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CVE-2026-43343— usb: gadget: f_subset: Fix unbalanced refcnt in geth_free

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于USB gadget f_subset中geth_free函数未递减引用计数，导致卸载函数后无法通过configfs配置属性。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 02832e56f88a981474ee4c7c141f46fc1b4454f4< a932b171554714b1bca313b853c7aa9f2930f9aa affected
02832e56f88a981474ee4c7c141f46fc1b4454f4< d7d702407b61e96286a15b6e715572f541a8d41c affected
02832e56f88a981474ee4c7c141f46fc1b4454f4< 3f5bfc550a40d7493b1cf09540ed6b412b3b82be affected
02832e56f88a981474ee4c7c141f46fc1b4454f4< 75776a055b656873319c3830fed471daef3ceb23 affected
02832e56f88a981474ee4c7c141f46fc1b4454f4< cc8ec610cd14c093a19371691a7ce1ee5421e829 affected
02832e56f88a981474ee4c7c141f46fc1b4454f4< 3d436670b47415da042452618fb5d8e317ab095f affected
02832e56f88a981474ee4c7c141f46fc1b4454f4< 23e4851ce348a329d974e84e828155dda9f52122 affected
02832e56f88a981474ee4c7c141f46fc1b4454f4< caa27923aacd8a5869207842f2ab1657c6c0c7bc affected
… +10 more rows
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I. Basic Information for CVE-2026-43343

Vulnerability Information
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Vulnerability Title
usb: gadget: f_subset: Fix unbalanced refcnt in geth_free
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_subset: Fix unbalanced refcnt in geth_free geth_alloc() increments the reference count, but geth_free() fails to decrement it. This prevents the configuration of attributes via configfs after unlinking the function. Decrement the reference count in geth_free() to ensure proper cleanup.
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于USB gadget f_subset中geth_free函数未递减引用计数，导致卸载函数后无法通过configfs配置属性。
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 02832e56f88a981474ee4c7c141f46fc1b4454f4 ~ a932b171554714b1bca313b853c7aa9f2930f9aa -
Linux Linux 3.11 -

II. Public POCs for CVE-2026-43343

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III. Intelligence Information for CVE-2026-43343

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Patches & Fixes for CVE-2026-43343 (8)

Same Patch Batch · Linux · 2026-05-08 · 197 CVEs total

CVE-2026-43341 9.8 CRITICAL net/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-43402 9.8 CRITICAL kthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-43414 9.8 CRITICAL scsi: qla2xxx: Completely fix fcport double free
CVE-2026-43384 9.8 CRITICAL net/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-43304 9.8 CRITICAL libceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-43379 9.8 CRITICAL ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-43376 9.8 CRITICAL ksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-43465 9.8 CRITICAL net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-43378 9.8 CRITICAL smb: server: fix use-after-free in smb2_open()
CVE-2026-43383 9.4 CRITICAL net/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-43406 9.1 CRITICAL libceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-43407 9.1 CRITICAL libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-43284 8.8 HIGH xfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-43334 8.8 HIGH Bluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-43322 8.8 HIGH Bluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-43403 8.8 HIGH nsfs: tighten permission checks for ns iteration ioctls
CVE-2026-43391 8.8 HIGH nsfs: tighten permission checks for handle opening
CVE-2026-43291 8.3 HIGH net: nfc: nci: Fix parameter validation for packet data
CVE-2026-43365 8.2 HIGH xfs: fix undersized l_iclog_roundoff values
CVE-2026-43466 8.2 HIGH net/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery

Showing top 20 of 197 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43343

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