---
id: CVE-2026-23007
title: 'block: zero non-PI portion of auto integrity buffer'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  block: zero non-PI portion of auto integrity buffer

  The auto-generated integrity buffer for writes needs to be fully
  initialized before being passed to the underlying …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c546d6f438338017480d105ab597292da67f6f6a <
    765bf0a5880777c04ae98fc2a9f3b995737b3a64
  - >-
    Linux >= c546d6f438338017480d105ab597292da67f6f6a <
    d6072557b90e0c557df319a56f4a9dc482706d2c
  - >-
    Linux >= c546d6f438338017480d105ab597292da67f6f6a <
    ca22c566b89164f6e670af56ecc45f47ef3df819
  - Linux 6.11
exploitAvailable: true
published: '2026-01-25'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:38:50.601Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23007'
references:
  - url: 'https://git.kernel.org/stable/c/765bf0a5880777c04ae98fc2a9f3b995737b3a64'
  - url: 'https://git.kernel.org/stable/c/d6072557b90e0c557df319a56f4a9dc482706d2c'
  - url: 'https://git.kernel.org/stable/c/ca22c566b89164f6e670af56ecc45f47ef3df819'
tags:
  - cve.org
  - exploit-available
epss: 0.00202
epssPercentile: 0.10033
exploits:
  github: 1
  githubRepos:
    - >-
      https://github.com/George0Papasotiriou/CVE-2026-23007-Serverless-Cold-Start-Memory-Remanence-Data-Leakage-
  checkedAt: '2026-10-27T17:02:18.870Z'
ingestedAt: '2026-10-21T12:48:53.673Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

block: zero non-PI portion of auto integrity buffer

The auto-generated integrity buffer for writes needs to be fully
initialized before being passed to the underlying block device,
otherwise the uninitialized memory can be read back by userspace or
anyone with physical access to the storage device. If protection
information is generated, that portion of the integrity buffer is
already initialized. The integrity data is also zeroed if PI generation
is disabled via sysfs or the PI tuple size is 0. However, this misses
the case where PI is generated and the PI tuple size is nonzero, but the
metadata size is larger than the PI tuple. In this case, the remainder
("opaque") of the metadata is left uninitialized.
Generalize the BLK_INTEGRITY_CSUM_NONE check to cover any case when the
metadata is larger than just the PI tuple.

## Affected

- `Linux >= c546d6f438338017480d105ab597292da67f6f6a < 765bf0a5880777c04ae98fc2a9f3b995737b3a64`
- `Linux >= c546d6f438338017480d105ab597292da67f6f6a < d6072557b90e0c557df319a56f4a9dc482706d2c`
- `Linux >= c546d6f438338017480d105ab597292da67f6f6a < ca22c566b89164f6e670af56ecc45f47ef3df819`
- `Linux 6.11`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.