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CVE-2026-97421

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

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.13%Chance of exploitation activity in the next 30 days, higher than 2% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in3014da7587ce006cd08004fd6b257626b314e0a3Also 5fc5b73109540809b094710fac44da81dd8a3ff8, 09ea6837a0434fb4db99528a5055b6d822135dcf and 3 moreCVE List
Published24 Sep 2026Updated 3 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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

Text from CVE List

Affected versions 20

  • Linuxaffected: a40c20dabdf9045270767c75918feb67f0727c89 before 3014da7587ce006cd08004fd6b257626b314e0a3CVE List
  • Linuxaffected: a40c20dabdf9045270767c75918feb67f0727c89 before ddccf6cc3861de2fe60986933bead79220e0d797CVE List
  • Linuxaffected: a40c20dabdf9045270767c75918feb67f0727c89 before e9bbb5f5349ef560ff6f0395564f04c3aa664559CVE List
  • Linuxaffected: a40c20dabdf9045270767c75918feb67f0727c89 before ae3cf7d2c4d506c5c91746321644e1a08d989e2aCVE List
  • Linuxaffected: a40c20dabdf9045270767c75918feb67f0727c89 before 5fc5b73109540809b094710fac44da81dd8a3ff8CVE List
  • Linuxaffected: a40c20dabdf9045270767c75918feb67f0727c89 before 09ea6837a0434fb4db99528a5055b6d822135dcfCVE List
  • Linuxaffected: 85e40ba1c4a5246b35e91c2ed69d4680426904d7CVE List
  • Linuxaffected: 59f07434b297e2268f5d5c567db5b09145245cf1CVE List
  • Linuxaffected: 488229b7729d7becf4c39c5e74fb709fb35115c2CVE List
  • Linuxaffected: 5.4.73 before 5.5CVE List
  • Linuxaffected: 5.8.17 before 5.9CVE List
  • Linuxaffected: 5.9.2 before 5.10CVE List
  • Linuxaffected: 5.10CVE List
  • Linuxunaffected: all versions before 5.10CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2CVE List

References 6