CVE-2026-46281
Description
AI Translation Available
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.
https://git.kernel.org/stable/c/82d1f01292d3f09bf063f829f8ab8de12b4280a1
https://git.kernel.org/stable/c/b281adf71f786c325eb6d6d1582d4d05313438a8
https://git.kernel.org/stable/c/e9b057a44deff4c59c13f44672a5cc74dcd57522