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CVE-2026-89925— KVM: s390: Fix memory leak in guest debug handling

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，以下漏洞已被修复： KVM: s390：修复来宾调试处理中的内存泄漏 bp_data 仅在错误情况下通过 kfree(bp_data) 被释放。每次成功执行 KVM_SET_GUEST_DEBUG 时，都会导致 bp_data 发生内存泄漏。

AI Predicted 5.5 Difficulty: Hard EPSS 0.22% · P11

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 27291e2165b6de70c476b7b675308113edd69a60< 39e7cebb889839b5762c9ad22e2d715b5883b288 affected
27291e2165b6de70c476b7b675308113edd69a60< 58b1b729a9f90c80b508fc3e2174cbc0ee50859e affected
27291e2165b6de70c476b7b675308113edd69a60< 9071f75cbde3bf46119cb28e92cfbef830c4bf97 affected
27291e2165b6de70c476b7b675308113edd69a60< 5940418e4232a2ff1d30ba12e0d213dbf48f0a83 affected
27291e2165b6de70c476b7b675308113edd69a60< fc2034c431adcbaabf5f8a01912358f07355349e affected
27291e2165b6de70c476b7b675308113edd69a60< 44bf3792c10f4bb3de507391f1837e020d92eaa2 affected
27291e2165b6de70c476b7b675308113edd69a60< 581be9f6085834188cef1ad2f07babf3b421e409 affected
27291e2165b6de70c476b7b675308113edd69a60< 121ea1de927c8b9bfdf53c31cad27b86d5de0293 affected
… +10 more rows
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I. Basic Information for CVE-2026-89925

Vulnerability Information
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Vulnerability Title
KVM: s390: Fix memory leak in guest debug handling
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix memory leak in guest debug handling bp_data is freed only for the error case by kfree(bp_data). Every successful KVM_SET_GUEST_DEBUG will leak bp_data.
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 ~ 39e7cebb889839b5762c9ad22e2d715b5883b288 -
Linux Linux 3.16 -

II. Public POCs for CVE-2026-89925

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III. Intelligence Information for CVE-2026-89925

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Other References for CVE-2026-89925 (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

V. Comments for CVE-2026-89925

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