CVE-2024-26712 Affecting linux-5.10 package, versions <5.10.216-1~deb10u1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.04% (12th percentile)

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  • Snyk IDSNYK-DEBIAN10-LINUX510-7371293
  • published26 Jun 2024
  • disclosed3 Apr 2024

Introduced: 3 Apr 2024

CVE-2024-26712  (opens in a new tab)

How to fix?

Upgrade Debian:10 linux-5.10 to version 5.10.216-1~deb10u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-5.10 package and not the linux-5.10 package as distributed by Debian. See How to fix? for Debian:10 relevant fixed versions and status.

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.

CVSS Scores

version 3.1