What’s Vulnerable › Vulnerabilities

CVE-2023-40791

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-10-16 · updated 2026-06-17

Description

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.

Affected products

• Linux kernel: before 6.4.12 — fixed in 6.4.12
• NetApp H300S Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H700S Firmware: all versions

How to fix

Upgrade to a fixed version: Linux kernel 6.4.12. Check the vendor advisory for mitigations.

References

• https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.4.12
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f443fd5af5dbd531f880d3645d5dd36976cf087f
• https://lkml.org/lkml/2023/8/3/323
• https://lore.kernel.org/linux-crypto/20571.1690369076%40warthog.procyon.org.uk/
• https://security.netapp.com/advisory/ntap-20231110-0009/
• https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.4.12
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f443fd5af5dbd531f880d3645d5dd36976cf087f
• https://lkml.org/lkml/2023/8/3/323
• https://lore.kernel.org/linux-crypto/20571.1690369076%40warthog.procyon.org.uk/
• https://security.netapp.com/advisory/ntap-20231110-0009/

Get alerted when CVE-2023-40791 or the next vulnerability affects your stack