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CVE-2026-74515— KVM: s390: pci: Reject adapter interrupt forwarding if already enabled

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 6.0版本至7.2-rc6之前版本存在安全漏洞，该漏洞源于KVM s390 PCI未拒绝已启用中断转发的重复注册请求，可能导致资源覆盖和泄漏。

CVSS 8.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc< 642d2d1067f7c4d753ae0e3ba5bc98b43cfe3c70 affected
3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc< 78d9648e7e960546d5b72504a0b0358cd8bb1e9d affected
3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc< 6be1ff49ba81f96a6fa55915e6d920be43ac57cc affected
3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc< 6837f0ae85fd54cf64c8a0c7c530bba2fae0a207 affected
3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc< 591952b63a9f976da7d49f719f36ec826ee2a575 affected
3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc< 8fa01be5a6149404adb82c0979a78f6347edd3ef affected
6.0 affected
< 6.0 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-74515

Vulnerability Information
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Vulnerability Title
KVM: s390: pci: Reject adapter interrupt forwarding if already enabled
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled The MPCIFC instruction doesn't allow registering adapter interrupts without first unregistering. So reject any request to enable interrupt forwarding if its already enabled for the zPCI device. This also fixes overwriting and thus leaking resources when the ioctl is called multiple times for the same device.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 6.0版本至7.2-rc6之前版本存在安全漏洞，该漏洞源于KVM s390 PCI未拒绝已启用中断转发的重复注册请求，可能导致资源覆盖和泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc ~ 642d2d1067f7c4d753ae0e3ba5bc98b43cfe3c70 -
Linux Linux 6.0 -

II. Public POCs for CVE-2026-74515

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III. Intelligence Information for CVE-2026-74515

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Patches & Fixes for CVE-2026-74515 (6)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72084 9.8 CRITICAL scsi: target: Bound PR-OUT TransportID parsing to the received buffer
CVE-2026-72249 9.8 CRITICAL netfilter: flowtable: use dst in this direction when pushing IPIP header
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-72220 9.8 CRITICAL sunrpc: harden rq_procinfo lifecycle to prevent double-free
CVE-2026-72494 9.8 CRITICAL RDMA/irdma: Replace waitqueue and flag with completion
CVE-2026-74345 9.8 CRITICAL RDMA/siw: Fix endpoint/socket association handling
CVE-2026-74255 9.8 CRITICAL tipc: fix UAF in tipc_l2_send_msg()
CVE-2026-72221 9.8 CRITICAL sunrpc: wait for in-flight TLS handshake callback when cancel loses race
CVE-2026-72226 9.8 CRITICAL batman-adv: tt: prevent TVLV OOB check overflow
CVE-2026-74428 9.8 CRITICAL rxrpc: Fix double unlock in rxrpc_recvmsg()
CVE-2026-72083 9.8 CRITICAL scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE
CVE-2026-72234 9.8 CRITICAL batman-adv: access unicast_ttvn skb->data only after skb realloc

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74515

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