---
id: CVE-2024-26712
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  powerpc/kasan: Fix addr error caused by page alignment

  In kasan_init_region, when k_start is not page aligned, at the begin of
  for loop, k_cur = k_start & PAGE_MASK is…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  powerpc/kasan: Fix addr error caused by page alignment

  In kasan_init_region, when k_start is not page aligned, at the begin of
  for loop, k_cur = k_start & PAGE_MASK is…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.4, < 5.10.210'
  - 'linux_kernel >= 5.11, < 5.15.149'
  - 'linux_kernel >= 5.16, < 6.1.79'
  - 'linux_kernel >= 6.2, < 6.6.18'
  - 'linux_kernel >= 6.7, < 6.7.6'
  - linux_kernel = 6.8
  - debian_linux = 10.0
patched:
  - linux_kernel 6.7.6
published: '2024-04-03'
updated: '2026-08-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-26712'
references:
  - url: 'https://git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00248
epssPercentile: 0.14357
ingestedAt: '2026-08-05T10:46:48.174Z'
---

## Overview

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

powerpc/kasan: Fix addr error caused by page alignment

In kasan_init_region, when k_start is not page aligned, at the begin of
for loop, k_cur = k_start & PAGE_MASK is less than k_start, and then
`va = block + k_cur - k_start` is less than block, the addr va is invalid,
because the memory address space from va to block is not alloced by
memblock_alloc, which will not be reserved by memblock_reserve later, it
will be used by other places.

As a result, memory overwriting occurs.

for example:
int __init __weak kasan_init_region(void *start, size_t size)
{
[...]
	/* if say block(dcd97000) k_start(feef7400) k_end(feeff3fe) */
	block = memblock_alloc(k_end - k_start, PAGE_SIZE);
	[...]
	for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) {
		/* at the begin of for loop
		 * block(dcd97000) va(dcd96c00) k_cur(feef7000) k_start(feef7400)
		 * va(dcd96c00) is less than block(dcd97000), va is invalid
		 */
		void *va = block + k_cur - k_start;
		[...]
	}
[...]
}

Therefore, page alignment is performed on k_start before
memblock_alloc() to ensure the validity of the VA address.

## Affected

- `linux_kernel >= 5.4, < 5.10.210`
- `linux_kernel >= 5.11, < 5.15.149`
- `linux_kernel >= 5.16, < 6.1.79`
- `linux_kernel >= 6.2, < 6.6.18`
- `linux_kernel >= 6.7, < 6.7.6`
- `linux_kernel = 6.8`
- `debian_linux = 10.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.7.6`