Bug 2540452 (CVE-2026-97421) - CVE-2026-97421 kernel: RDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz()
Summary: CVE-2026-97421 kernel: RDMA/umem: Be careful about boundary conditions in ib_...
Keywords:
Status: NEW
Alias: CVE-2026-97421
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: 2026-09-24 16:53 UTC by OSIDB Bzimport
Modified: 2026-09-29 11:15 UTC (History)
17 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-24 16:53:19 UTC 
In the Linux kernel, the following vulnerability has been resolved:

RDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz()

Several corner cases, especially important on 32 bits:

- umem->iova is u64, the function argument should pass in u64 or
  iova will be truncated
- Check that the length is not too large for the iova
- Check that lengths > 4G don't overflow the GENMASK
Comment 1 Mauro Matteo Cascella 2026-09-29 11:10:32 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97421.mbox
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