CVE-2026-89924

Summary

In 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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux27291e2165b6de70c476b7b675308113edd69a60 < 124c81ee610e1fbdd93d4399f88d9e28ba97a941affected
LinuxLinux27291e2165b6de70c476b7b675308113edd69a60 < e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4affected
LinuxLinux27291e2165b6de70c476b7b675308113edd69a60 < c85d402553987777cc4742751437ea5dcbf98a7baffected
LinuxLinux27291e2165b6de70c476b7b675308113edd69a60 < 5fbf319137735252eefa507193c9a619af5b7457affected
LinuxLinux27291e2165b6de70c476b7b675308113edd69a60 < 4048d0a252163084794be3e37995b872c5178913affected
LinuxLinux27291e2165b6de70c476b7b675308113edd69a60 < f55e4d415d95342d5753e528e05a1e8623992c3faffected
LinuxLinux27291e2165b6de70c476b7b675308113edd69a60 < 46cb8a273e2f853f89a78b59dbdff8787b6e1c86affected
LinuxLinux27291e2165b6de70c476b7b675308113edd69a60 < aa9c8e8baf1e765fa65b93212522c636f25d846faffected
LinuxLinux3.16affected
LinuxLinux0 < 3.16unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References