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CVE-2026-74520— iommu/iommufd: Fix IOPF group ownership UAF

CVSS 8.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1AI

T1211 · Exploitation for Stealth

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux34765cbc679c59ea5d952d738d2d16bf4aadc497< 6da8f37419dd4c456f26fc203f04e000186f4b3daffected
34765cbc679c59ea5d952d738d2d16bf4aadc497< 4e74a369236424114b94cf6a9f5ff9e848b430b4affected
34765cbc679c59ea5d952d738d2d16bf4aadc497< 738e6f32e61d80b554e37015ecb7bc620b88001caffected
6.11affected
< 6.11unaffected
6.18.44≤ 6.18.*unaffected
7.1.8≤ 7.1.*unaffected
7.2≤ *unaffected
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I. Basic Information for CVE-2026-74520

Vulnerability Information
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Vulnerability Title
iommu/iommufd: Fix IOPF group ownership UAF
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: iommu/iommufd: Fix IOPF group ownership UAF iopf_group_alloc() links each last-page IOPF group into the generic IOPF pending list before invoking the domain fault handler. iommufd_fault_iopf_handler() also queued an accepted group in the IOMMUFD deliver list without removing it from the generic pending list. When detach or HWPT replacement drops the device's IOPF reference count to zero, an IOMMU driver may call iopf_queue_remove_device(). That function responds to and frees groups through the generic pending list without removing the same groups from IOMMUFD's deliver list or response xarray. A later read, response, or cleanup can then access the freed group and cause a UAF. Fix this by dequeuing an accepted group from the generic pending list before IOMMUFD queues it for userspace response. Make iopf_group_response() send a response regardless of pending-list membership, so the dequeued group can still be completed by IOMMUFD.
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 6.11版本存在安全漏洞，该漏洞源于IOPF组所有权管理问题，IOPF组在未从待处理列表移除的情况下被加入传递列表，可能导致释放后重用。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 34765cbc679c59ea5d952d738d2d16bf4aadc497 ~ 6da8f37419dd4c456f26fc203f04e000186f4b3d -
LinuxLinux 6.11 -

II. Public POCs for CVE-2026-74520

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III. Intelligence Information for CVE-2026-74520

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Patches & Fixes for CVE-2026-74520 (3)

Same Patch Batch · Linux · 2026-08-15 · 846 CVEs total

CVE-2026-7240710.0 CRITICALgeneve: validate inner network offset in geneve_gro_complete()
CVE-2026-7240810.0 CRITICALgeneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-7427910.0 CRITICALcrypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-7242110.0 CRITICALipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-7428010.0 CRITICALcrypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-7430910.0 CRITICALvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-7447510.0 CRITICALvxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-724939.9 CRITICALnet: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-722489.8 CRITICALnetfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-743949.8 CRITICALRDMA/srpt: fix integer overflow in immediate data length check
CVE-2026-724179.8 CRITICALnetfilter: flowtable: Validate iph->ihl in nf_flow_ip4_tunnel_proto()
CVE-2026-720699.8 CRITICALlocking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-724229.8 CRITICALksmbd: fix use-after-free of conn->preauth_info in concurrent SMB2 NEGOTIATE
CVE-2026-720659.8 CRITICALnet: mana: Validate the packet length reported by the NIC
CVE-2026-720649.8 CRITICALnet: mana: Sync page pool RX frags for CPU
CVE-2026-722519.8 CRITICALnetfilter: nf_nat_sip: reload possible stale data pointer
CVE-2026-724299.8 CRITICALipv6: ioam: fix type confusion of dst_entry
CVE-2026-720469.8 CRITICALgve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-722269.8 CRITICALbatman-adv: tt: prevent TVLV OOB check overflow
CVE-2026-724519.8 CRITICALxfrm: Fix xfrm state cache insertion race

Showing top 20 of 846 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74520

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