CVE-2023-40791Public exploit

Kernel state corruption via incorrect page release

Published Oct 16, 2023 · Updated Aug 2, 2024

Improper page cleanup in the Linux kernel before 6.4.12 allows local users to corrupt page-pin accounting through crafted sendmsg input. The extract_user_to_sg error path calls put_page for pages pinned from IOVEC or UBUF sources instead of unpin_user_page. Reaching this path through an AF_ALG hash socket produces a try_grab_page warning and leaves kernel page-pin state inconsistent.

CVSS severity6.3
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper page cleanup in the Linux kernel before 6.4.12 allows local users to corrupt page-pin accounting through crafted sendmsg input. The extract_user_to_sg error path calls put_page for pages pinned from IOVEC or UBUF sources instead of unpin_user_page. Reaching this path through an AF_ALG hash socket produces a try_grab_page warning and leaves kernel page-pin state inconsistent.

The record

CVE
CVE-2023-40791
Published
Oct 16, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.3NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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