CVE - CVE-2024-26712

CVE-ID
CVE-2024-26712	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe URL:https://git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe MISC:https://git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058 URL:https://git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058 MISC:https://git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882 URL:https://git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882 MISC:https://git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6 URL:https://git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6 MISC:https://git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0 URL:https://git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0 MISC:https://git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25 URL:https://git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25
Assigning CNA
kernel.org
Date Record Created
20240219	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240219)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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