CVE-2024-26712 (GCVE-0-2024-26712)
Vulnerability from cvelistv5
Published
2024-04-03 14:55
Modified
2026-05-23 15:37
Severity ?
4.4 (Medium) - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
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 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 663c0c9496a69f80011205ba3194049bcafd681d
Version: 663c0c9496a69f80011205ba3194049bcafd681d
Version: 663c0c9496a69f80011205ba3194049bcafd681d
Version: 663c0c9496a69f80011205ba3194049bcafd681d
Version: 663c0c9496a69f80011205ba3194049bcafd681d
Version: 663c0c9496a69f80011205ba3194049bcafd681d
Version: 5ce93076d8ee2a0fac3ad4adbd2e91b6197146db
Version: 5.3.6   ≤
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