KVM: s390: Take srcu when importing watchpoint data

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89922
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:17:01 UTC
Updated2026-09-16 15:18:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: s390: Take srcu when importing watchpoint data __import_wp_info() backs up the original guest memory contents of a watchpoint with read_guest_abs(), which is kvm_read_guest() and therefore resolves the memslot via __kvm_memslots(). That requires kvm->srcu (or kvm->slots_lock) to be held, otherwise a concurrent memslot update can free the memslots array under us once its SRCU grace period has elapsed. As this is not fast path, following lock ordering (mutex first, then srcu) take the big hammer and hold the srcu for the full import.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 6830fbc3724bf49c142aae69a4694f115fa9cedd git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 f8e3a9997d5ecd56ebe4b262ff424516c068fecb git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 76f5b4ea9ed0aa5a34bda9d8a878f2c73026ec03 git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 cc710ee45395efb4937e042960f791d33924e5f6 git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 4c05bf21d1806853e662cc19e744736a3408f155 git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 a4e482def8533ebace517d9f67f1465841b1f982 git Not specified
CNA Linux Linux affected 3.16 Not specified
CNA Linux Linux unaffected 3.16 semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f8e3a9997d5ecd56ebe4b262ff424516c068fecb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc710ee45395efb4937e042960f791d33924e5f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/76f5b4ea9ed0aa5a34bda9d8a878f2c73026ec03 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6830fbc3724bf49c142aae69a4694f115fa9cedd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4c05bf21d1806853e662cc19e744736a3408f155 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a4e482def8533ebace517d9f67f1465841b1f982 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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