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CVE-2026-98593

Linux: s390/debug: Fix NULL pointer dereference in debug_info_copy()

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)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225Also 33f706884821da9cb55b650b7b1d4f2bdf800137, 2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52b and 2 moreCVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225LinuxCVE List
  • 33f706884821da9cb55b650b7b1d4f2bdf800137LinuxCVE List
  • 2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52bLinuxCVE List
  • 9c6af88fbefbe77608b77409df23a1617e28398cLinuxCVE List
  • 012bfcd5a51082d5a65f096dfb9ca652b5267965LinuxCVE 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:

s390/debug: Fix NULL pointer dereference in debug_info_copy()

When debug_register_static() fails, it clears areas, active_pages and active_entries but leaves the area bounds unchanged. Copying such an area, either by opening its view file or via debug_dump(), makes debug_info_copy() dereference the NULL pointers.

Skip the copy loop when the source has no areas.

Text from CVE List

Affected versions 16

  • Linuxaffected: d72541f945127b4873dace501406a1bc8cd8e1e9 before 13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225CVE List
  • Linuxaffected: d72541f945127b4873dace501406a1bc8cd8e1e9 before a19bede30f0da5ae56782edac62b5998a7434cbaCVE List
  • Linuxaffected: d72541f945127b4873dace501406a1bc8cd8e1e9 before 33f706884821da9cb55b650b7b1d4f2bdf800137CVE List
  • Linuxaffected: d72541f945127b4873dace501406a1bc8cd8e1e9 before 2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52bCVE List
  • Linuxaffected: d72541f945127b4873dace501406a1bc8cd8e1e9 before 9c6af88fbefbe77608b77409df23a1617e28398cCVE List
  • Linuxaffected: d72541f945127b4873dace501406a1bc8cd8e1e9 before c593f38e1cdb92f87d01be4c4e5ac12417b1454bCVE List
  • Linuxaffected: d72541f945127b4873dace501406a1bc8cd8e1e9 before 012bfcd5a51082d5a65f096dfb9ca652b5267965CVE List
  • Linuxaffected: 5.15CVE List
  • Linuxunaffected: all versions before 5.15CVE 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: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.55 through 6.18.*CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 7