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CVE-2026-80923— xhci: dbgtty: Fix unregister on tty_register_driver() 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.

在 Linux 内核中，以下漏洞已得到修复： xhci: dbgtty: 修复 tty_register_driver() 失败时的反注册逻辑 当 调用失败时，代码会释放该驱动对象（drop the reference），但未能将全局变量 置为 NULL，导致在模块卸载时再次调用反注册操作。 具体而言，模块卸载时， 仅根据驱动指针是否非 NULL 来决定是否执行清理逻辑，因此会在一个已经释放的驱动对象上操作：

AI Predicted 3.1 Difficulty: Hard

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4521f16139409cdf9462c7325d43454462cff6c3< 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3 affected
4521f16139409cdf9462c7325d43454462cff6c3< 43635ff6401ca0e0ed21875379eeded921321525 affected
4521f16139409cdf9462c7325d43454462cff6c3< eaca2814f32b9872a332326324b9e83e01f156d2 affected
4521f16139409cdf9462c7325d43454462cff6c3< 943f976c93e70563b132f5585ff68b08c89641a2 affected
4521f16139409cdf9462c7325d43454462cff6c3< 0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922 affected
4521f16139409cdf9462c7325d43454462cff6c3< 33ed35ca629477f57e0dd1d77d6df96cf5a9eb55 affected
4521f16139409cdf9462c7325d43454462cff6c3< 0e469b94fbba8eb03666da41dd1082b793c50c1a affected
4521f16139409cdf9462c7325d43454462cff6c3< a916fa66a43e10f63198b6ce978badffc678821a affected
… +10 more rows
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I. Basic Information for CVE-2026-80923

Vulnerability Information
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Vulnerability Title
xhci: dbgtty: Fix unregister on tty_register_driver() failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xhci: dbgtty: Fix unregister on tty_register_driver() failure If tty_register_driver() fails, it drops the reference, but fails to set the global dbc_tty_driver to NULL, causing the unregister to be called again when module exits. On module unload dbc_tty_exit() only gates its cleanup on the driver pointer being non-NULL, so it operates on the already-freed driver: module_init(xhci_hcd_init) xhci_hcd_init() xhci_dbc_init() [return value ignored] dbc_tty_init() tty_register_driver() fails tty_driver_kref_put() -> driver freed (dbc_tty_driver left dangling) ... module_exit(xhci_hcd_fini) xhci_hcd_fini() xhci_dbc_exit() dbc_tty_exit() if (dbc_tty_driver) -> true (dangling) tty_unregister_driver() -> use-after-free
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4521f16139409cdf9462c7325d43454462cff6c3 ~ 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3 -
Linux Linux 5.9 -

II. Public POCs for CVE-2026-80923

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III. Intelligence Information for CVE-2026-80923

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Patches & Fixes for CVE-2026-80923 (7)

Other References for CVE-2026-80923 (1)

Same Patch Batch · Linux · 2026-09-09 · 12 CVEs total

CVE-2026-80925 vlan: fix skb_under_panic and races when toggling HW VLAN offload
CVE-2026-80924 crypto: krb5 - use kfree_sensitive() for derived key buffers
CVE-2026-80922 crypto: qcom-rng - Allow zero as a random number
CVE-2026-80921 KVM: s390: vsie: zero stale crypto bits
CVE-2026-80920 io_uring: defer eventfd signaling when queued from a wakeup handler
CVE-2026-80919 drm/amdgpu: fix recursive ww_mutex acquire in amdgpu_devcoredump_format
CVE-2026-80918 HID: core: fix number/pointer type confusion on long items
CVE-2026-80917 PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems
CVE-2026-80916 kcov: fix data corruption and race conditions on PREEMPT_RT
CVE-2026-80915 drm/xe: Fix DPT allocation paths.
CVE-2026-80914 Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80923

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