All vulnerabilities
CVE-2026-97593

Linux: iommu/s390: Fix NULL dereference in iova_to_phys() with ZPCI_TABLE_TYPE_RFX

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in41b5e0ce6801bf04d8fd3bca46e8c393349ebd5cAlso 20db6573301e66cd65ebf6c130b6563c69374d9dCVE List
Published25 Sep 2026Updated 19 Oct 2026CVE List

What fixes it

  • 41b5e0ce6801bf04d8fd3bca46e8c393349ebd5cLinuxCVE List
  • 20db6573301e66cd65ebf6c130b6563c69374d9dLinuxCVE List

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:

iommu/s390: Fix NULL dereference in iova_to_phys() with ZPCI_TABLE_TYPE_RFX

When using a 5-level translation table via ZPCI_TABLE_TYPE_RFX get_rso_from_iova() returns NULL when the region-first entry is invalid. Yet in get_rto_from_iova() the region-second origin rso is not checked to be non-NULL before accessing rso[rsx] leading to a NULL pointer dereference instead of a NULL return when iova_to_phys() is called on a unmapped IOVA. Fix this by adding the missing NULL check.

Text from CVE List

Affected versions 8

  • Linuxaffected: 81244074b518aeb90de5f68e7e825564c29c5c50 before d0502ed0a1aae97e2ab7a21545903ba612d9f02eCVE List
  • Linuxaffected: 81244074b518aeb90de5f68e7e825564c29c5c50 before 41b5e0ce6801bf04d8fd3bca46e8c393349ebd5cCVE List
  • Linuxaffected: 81244074b518aeb90de5f68e7e825564c29c5c50 before 20db6573301e66cd65ebf6c130b6563c69374d9dCVE List
  • Linuxaffected: 6.16CVE List
  • Linuxunaffected: all versions before 6.16CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2.7 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 3