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CVE-2026-80854— usb: gadget: f_tcm: keep port count until LUN teardown completes

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存在安全漏洞，该漏洞源于USB gadget f_tcm驱动中端口计数在LUN拆除完成前被递减，导致释放后重用，可能造成内核崩溃。

AI Predicted 7.1 Difficulty: Moderate EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1218.002 · Control Panel

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux c52661d60f636d17e26ad834457db333bd1df494< c494c5562ca69b61a82f566e3b87a445d2c28929 affected
c52661d60f636d17e26ad834457db333bd1df494< c1f359d9a5efed458946063de65ddbeaacc4f165 affected
c52661d60f636d17e26ad834457db333bd1df494< 178f59a0bccd3f66cdfa5184310f31a58b7257c4 affected
c52661d60f636d17e26ad834457db333bd1df494< ad6f0375d2e93a1d8c015463e5e92dfcb26e311b affected
c52661d60f636d17e26ad834457db333bd1df494< 2efbfd42441d3ef8137aff2d59e9835e1d5ae780 affected
c52661d60f636d17e26ad834457db333bd1df494< 85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95 affected
c52661d60f636d17e26ad834457db333bd1df494< bbd6aa311a9f4dd17822c7557451458d3d2e980b affected
c52661d60f636d17e26ad834457db333bd1df494< eaa96a8458f54d6cf0954242ab8b1df2a6fccafa affected
… +12 more rows
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I. Basic Information for CVE-2026-80854

Vulnerability Information
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Vulnerability Title
usb: gadget: f_tcm: keep port count until LUN teardown completes
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_tcm: keep port count until LUN teardown completes tcm_usbg_drop_nexus() permits session removal once tpg_port_count reaches zero. However, usbg_port_unlink() currently decrements that count from the fabric_pre_unlink() callback, before core_dev_del_lun() waits for active se_lun references to drain. If removal of the last LUN races a nexus removal, the latter can observe a zero port count and call target_remove_session(). This frees sess_cmd_map while an in-flight struct usbg_cmd, including its work item, can still be accessed. Overlapping the last-LUN unlink with nexus removal reproduces this lifetime violation as a DEBUG_OBJECTS "free active" warning for usbg_cmd_work, followed by a target-core BUG/Oops. The generic target-core unlink path has no callback after core_dev_del_lun() completes. Add an optional fabric_post_unlink() callback and use it for the f_tcm port count. The count now remains nonzero until core_dev_del_lun() has finished draining active LUN references, preventing nexus removal from freeing the session during command completion.
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存在安全漏洞，该漏洞源于USB gadget f_tcm驱动中端口计数在LUN拆除完成前被递减，导致释放后重用，可能造成内核崩溃。
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 c52661d60f636d17e26ad834457db333bd1df494 ~ c494c5562ca69b61a82f566e3b87a445d2c28929 -
Linux Linux 3.5 -

II. Public POCs for CVE-2026-80854

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III. Intelligence Information for CVE-2026-80854

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Patches & Fixes for CVE-2026-80854 (8)

Mailing List Discussions for CVE-2026-80854 (1)

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-2026-80854

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