High 7.8Published Sep 24, 2026

CVE-2026-97421RDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz()

Updated under an hour ago (Oct 28, 2026, 9:00 PM ET)

Does this affect you?

It affects Linux. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from a40c20dabdf9045270767c75918feb67f0727c89 before 3014da7587ce006cd08004fd6b257626b314e0a3; from a40c20dabdf9045270767c75918feb67f0727c89 before ddccf6cc3861de2fe60986933bead79220e0d797; from a40c20dabdf9045270767c75918feb67f0727c89 before e9bbb5f5349ef560ff6f0395564f04c3aa664559; from a40c20dabdf9045270767c75918feb67f0727c89 before ae3cf7d2c4d506c5c91746321644e1a08d989e2a; from a40c20dabdf9045270767c75918feb67f0727c89 before 5fc5b73109540809b094710fac44da81dd8a3ff8; from a40c20dabdf9045270767c75918feb67f0727c89 before 09ea6837a0434fb4db99528a5055b6d822135dcf; 85e40ba1c4a5246b35e91c2ed69d4680426904d7; 59f07434b297e2268f5d5c567db5b09145245cf1; and 4 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/3014da7587ce006cd08004fd6b257626b314e0a3
https://git.kernel.org/stable/c/ddccf6cc3861de2fe60986933bead79220e0d797
https://git.kernel.org/stable/c/e9bbb5f5349ef560ff6f0395564f04c3aa664559
https://git.kernel.org/stable/c/ae3cf7d2c4d506c5c91746321644e1a08d989e2a
https://git.kernel.org/stable/c/5fc5b73109540809b094710fac44da81dd8a3ff8
https://git.kernel.org/stable/c/09ea6837a0434fb4db99528a5055b6d822135dcf

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.