KVM: s390: Fix old_data leak in guest debug error path

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89924
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:17:01 UTC
Updated2026-09-16 11:17:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix old_data leak in guest debug error path __import_wp_info() allocates a per-watchpoint old_data buffer to back up the original guest memory contents. If a later watchpoint of the same KVM_SET_GUEST_DEBUG request fails to import, kvm_s390_import_bp_data() jumps to the error label, which frees the wp_info array but not the old_data buffers of the entries that were imported successfully. Up to MAX_BP_COUNT - 1 buffers of up to MAX_WP_SIZE bytes are leaked per failed request, and the request can be repeated. Create error handling for cleaning up all created old_data memory areas.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 124c81ee610e1fbdd93d4399f88d9e28ba97a941 git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4 git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 c85d402553987777cc4742751437ea5dcbf98a7b git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 5fbf319137735252eefa507193c9a619af5b7457 git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 4048d0a252163084794be3e37995b872c5178913 git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 f55e4d415d95342d5753e528e05a1e8623992c3f git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 46cb8a273e2f853f89a78b59dbdff8787b6e1c86 git Not specified
CNA Linux Linux affected 27291e2165b6de70c476b7b675308113edd69a60 aa9c8e8baf1e765fa65b93212522c636f25d846f git Not specified
CNA Linux Linux affected 3.16 Not specified
CNA Linux Linux unaffected 3.16 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* 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/5fbf319137735252eefa507193c9a619af5b7457 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4048d0a252163084794be3e37995b872c5178913 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c85d402553987777cc4742751437ea5dcbf98a7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f55e4d415d95342d5753e528e05a1e8623992c3f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/46cb8a273e2f853f89a78b59dbdff8787b6e1c86 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/124c81ee610e1fbdd93d4399f88d9e28ba97a941 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aa9c8e8baf1e765fa65b93212522c636f25d846f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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