Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.18, < 6.18.27 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/82d1f01292d3f09bf063f829f8ab8de12b4280a1Patch
- https://git.kernel.org/stable/c/b281adf71f786c325eb6d6d1582d4d05313438a8Patch
- https://git.kernel.org/stable/c/e9b057a44deff4c59c13f44672a5cc74dcd57522Patch
FAQ
What is CVE-2026-46281?
CVE-2026-46281 is a vulnerability with a CVSS score of 7.8 (HIGH). 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") ...
How severe is CVE-2026-46281?
CVE-2026-46281 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-46281?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.