An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel…
Priority LOW 31CWE-362Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.
Why it matters now
EPSS 0.00365 30th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 6 advisories
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.5.5 to before 4.9.228; 4.10 to before 4.14.185; 4.15 to before 4.19.129; 4.20 to before 5.4.48; 5.5 to before 5.7.5 | Vulnerable | Linux |
| cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:element_software:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:o:netapp:hci_bootstrap_os:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
| cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:h410c:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.5.5 to before 4.9.228; 4.10 to before 4.14.185; 4.15 to before 4.19.129; 4.20 to before 5.4.48; 5.5 to before 5.7.5 Vulnerable ·Linux
- cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:element_software:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:o:netapp:hci_bootstrap_os:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
- cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:h410c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
Remediation
Red Hat 6 advisories
- RHSA-2022:5626 Released 2022-07-19 · Red Hat rating Importantkernel security and bug fix update
- Red Hat Enterprise Linux BaseOS EUS (v.8.4) bpftool-4.18.0-305.57.1.el8_4, kernel-4.18.0-305.57.1.el8_4, kernel-abi-stablelists-4.18.0-305.57.1.el8_4 +19
- Red Hat Enterprise Linux CRB EUS (v.8.4) kernel-tools-libs-devel-4.18.0-305.57.1.el8_4
- RHSA-2022:5633 Released 2022-07-19 · Red Hat rating Importantkernel-rt security and bug fix update
- Red Hat Enterprise Linux NFV EUS (v.8.4) kernel-rt-4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-core-4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-debug-4.18.0-305.57.1.rt7.129.el8_4 +9
- Red Hat Enterprise Linux RT EUS (v.8.4) kernel-rt-4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-core-4.18.0-305.57.1.rt7.129.el8_4, kernel-rt-debug-4.18.0-305.57.1.rt7.129.el8_4 +7
- RHSA-2022:5220 Released 2022-06-28 · Red Hat rating Importantkernel security and bug fix update
- Red Hat CodeReady Linux Builder EUS (v. 8.2) kernel-tools-libs-devel-4.18.0-193.87.1.el8_2
- Red Hat Enterprise Linux BaseOS EUS (v. 8.2) bpftool-4.18.0-193.87.1.el8_2, kernel-4.18.0-193.87.1.el8_2, kernel-abi-whitelists-4.18.0-193.87.1.el8_2 +19
Show 3 more Red Hat advisories
- RHSA-2022:5224 Released 2022-06-28 · Red Hat rating Importantkernel-rt security and bug fix update
- Red Hat Enterprise Linux Real Time EUS (v. 8.2) kernel-rt-4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-core-4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-debug-4.18.0-193.87.1.rt13.137.el8_2 +7
- Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) kernel-rt-4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-core-4.18.0-193.87.1.rt13.137.el8_2, kernel-rt-debug-4.18.0-193.87.1.rt13.137.el8_2 +9
- RHSA-2021:4356 Released 2021-11-09 · Red Hat rating Moderatekernel security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-348.el8
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-348.el8, kernel-4.18.0-348.el8, kernel-abi-stablelists-4.18.0-348.el8 +19
- RHSA-2021:4140 Released 2021-11-09 · Red Hat rating Moderatekernel-rt security and bug fix update
- Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-348.rt7.130.el8, kernel-rt-core-4.18.0-348.rt7.130.el8, kernel-rt-debug-4.18.0-348.rt7.130.el8 +7
- Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-348.rt7.130.el8, kernel-rt-core-4.18.0-348.rt7.130.el8, kernel-rt-debug-4.18.0-348.rt7.130.el8 +9
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2021:4356 |
| Red Hat CodeReady Linux Builder EUS (v. 8.2) | Fixed | RHSA-2022:5220 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2021:4356 |
| Red Hat Enterprise Linux BaseOS EUS (v. 8.2) | Fixed | RHSA-2022:5220 |
| Red Hat Enterprise Linux BaseOS EUS (v.8.4) | Fixed | RHSA-2022:5626 |
| Red Hat Enterprise Linux CRB EUS (v.8.4) | Fixed | RHSA-2022:5626 |
| Red Hat Enterprise Linux NFV EUS (v.8.4) | Fixed | RHSA-2022:5633 |
| Red Hat Enterprise Linux RT EUS (v.8.4) | Fixed | RHSA-2022:5633 |
| Red Hat Enterprise Linux Real Time (v. 8) | Fixed | RHSA-2021:4140 |
| Red Hat Enterprise Linux Real Time EUS (v. 8.2) | Fixed | RHSA-2022:5224 |
| Red Hat Enterprise Linux Real Time for NFV (v. 8) | Fixed | RHSA-2021:4140 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) | Fixed | RHSA-2022:5224 |
Not affected: 3 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2020-29368
- 2026-10-03 Alias added: GHSA-wr2j-q648-w99g
References
Sources
- CVE-2020-29368 · CVE Program
- CVE-2020-29368 · NVD
- FIRST EPSS
- GHSA-wr2j-q648-w99g · GitHub Advisory Database · CC BY 4.0
- CVE-2020-29368 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences