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TI-2019-06465 Aliases CVE-2019-8956GHSA-6647-2gmj-c8h8

Use after free in Linux Kernel

Priority LOW 36CWE-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 3.1 · NVD. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.

Summary

In the Linux Kernel before versions 4.20.8 and 4.19.21 a use-after-free error in the "sctp_sendmsg()" function (net/sctp/socket.c) when handling SCTP_SENDALL flag can be exploited to corrupt memory.

Why it matters now

EPSS 0.01129 66th percentileScored 2026-11-07
Fix Fixed Linux Kernel (UNKNOWN): 4.20.8, 4.19.21

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
UNKNOWNLinux Kernel4.20 to before 4.20.8; 4.19 to before 4.19.214.20.8, 4.19.21Patch availableCNA
  • Linux Kernel VendorUNKNOWN Affected 4.20 to before 4.20.8; 4.19 to before 4.19.21 Fixed in 4.20.8, 4.19.21 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*4.17 to before 4.19.21; 4.20 to before 4.20.8VulnerableLinux
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:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.17 to before 4.19.21; 4.20 to before 4.20.8 Vulnerable ·Linux
  • 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

Remediation

  • Fix · CNA Linux Kernel (UNKNOWN) Fixed in 4.20.8, 4.19.21

Vendor assessments

Red Hat

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

Not affected: 5 products
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise MRG 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-8956
  2. 2026-10-03 Alias added: GHSA-6647-2gmj-c8h8

References

Patch 1

Advisory 5

Other 1

Sources

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