Bug 2492755 (CVE-2026-53133) - CVE-2026-53133 kernel: RDMA/umem: Fix truncation for block sizes >= 4G
Summary: CVE-2026-53133 kernel: RDMA/umem: Fix truncation for block sizes >= 4G
Keywords:
Status: NEW
Alias: CVE-2026-53133
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-25 10:04 UTC by OSIDB Bzimport
Modified: 2026-06-25 23:20 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-06-25 10:04:02 UTC 
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 __rdma_block_iter_next() 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.
Comment 1 Keith Grant 2026-06-25 23:14:29 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062542-CVE-2026-53133-de02@gregkh/T
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