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CVE-2026-89926— KVM: s390: Fix length check __import_wp_info()

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 中的长度检查 是一个 类型的字段，完全由用户空间控制。该值随后被赋值给 ，而 是 类型。边界检查是在截断后的值上进行的，而内存分配却使用了未截断的原始值： 应当使用经过验证的值（即 ）来进行内存分配，以符合设计意图。 若不进行此修复，用户空间可触发大于 4GB 的内存分配请求，这类分配会失败，并因 限制而产生内核警告（WARN）。

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 27291e2165b6de70c476b7b675308113edd69a60< aef540194effd768bed0bd2e6a74fe135a3d7c3a affected
27291e2165b6de70c476b7b675308113edd69a60< 71153d3262517e1c02c3a66aa5094f279b2d1454 affected
27291e2165b6de70c476b7b675308113edd69a60< fec89d327d9b2b669b5bbdac209386c6317c3722 affected
27291e2165b6de70c476b7b675308113edd69a60< b94ab9caa5d72c78226121cccff5e33f946da900 affected
27291e2165b6de70c476b7b675308113edd69a60< beb9c55af609c4c7308259d7191688c75a4e3d4a affected
27291e2165b6de70c476b7b675308113edd69a60< 3fe801db90bdeefb0bbdda42d832846b53f64f8a affected
27291e2165b6de70c476b7b675308113edd69a60< 4c07680a467e2f7697245bcd11691bffb2a6f0ed affected
3.16 affected
… +8 more rows
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I. Basic Information for CVE-2026-89926

Vulnerability Information
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Vulnerability Title
KVM: s390: Fix length check __import_wp_info()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix length check __import_wp_info() struct kvm_hw_breakpoint::len is a __u64 that is fully controlled by user space. This is then assigned to wp_info->len, which is an int. The bounds check is done on the truncated value while the allocation uses the untruncated one: wp_info->len = bp_data->len; [...] if (wp_info->len < 0 || wp_info->len > MAX_WP_SIZE) return -EINVAL; wp_info->old_data = kmalloc(bp_data->len, GFP_KERNEL_ACCOUNT); Use the validated value for the allocation as intended. Without this fix userspace can trigger >4GB allocations which will fail and result in a WARN due to MAX_PAGE_ORDER.
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 ~ aef540194effd768bed0bd2e6a74fe135a3d7c3a -
Linux Linux 3.16 -

II. Public POCs for CVE-2026-89926

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III. Intelligence Information for CVE-2026-89926

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Other References for CVE-2026-89926 (7)

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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