CVE-2026-64331
usbip: vudc: fix NULL deref in vep_dequeue()
Description
In the Linux kernel, the following vulnerability has been resolved: usbip: vudc: fix NULL deref in vep_dequeue() vep_alloc_request() wasn't initializing vrequest->udc, so cancellations on the FunctionFS AIO path were arriving in vep_dequeue without a valid UDC reference. Since vrequest->udc is never actually properly used anywhere, we opt to remove it, and update vep_dequeue to obtain a reference to the udc with ep_to_vudc(), consistent with the other vep_ ops. AFAICT this bug has existed for ~10 years. Seems that nobody has really stressed the FunctionFS AIO path on usbip's vudc. I tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints via AIO. Before the fix, running `usbip attach` from the host would cause the guest to oops with the following backtrace: Call trace: vep_dequeue+0x1c/0xe4 (P) usb_ep_dequeue+0x14/0x20 ffs_aio_cancel+0x24/0x34 __arm64_sys_io_cancel+0xb0/0x124 do_el0_svc+0x68/0x100 el0_svc+0x18/0x5c el0t_64_sync_handler+0x98/0xdc el0t_64_sync+0x154/0x158
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to the latest version.
- Apply the specific patch for the usbip vulnerability.
- Recompile the kernel if necessary.
- Reboot the system after updating.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64331.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64331 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64331
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64331 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64331 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '9858c91d9ee6a13c45311569039413729fc9b757', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '1226293ec9bed3d4cc5b05eeeb811d315ca51652', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '3750f75f29f99c0223601e2ee73ad084adec47bd', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': 'd0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '0025276175fbbe0dcbf3f84d090b0adee769e9d9', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '347b59e9f96719d89b6ef555d02a18ada1a5846f', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '0443e4416aa1ee97748d1ed904eaf3352c60045e', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': 'c5371e0b91b24159a3ebaa61e70b0980bcf03c0a', 'versionType': 'git'}], 'programFiles': ['drivers/usb/usbip/vudc.h', 'drivers/usb/usbip/vudc_dev.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.7'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.7', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/usbip/vudc.h', 'drivers/usb/usbip/vudc_dev.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '9858c91d9ee6a13c45311569039413729fc9b757', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '1226293ec9bed3d4cc5b05eeeb811d315ca51652', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '3750f75f29f99c0223601e2ee73ad084adec47bd', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': 'd0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '0025276175fbbe0dcbf3f84d090b0adee769e9d9', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '347b59e9f96719d89b6ef555d02a18ada1a5846f', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '0443e4416aa1ee97748d1ed904eaf3352c60045e', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': 'c5371e0b91b24159a3ebaa61e70b0980bcf03c0a', 'versionType': 'git'}], 'programFiles': ['drivers/usb/usbip/vudc.h', 'drivers/usb/usbip/vudc_dev.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.7'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.7', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/usbip/vudc.h', 'drivers/usb/usbip/vudc_dev.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '9858c91d9ee6a13c45311569039413729fc9b757', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '1226293ec9bed3d4cc5b05eeeb811d315ca51652', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '3750f75f29f99c0223601e2ee73ad084adec47bd', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': 'd0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '0025276175fbbe0dcbf3f84d090b0adee769e9d9', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '347b59e9f96719d89b6ef555d02a18ada1a5846f', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': '0443e4416aa1ee97748d1ed904eaf3352c60045e', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6a0ca11186759ad7045d68a5447b1e89f658384', 'lessThan': 'c5371e0b91b24159a3ebaa61e70b0980bcf03c0a', 'versionType': 'git'}], 'programFiles': ['drivers/usb/usbip/vudc.h', 'drivers/usb/usbip/vudc_dev.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.7'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.7', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/usbip/vudc.h', 'drivers/usb/usbip/vudc_dev.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: usbip: vudc: fix NULL deref in vep_dequeue() vep_alloc_request() wasn't initializing vrequest->udc, so cancellations on the FunctionFS AIO path were arriving in vep_dequeue without a valid UDC reference. Since vrequest->udc is never actually properly used anywhere, we opt to remove it, and update vep_dequeue to obtain a reference to the udc with ep_to_vudc(), consistent with the other vep_ ops. AFAICT this bug has existed for ~10 years. Seems that nobody has really stressed the FunctionFS AIO path on usbip's vudc. I tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints via AIO. Before the fix, running `usbip attach` from the host would cause the guest to oops with the following backtrace: Call trace: vep_dequeue+0x1c/0xe4 (P) usb_ep_dequeue+0x14/0x20 ffs_aio_cancel+0x24/0x34 __arm64_sys_io_cancel+0xb0/0x124 do_el0_svc+0x68/0x100 el0_svc+0x18/0x5c el0t_64_sync_handler+0x98/0xdc el0t_64_sync+0x154/0x158 Added Reference https://git.kernel.org/stable/c/0025276175fbbe0dcbf3f84d090b0adee769e9d9 Added Reference https://git.kernel.org/stable/c/0443e4416aa1ee97748d1ed904eaf3352c60045e Added Reference https://git.kernel.org/stable/c/1226293ec9bed3d4cc5b05eeeb811d315ca51652 Added Reference https://git.kernel.org/stable/c/347b59e9f96719d89b6ef555d02a18ada1a5846f Added Reference https://git.kernel.org/stable/c/3750f75f29f99c0223601e2ee73ad084adec47bd Added Reference https://git.kernel.org/stable/c/9858c91d9ee6a13c45311569039413729fc9b757 Added Reference https://git.kernel.org/stable/c/c5371e0b91b24159a3ebaa61e70b0980bcf03c0a Added Reference https://git.kernel.org/stable/c/d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97