CVE-2026-18917

Libvirt: integer overflow in nodegetfreepages rpc handler leading to heap buffer overflow

State: Published
Severity: 7.8 High
Published: Aug 20, 2026
Updated: Oct 5, 2026
Reserved: Aug 5, 2026

Description

A flaw was found in libvirt. An unprivileged local user could exploit an integer overflow vulnerability in the NodeGetFreePages RPC handler. This flaw allows crafted values to bypass a size check, leading to an undersized memory buffer. Subsequently, real NUMA node data can overwrite this buffer. This heap buffer overflow can corrupt the root libvirt daemon's memory, potentially leading to a denial of service or local privilege escalation.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	redhat

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat	0:11.10.0-12.9.el10_2 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:10.10.0-8.12.el10_0 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:4.5.0-36.el7_9.7 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	8040020260916092751.522a0ee4 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	8040020260916092751.522a0ee4 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	8060020260910092451.ad008a3a and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	8060020260910092451.ad008a3a and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	8080020260910092120.63b34585 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	8080020260910092120.63b34585 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:11.10.0-12.7.el9_8 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:9.0.0-10.17.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:10.0.0-6.24.el9_4 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:10.10.0-7.19.el9_6 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux for NVIDIA 26Red Hat

References

RHSA-2026:68509vendor-advisory
RHSA-2026:68510vendor-advisory
RHSA-2026:68511vendor-advisory
RHSA-2026:68513vendor-advisory
RHSA-2026:68514vendor-advisory
RHSA-2026:68594vendor-advisory
RHSA-2026:69114vendor-advisory
RHSA-2026:69131vendor-advisory
RHSA-2026:74424vendor-advisory
RHSA-2026:75583vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-18917vdb-entry
RHBZ#2520161issue-tracking

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