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Advisory severityCritical9.0Vendor: HighRed Hat Linux

Critical [CVE-2026-4408] Remote Code Execution in SAMR

This critical-severity Red Hat Linux advisory covers CVE-2026-4408 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-4408 Source published

VulniPulse record published

CVE-2026-4408
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

Remote Code Execution in SAMR. Red Hat rates this important (CVSS 9).

Weakness: CWE-78. Affected package(s): samba, rhcos.

Resolved in Red Hat advisory RHSA-2026:29863 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; and 18 more.

Is CVE-2026-4408 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-4408 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-4408?

Upgrade to a fixed release named by Red Hat:

  • RHSA-2026:29863

Confirm against the vendor advisory before you patch.

Affected versions
  • samba-0:4.13.3-12.el8_4.1
  • samba-0:4.19.4-16.el8_10
  • samba-0:4.23.5-10.el9_8
  • rhcos-4.20.9.6.202606241928-0
  • samba-0:4.21.3-114.el10_0.1
  • samba-0:4.15.5-16.el8_6.1
  • samba-0:4.23.5-109.el10_2
  • samba-0:4.17.5-7.el8_8.1
  • samba-0:4.21.3-14.el9_6.1
  • samba-0:4.10.16-26.el7_9.1
  • samba-0:4.19.4-105.el9_4.4
  • rhcos-4.19.9.6.202606241344-0

Official advisory · high-confidence parse· fetched 4 months ago·verify at source

Fixed versions
  • RHSA-2026:29863

Official advisory · high-confidence parse· fetched 4 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:29863 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 4 months ago·verify at source

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