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CVE-2026-89733— usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()

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，已修复以下漏洞： usb: gadget: uvc: 修复 和 中的悬垂指针问题 在 的错误处理路径中，我们调用了 ，该函数会使用 ，但随后并未将其设置为 NULL。因此， 成为一个悬垂指针，可能导致释放后使用（Use-After-Free, UAF）问题。此外，在释放 后，也未将其指针置为 NULL，这构成了另一个悬垂指针。 修复方式：在调用 之后，将 设置为 NULL；在执行 释放 之后，也将其设置为 NULL。对 执行相同的修复操作。

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 0f9df939385527049c8062a099fbfa1479fe7ce0< 8e88ed8a374de67270d38689f2a81018909cafbb affected
0f9df939385527049c8062a099fbfa1479fe7ce0< 9897b7da8c0ad8356c1b8649379fcb5a689462cb affected
0f9df939385527049c8062a099fbfa1479fe7ce0< 38f822ddce9355893d734279a26ddec45182197e affected
0f9df939385527049c8062a099fbfa1479fe7ce0< bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc affected
1efa8a5aac93d9e67075995d7d4902b57ce184f7 affected
e7a4b0efe62e56a0acc81d16091c6efc2a282be8 affected
065f5561a20659cf17aae5f72b32b5c2695c8e00 affected
3.2.36< 3.3 affected
… +8 more rows
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I. Basic Information for CVE-2026-89733

Vulnerability Information
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Vulnerability Title
usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind().
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 0f9df939385527049c8062a099fbfa1479fe7ce0 ~ 8e88ed8a374de67270d38689f2a81018909cafbb -
Linux Linux 3.8 -

II. Public POCs for CVE-2026-89733

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III. Intelligence Information for CVE-2026-89733

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Patches & Fixes for CVE-2026-89733 (4)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89477 sctp: fix NULL deref on untransmitted RECONF completion
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89480 nvme-tcp: reject a read that transferred too few bytes
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89496 ocfs2: always run deallocs on copy-on-write completion
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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