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CVE-2026-89959— s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove

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： s390/vfio-ap：修复 vfio_ap_mdev_cfg_remove 中的控制域移除逻辑 函数原本使用 从 位图（用于指定分配给该 mdev 的控制域）中清除相应位。该行为会导致那些已被显式拔出的控制域无法从 KVM 客户机中正确移除。现改为使用 函数来实现正确的位图操作。

CVSS 8.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux eeb386aeb5b7c8d2dae6a3ba49255d8a97803182< 12871a4269f139221c9fde9ea3eb69c9228f59d4 affected
eeb386aeb5b7c8d2dae6a3ba49255d8a97803182< 02e72909453dee2f8a09f78819f9a9cb902dfbdc affected
eeb386aeb5b7c8d2dae6a3ba49255d8a97803182< 4bffadde7fc49b00493fb78c6376f958998d4b8c affected
eeb386aeb5b7c8d2dae6a3ba49255d8a97803182< f7d66afc34bc6e833c8ebe56973afec35f473bc1 affected
eeb386aeb5b7c8d2dae6a3ba49255d8a97803182< 2ff68bf414de167bc138e6e211ee1ad3ab3c5052 affected
eeb386aeb5b7c8d2dae6a3ba49255d8a97803182< 6b8a02e216f6b520cc029e43ddc83956605135d5 affected
6.0 affected
< 6.0 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-89959

Vulnerability Information
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Vulnerability Title
s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove The vfio_ap_config_remove function uses the bitmap_andnot function to clear bits from the matrix_mdev->matrix.adm bitmap (specifies the control domains assigned to the mdev). This prevents the explicitly unplugged control domains from being removed the KVM guest. The bitmap_and function is used instead.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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 eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 ~ 12871a4269f139221c9fde9ea3eb69c9228f59d4 -
Linux Linux 6.0 -

II. Public POCs for CVE-2026-89959

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III. Intelligence Information for CVE-2026-89959

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Other References for CVE-2026-89959 (5)

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-2026-89914 9.3 CRITICAL KVM: arm64: Sign-extend VA for range-based TLBI invalidation
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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