CVE-2024-26712

Medium

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.

Package Linux Kernel
Published 2024-04-03
Last modified 2025-04-08
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

4.4

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 5.3.6, 5.4 and later are affected. Fixed in 5.10.210, 5.15.149, 6.1.79, 6.6.18, 6.7.6, 6.8 and their respective stable series.

Affected from
≥ 5.3.6 ≥ 5.4
Fixed in
✓ 5.10.210 5.10.x ✓ 5.15.149 5.15.x ✓ 6.1.79 6.1.x ✓ 6.6.18 6.6.x ✓ 6.7.6 6.7.x ✓ 6.8

References

7 total
Showing 5 of 7 references View all on NVD

Frequently asked questions

  • What is CVE-2024-26712?

    CVE-2024-26712 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.4 out of 10 . It affects Linux kernel versions from 5.3.6 onward and has been patched in 5.10.210, 5.15.149, 6.1.79 and others. CVE-2024-26712 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2024-26712?

    CVE-2024-26712 has a CVSS score of 4.4 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H .

  • Is there a patch available for CVE-2024-26712?

    Yes. CVE-2024-26712 has been patched. Fixed versions include 5.10.210, 5.15.149, 6.1.79 and others. If you are running Linux kernel 5.3.6 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2024-26712 actively exploited?

    No. CVE-2024-26712 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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