Libvirt: integer overflow in nodegetfreepages rpc handler leading to heap buffer overflow
Priority LOW 35CWE-190Published · 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
- Partial Red Hat: 18 fixed, 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00182 7th percentileScored 2026-11-07
Fix Partial Red Hat: 10 advisoriesRed Hat: 18 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | 11.10.0-12.9.el10_2 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — | 10.10.0-8.12.el10_0 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — | 4.5.0-36.el7_9.7 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — | 8040020260916092751.522a0ee4 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | — | 8040020260916092751.522a0ee4 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — | 8060020260910092451.ad008a3a | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | — | 8060020260910092451.ad008a3a | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | — | 8080020260910092120.63b34585 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | — | 8080020260910092120.63b34585 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 11.10.0-12.7.el9_8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — | 9.0.0-10.17.el9_2 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | — | 10.0.0-6.24.el9_4 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — | 10.10.0-7.19.el9_6 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux for NVIDIA 26 | — | — | No fix listed | CNA |
- Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 11.10.0-12.9.el10_2 Patch available CNA
- Red Hat Enterprise Linux 10.0 Extended Update Support VendorRed Hat Affected — Fixed in 10.10.0-8.12.el10_0 Patch available CNA
- Red Hat Enterprise Linux 7 Extended Lifecycle Support VendorRed Hat Affected — Fixed in 4.5.0-36.el7_9.7 Patch available CNA
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support VendorRed Hat Affected — Fixed in 8040020260916092751.522a0ee4 Patch available CNA
- Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On VendorRed Hat Affected — Fixed in 8040020260916092751.522a0ee4 Patch available CNA
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support VendorRed Hat Affected — Fixed in 8060020260910092451.ad008a3a Patch available CNA
- Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On VendorRed Hat Affected — Fixed in 8060020260910092451.ad008a3a Patch available CNA
- Red Hat Enterprise Linux 8.8 Telecommunications Update Service VendorRed Hat Affected — Fixed in 8080020260910092120.63b34585 Patch available CNA
- Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 8080020260910092120.63b34585 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 11.10.0-12.7.el9_8 Patch available CNA
- Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 9.0.0-10.17.el9_2 Patch available CNA
- Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 10.0.0-6.24.el9_4 Patch available CNA
- Red Hat Enterprise Linux 9.6 Extended Update Support VendorRed Hat Affected — Fixed in 10.10.0-7.19.el9_6 Patch available CNA
- Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux for NVIDIA 26 VendorRed Hat Affected — Fixed in — No fix listed CNA
CPE names CNA · 18
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:/o:redhat:enterprise_linux:10.2 | 10.2 | — | Red Hat |
| cpe:/o:redhat:enterprise_linux_eus:10.0 | 10.0 | — | Red Hat |
| cpe:/o:redhat:rhel_els:7 | 7 | — | Red Hat |
| cpe:/a:redhat:rhel_aus:8.4::appstream | 8.4 | — | Red Hat |
| cpe:/a:redhat:rhel_eus_long_life:8.4::appstream | 8.4 | — | Red Hat |
| cpe:/a:redhat:rhel_aus:8.6::appstream | 8.6 | — | Red Hat |
| cpe:/a:redhat:rhel_eus_long_life:8.6::appstream | 8.6 | — | Red Hat |
| cpe:/a:redhat:rhel_e4s:8.8::appstream | 8.8 | — | Red Hat |
| cpe:/a:redhat:rhel_tus:8.8::appstream | 8.8 | — | Red Hat |
| cpe:/a:redhat:enterprise_linux:9::appstream | 9 | — | Red Hat |
- cpe:/o:redhat:enterprise_linux:10.2 Versions 10.2 — ·Red Hat
- cpe:/o:redhat:enterprise_linux_eus:10.0 Versions 10.0 — ·Red Hat
- cpe:/o:redhat:rhel_els:7 Versions 7 — ·Red Hat
- cpe:/a:redhat:rhel_aus:8.4::appstream Versions 8.4 — ·Red Hat
- cpe:/a:redhat:rhel_eus_long_life:8.4::appstream Versions 8.4 — ·Red Hat
- cpe:/a:redhat:rhel_aus:8.6::appstream Versions 8.6 — ·Red Hat
- cpe:/a:redhat:rhel_eus_long_life:8.6::appstream Versions 8.6 — ·Red Hat
- cpe:/a:redhat:rhel_e4s:8.8::appstream Versions 8.8 — ·Red Hat
- cpe:/a:redhat:rhel_tus:8.8::appstream Versions 8.8 — ·Red Hat
- cpe:/a:redhat:enterprise_linux:9::appstream Versions 9 — ·Red Hat
Show 8 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:/a:redhat:enterprise_linux:9::crb | 9 | — | Red Hat |
| cpe:/a:redhat:rhel_e4s:9.2::appstream | 9.2 | — | Red Hat |
| cpe:/a:redhat:rhel_e4s:9.4::appstream | 9.4 | — | Red Hat |
| cpe:/a:redhat:rhel_eus:9.6::appstream | 9.6 | — | Red Hat |
| cpe:/a:redhat:rhel_eus:9.6::crb | 9.6 | — | Red Hat |
| cpe:/o:redhat:rhel_els:6 | 6 | — | Red Hat |
| cpe:/a:redhat:enterprise_linux:8 | 8 | — | Red Hat |
| cpe:/a:redhat:enterprise_linux_nvidia: | — | — | Red Hat |
- cpe:/a:redhat:enterprise_linux:9::crb Versions 9 — ·Red Hat
- cpe:/a:redhat:rhel_e4s:9.2::appstream Versions 9.2 — ·Red Hat
- cpe:/a:redhat:rhel_e4s:9.4::appstream Versions 9.4 — ·Red Hat
- cpe:/a:redhat:rhel_eus:9.6::appstream Versions 9.6 — ·Red Hat
- cpe:/a:redhat:rhel_eus:9.6::crb Versions 9.6 — ·Red Hat
- cpe:/o:redhat:rhel_els:6 Versions 6 — ·Red Hat
- cpe:/a:redhat:enterprise_linux:8 Versions 8 — ·Red Hat
- cpe:/a:redhat:enterprise_linux_nvidia: Versions — — ·Red Hat
Remediation
Red Hat 10 advisories
- RHSA-2026:75583 Released 2026-10-05 · Red Hat rating Importantlibvirt security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 10) libvirt-11.10.0-12.9.el10_2, libvirt-client-11.10.0-12.9.el10_2, libvirt-client-qemu-11.10.0-12.9.el10_2 +26
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libvirt-daemon-plugin-sanlock-11.10.0-12.9.el10_2, libvirt-devel-11.10.0-12.9.el10_2, libvirt-docs-11.10.0-12.9.el10_2
- RHSA-2026:74424 Released 2026-10-02 · Red Hat rating Importantlibvirt security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 9) libvirt-11.10.0-12.7.el9_8, libvirt-client-11.10.0-12.7.el9_8, libvirt-client-qemu-11.10.0-12.7.el9_8 +26
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libvirt-daemon-plugin-sanlock-11.10.0-12.7.el9_8, libvirt-devel-11.10.0-12.7.el9_8, libvirt-docs-11.10.0-12.7.el9_8
- RHSA-2026:69131 Released 2026-09-21 · Red Hat rating Importantvirt:rhel security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) hivex-1.3.18-21.module+el8.4.0+10770+19c037f9.src::virt:rhel, hivex-1.3.18-21.module+el8.4.0+10770+19c037f9.x86_64::virt:rhel, hivex-devel-1.3.18-21.module+el8.4.0+10770+19c037f9.x86_64::virt:rhel +47
- Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) SLOF-20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418.noarch::virt:rhel, SLOF-20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418.src::virt:rhel, hivex-1.3.18-21.module+el8.4.0+10770+19c037f9.aarch64::virt:rhel +47
Show 7 more Red Hat advisories
- RHSA-2026:69114 Released 2026-09-21 · Red Hat rating Importantlibvirt security update
- Red Hat Enterprise Linux Server (v. 7 ELS) libvirt-4.5.0-36.el7_9.7, libvirt-bash-completion-4.5.0-36.el7_9.7, libvirt-client-4.5.0-36.el7_9.7 +26
- Red Hat Enterprise Linux Server Optional (v. 7 ELS) libvirt-admin-4.5.0-36.el7_9.7, libvirt-daemon-lxc-4.5.0-36.el7_9.7, libvirt-lock-sanlock-4.5.0-36.el7_9.7 +3
- RHSA-2026:68594 Released 2026-09-17 · Red Hat rating Importantvirt:rhel security update
- Red Hat Enterprise Linux AppStream AUS (v.8.6) hivex-1.3.18-23.module+el8.6.0+14480+c0a3aa0f.src::virt:rhel, hivex-1.3.18-23.module+el8.6.0+14480+c0a3aa0f.x86_64::virt:rhel, hivex-devel-1.3.18-23.module+el8.6.0+14480+c0a3aa0f.x86_64::virt:rhel +47
- Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) SLOF-20210217-1.module+el8.6.0+14480+c0a3aa0f.noarch::virt:rhel, SLOF-20210217-1.module+el8.6.0+14480+c0a3aa0f.src::virt:rhel, hivex-1.3.18-23.module+el8.6.0+14480+c0a3aa0f.aarch64::virt:rhel +47
- RHSA-2026:68511 Released 2026-09-17 · Red Hat rating Importantlibvirt security update
- Red Hat CodeReady Linux Builder EUS (v.9.6) libvirt-daemon-plugin-sanlock-10.10.0-7.19.el9_6, libvirt-devel-10.10.0-7.19.el9_6, libvirt-docs-10.10.0-7.19.el9_6
- Red Hat Enterprise Linux AppStream EUS (v.9.6) libvirt-10.10.0-7.19.el9_6, libvirt-client-10.10.0-7.19.el9_6, libvirt-client-qemu-10.10.0-7.19.el9_6 +26
- RHSA-2026:68513 Released 2026-09-17 · Red Hat rating Importantvirt:rhel security update
- Red Hat Enterprise Linux AppStream E4S (v.8.8) SLOF-20210217-2.module+el8.8.0+20737+daad9f3b.noarch::virt:rhel, SLOF-20210217-2.module+el8.8.0+20737+daad9f3b.src::virt:rhel, hivex-1.3.18-23.module+el8.8.0+16781+9f4724c2.ppc64le::virt:rhel +47
- Red Hat Enterprise Linux AppStream TUS (v.8.8) hivex-1.3.18-23.module+el8.8.0+16781+9f4724c2.src::virt:rhel, hivex-1.3.18-23.module+el8.8.0+16781+9f4724c2.x86_64::virt:rhel, hivex-devel-1.3.18-23.module+el8.8.0+16781+9f4724c2.x86_64::virt:rhel +47
- RHSA-2026:68509 Released 2026-09-17 · Red Hat rating Importantlibvirt security update
- Red Hat Enterprise Linux AppStream E4S (v.9.4) libvirt-10.0.0-6.24.el9_4, libvirt-client-10.0.0-6.24.el9_4, libvirt-client-qemu-10.0.0-6.24.el9_4 +25
- RHSA-2026:68510 Released 2026-09-17 · Red Hat rating Importantlibvirt security update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) libvirt-10.10.0-8.12.el10_0, libvirt-client-10.10.0-8.12.el10_0, libvirt-client-qemu-10.10.0-8.12.el10_0 +26
- Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libvirt-daemon-plugin-sanlock-10.10.0-8.12.el10_0, libvirt-devel-10.10.0-8.12.el10_0, libvirt-docs-10.10.0-8.12.el10_0
- RHSA-2026:68514 Released 2026-09-17 · Red Hat rating Importantlibvirt security update
- Red Hat Enterprise Linux AppStream E4S (v.9.2) libvirt-9.0.0-10.17.el9_2, libvirt-client-9.0.0-10.17.el9_2, libvirt-daemon-9.0.0-10.17.el9_2 +19
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux for NVIDIA 26 | Affected | No fix planned: Out of support scope |
| Red Hat CodeReady Linux Builder EUS (v.9.6) | Fixed | RHSA-2026:68511 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:75583 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:74424 |
| Red Hat Enterprise Linux AppStream AUS (v.8.4) | Fixed | RHSA-2026:69131 |
| Red Hat Enterprise Linux AppStream AUS (v.8.6) | Fixed | RHSA-2026:68594 |
| Red Hat Enterprise Linux AppStream E4S (v.8.8) | Fixed | RHSA-2026:68513 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:68514 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:68509 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:68510 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:68511 |
| Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) | Fixed | RHSA-2026:69131 |
| Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) | Fixed | RHSA-2026:68594 |
| Red Hat Enterprise Linux AppStream TUS (v.8.8) | Fixed | RHSA-2026:68513 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:75583 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2026:74424 |
| Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | Fixed | RHSA-2026:68510 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Fixed | RHSA-2026:69114 |
| Red Hat Enterprise Linux Server Optional (v. 7 ELS) | Fixed | RHSA-2026:69114 |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-18917
- 2026-10-03 Alias added: GHSA-6jq9-9f7w-h7mc
- 2026-10-05 Fix available: libvirt@0:11.10.0-12.9.el10_2 · CNA
- 2026-10-05 1 new reference · CNA
- 2026-10-05 Fix available: RHSA-2026:75583 · Red Hat
- 2026-10-05 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · Red Hat
References
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Sources
- CVE-2026-18917 · CVE Program
- CVE-2026-18917 · NVD
- FIRST EPSS
- GHSA-6jq9-9f7w-h7mc · GitHub Advisory Database · CC BY 4.0
- CVE-2026-18917 · Red Hat security data · CC BY 4.0
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