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CVE-2026-80821— nvmet: pci-epf: put CQ ref on create_cq mapping failure

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 6.14版本存在安全漏洞，该漏洞源于nvmet_pci_epf_create_cq()在PCI地址空间映射失败时未释放CQ引用，可能导致CQ和控制器引用泄漏。

AI Predicted 7.0 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1598 · Phishing for Information

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186< f31650243c1ab32394077f234685e89ed8dece84 affected
0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186< b5f97fae2503a763fa0f953abf5f121b0fef7d0d affected
0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186< 56a7b6a6880dbabe28214ff88df8d229ca3a944a affected
0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186< 659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c affected
6.14 affected
< 6.14 unaffected
6.18.47≤ 6.18.* unaffected
7.1.11≤ 7.1.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-80821

Vulnerability Information
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Vulnerability Title
nvmet: pci-epf: put CQ ref on create_cq mapping failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nvmet: pci-epf: put CQ ref on create_cq mapping failure nvmet_pci_epf_create_cq() calls nvmet_cq_create(), which takes a reference on the controller and installs the completion queue. If the subsequent PCI address-space mapping fails or returns a too-small partial mapping, the function jumps to err_internal / err_unmap_queue without calling nvmet_cq_put(). The matching put in nvmet_pci_epf_delete_cq() is gated on NVMET_PCI_EPF_Q_LIVE, which is only set after the mapping succeeds, so teardown never releases these references. A remote PCI host that drives Create IO CQ commands with a failing PRP1/pci_addr therefore leaks the CQ and a controller reference on each attempt. Drop the CQ reference on the mapping-failure paths. The err_internal and err_unmap_queue labels are only reachable after nvmet_cq_create() has succeeded, so this pairs the create/put correctly.
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
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 6.14版本存在安全漏洞，该漏洞源于nvmet_pci_epf_create_cq()在PCI地址空间映射失败时未释放CQ引用，可能导致CQ和控制器引用泄漏。
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 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 ~ f31650243c1ab32394077f234685e89ed8dece84 -
Linux Linux 6.14 -

II. Public POCs for CVE-2026-80821

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III. Intelligence Information for CVE-2026-80821

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Patches & Fixes for CVE-2026-80821 (4)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80874 arm64: dts: renesas: ironhide: Describe inline ECC carveouts
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80821

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