PT-2026-47353 · Linux · Linux
Published
2026-06-08
·
Updated
2026-06-08
·
CVE-2026-46281
None
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In the Linux kernel, the following vulnerability has been resolved:
vmalloc: fix buffer overflow in vrealloc node align()
Commit 4c5d3365882d ("mm/vmalloc: allow to set node and align in
vrealloc") added the ability to force a new allocation if the current
pointer is on the wrong NUMA node, or if an alignment constraint is not
met, even if the user is shrinking the allocation.
On this path (need realloc), the code allocates a new object of 'size'
bytes and then memcpy()s 'old size' bytes into it. If the request is to
shrink the object (size < old size), this results in an out-of-bounds
write on the new buffer.
Fix this by bounding the copy length by the new allocation size.
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Related Identifiers
Affected Products
Linux