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CVE-2026-89924— KVM: s390: Fix old_data leak in guest debug error path

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： KVM: s390：修复客户机调试错误路径中的 old_data 内存泄漏 __import_wp_info() 会为每个观察点分配一个 old_data 缓冲区，用于备份原始的 guest 内存内容。如果同一个 KVM_SET_GUEST_DEBUG 请求中后续的某个观察点导入失败，kvm_s390_import_bp_data() 会跳转到错误标签，该标签会释放 wp_info 数组，但不会释放那些已成功导入的条目所对应的 old_data 缓冲区。每次请求失败时，

AI Predicted 5.3 Difficulty: Moderate EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1646

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 27291e2165b6de70c476b7b675308113edd69a60< 124c81ee610e1fbdd93d4399f88d9e28ba97a941 affected
27291e2165b6de70c476b7b675308113edd69a60< e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4 affected
27291e2165b6de70c476b7b675308113edd69a60< c85d402553987777cc4742751437ea5dcbf98a7b affected
27291e2165b6de70c476b7b675308113edd69a60< 5fbf319137735252eefa507193c9a619af5b7457 affected
27291e2165b6de70c476b7b675308113edd69a60< 4048d0a252163084794be3e37995b872c5178913 affected
27291e2165b6de70c476b7b675308113edd69a60< f55e4d415d95342d5753e528e05a1e8623992c3f affected
27291e2165b6de70c476b7b675308113edd69a60< 46cb8a273e2f853f89a78b59dbdff8787b6e1c86 affected
27291e2165b6de70c476b7b675308113edd69a60< aa9c8e8baf1e765fa65b93212522c636f25d846f affected
… +10 more rows
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I. Basic Information for CVE-2026-89924

Vulnerability Information
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Vulnerability Title
KVM: s390: Fix old_data leak in guest debug error path
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 27291e2165b6de70c476b7b675308113edd69a60 ~ 124c81ee610e1fbdd93d4399f88d9e28ba97a941 -
Linux Linux 3.16 -

II. Public POCs for CVE-2026-89924

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III. Intelligence Information for CVE-2026-89924

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Other References for CVE-2026-89924 (8)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89930 9.3 CRITICAL KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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