vmalloc: fix buffer overflow in vrealloc_node_align()

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Summary

CVECVE-2026-46281
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-08 17:16:45 UTC
Updated2026-06-08 17:16:45 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.042570000 (date 2026-06-13)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4c5d3365882dbbc0784688784904f440d7a4c0f1 e9b057a44deff4c59c13f44672a5cc74dcd57522 git Not specified
CNA Linux Linux affected 4c5d3365882dbbc0784688784904f440d7a4c0f1 b281adf71f786c325eb6d6d1582d4d05313438a8 git Not specified
CNA Linux Linux affected 4c5d3365882dbbc0784688784904f440d7a4c0f1 82d1f01292d3f09bf063f829f8ab8de12b4280a1 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b281adf71f786c325eb6d6d1582d4d05313438a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e9b057a44deff4c59c13f44672a5cc74dcd57522 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/82d1f01292d3f09bf063f829f8ab8de12b4280a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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