CVE-2026-53133: RDMA/umem: Fix truncation for block sizes >= 4G
In the Linux kernel, the following vulnerability has been resolved:
RDMA/umem: Fix truncation for block sizes >= 4G
When the iommu is used the linearization of the mapping can give a single block that is very large split across multiple SG entries.
When rdmablockiternext() reassembles the split SG entries it is overflowing the 32 bit stack values and computed the wrong DMA addresses for blocks after the truncation.
Use the right types to hold DMA addresses.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-53133?
The severity of CVE-2026-53133 is high, with a CVSS score of 7.8.
How do I fix CVE-2026-53133?
To mitigate CVE-2026-53133, update the Linux kernel to the latest version that includes the fix.
What is CVE-2026-53133?
CVE-2026-53133 addresses a vulnerability in the Linux kernel related to RDMA/umem and block size truncation for sizes greater than or equal to 4G.
Who is affected by CVE-2026-53133?
Systems running affected versions of the Linux kernel that utilize RDMA functionalities may be at risk from CVE-2026-53133.
What systems are impacted by CVE-2026-53133?
CVE-2026-53133 impacts the Linux kernel and specifically affects Microsoft azl3 kernel 6.6.141.1-1.