{"id":"CVE-2026-89924","state":"PUBLISHED","title":"KVM: s390: Fix old_data leak in guest debug error path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Fix old_data leak in guest debug error path\n\n__import_wp_info() allocates a per-watchpoint old_data buffer to back up\nthe original guest memory contents. If a later watchpoint of the same\nKVM_SET_GUEST_DEBUG request fails to import, kvm_s390_import_bp_data()\njumps to the error label, which frees the wp_info array but not the\nold_data buffers of the entries that were imported successfully. Up to\nMAX_BP_COUNT - 1 buffers of up to MAX_WP_SIZE bytes are leaked per failed\nrequest, and the request can be repeated.\n\nCreate error handling for cleaning up all created old_data memory\nareas.","publishedAt":"2026-09-16T10:32:17.442Z","updatedAt":"2026-10-19T08:54:59.186Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"124c81ee610e1fbdd93d4399f88d9e28ba97a941","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"c85d402553987777cc4742751437ea5dcbf98a7b","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"5fbf319137735252eefa507193c9a619af5b7457","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"4048d0a252163084794be3e37995b872c5178913","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"f55e4d415d95342d5753e528e05a1e8623992c3f","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"46cb8a273e2f853f89a78b59dbdff8787b6e1c86","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"aa9c8e8baf1e765fa65b93212522c636f25d846f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/guestdbg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.16","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/guestdbg.c"]}],"references":["https://git.kernel.org/stable/c/124c81ee610e1fbdd93d4399f88d9e28ba97a941","https://git.kernel.org/stable/c/e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4","https://git.kernel.org/stable/c/c85d402553987777cc4742751437ea5dcbf98a7b","https://git.kernel.org/stable/c/5fbf319137735252eefa507193c9a619af5b7457","https://git.kernel.org/stable/c/4048d0a252163084794be3e37995b872c5178913","https://git.kernel.org/stable/c/f55e4d415d95342d5753e528e05a1e8623992c3f","https://git.kernel.org/stable/c/46cb8a273e2f853f89a78b59dbdff8787b6e1c86","https://git.kernel.org/stable/c/aa9c8e8baf1e765fa65b93212522c636f25d846f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89924.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89924","state":"PUBLISHED","datePublished":"2026-09-16T10:32:17.442Z","dateUpdated":"2026-10-19T08:54:59.186Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.775Z"},"containers":{"cna":{"title":"KVM: s390: Fix old_data leak in guest debug error path","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Fix old_data leak in guest debug error path\n\n__import_wp_info() allocates a per-watchpoint old_data buffer to back up\nthe original guest memory contents. If a later watchpoint of the same\nKVM_SET_GUEST_DEBUG request fails to import, kvm_s390_import_bp_data()\njumps to the error label, which frees the wp_info array but not the\nold_data buffers of the entries that were imported successfully. Up to\nMAX_BP_COUNT - 1 buffers of up to MAX_WP_SIZE bytes are leaked per failed\nrequest, and the request can be repeated.\n\nCreate error handling for cleaning up all created old_data memory\nareas."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"124c81ee610e1fbdd93d4399f88d9e28ba97a941","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"c85d402553987777cc4742751437ea5dcbf98a7b","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"5fbf319137735252eefa507193c9a619af5b7457","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"4048d0a252163084794be3e37995b872c5178913","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"f55e4d415d95342d5753e528e05a1e8623992c3f","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"46cb8a273e2f853f89a78b59dbdff8787b6e1c86","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"aa9c8e8baf1e765fa65b93212522c636f25d846f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/guestdbg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.16","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/guestdbg.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/124c81ee610e1fbdd93d4399f88d9e28ba97a941"},{"url":"https://git.kernel.org/stable/c/e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4"},{"url":"https://git.kernel.org/stable/c/c85d402553987777cc4742751437ea5dcbf98a7b"},{"url":"https://git.kernel.org/stable/c/5fbf319137735252eefa507193c9a619af5b7457"},{"url":"https://git.kernel.org/stable/c/4048d0a252163084794be3e37995b872c5178913"},{"url":"https://git.kernel.org/stable/c/f55e4d415d95342d5753e528e05a1e8623992c3f"},{"url":"https://git.kernel.org/stable/c/46cb8a273e2f853f89a78b59dbdff8787b6e1c86"},{"url":"https://git.kernel.org/stable/c/aa9c8e8baf1e765fa65b93212522c636f25d846f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:54:59.186Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}