372.9.1.rt7.166.el8, kernel-rt-core-4.18.0-372.9.1.rt7.166.el8, kernel-rt-debug-4.18.0-372.9.1.rt7.166.el8 +7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2022:1988
Red Hat Enterprise Linux BaseOS EUS (v.8.4)Fixed RHSA-2022:6983
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2022:1988
Red Hat Enterprise Linux CRB EUS (v.8.4)Fixed RHSA-2022:6983
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2022:1975
Red Hat Enterprise Linux NFV EUS (v.8.4)Fixed RHSA-2022:6991
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2022:1975
Red Hat Enterprise Linux RT EUS (v.8.4)Fixed RHSA-2022:6991
Not affected: 1 product
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-45486
  2. 2026-10-03 Alias added: GHSA-jr67-68pw-5xqf

References

Patch 2

Advisory 2

Sources

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