TI-2023-21548 Aliases CVE-2023-40791 GHSA-fmxm-fv27-gg49

extract_user_to_sg in lib/scatterlist.c in the Linux kernel before 6.4.12 fails to unpin…

LOW 29Published 2023-10-16 · Updated 2024-08-02

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: None · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

extract_user_to_sg in lib/scatterlist.c in the Linux kernel before 6.4.12 fails to unpin pages in a certain situation, as demonstrated by a WARNING for try_grab_page.

Why it matters now

EPSS 0.00479 41st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

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::::::::	before 6.4.12	Vulnerable	Linux
cpe:2.3:o:netapp:h300s_firmware:-:::::::*	not specified by NVD	Vulnerable	NetApp
cpe:2.3:h:netapp:h300s:-:::::::*	not specified by NVD	Running on	NetApp
cpe:2.3:o:netapp:h500s_firmware:-:::::::*	not specified by NVD	Vulnerable	NetApp
cpe:2.3:h:netapp:h500s:-:::::::*	not specified by NVD	Running on	NetApp
cpe:2.3:o:netapp:h700s_firmware:-:::::::*	not specified by NVD	Vulnerable	NetApp
cpe:2.3:h:netapp:h700s:-:::::::*	not specified by NVD	Running on	NetApp
cpe:2.3:o:netapp:h410s_firmware:-:::::::*	not specified by NVD	Vulnerable	NetApp
cpe:2.3:h:netapp:h410s:-:::::::*	not specified by NVD	Running on	NetApp

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 6.4.12 Vulnerable ·Linux
cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

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

Not affected: 4 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Timeline

2026-10-02 Threatist record created from CVE-2023-40791
2026-10-03 Alias added: GHSA-fmxm-fv27-gg49

References

Exploit 1

https://lkml.org/lkml/2023/8/3/323

Patch 2

Advisory 1

https://security.netapp.com/advisory/ntap-20231110-0009/

Other 1

https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.4.12

Sources

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