Withdrawn: this CVE is not a vulnerability
The assigning CNA withdrew CVE-2026-43423 on 17 June 2026, and it carries the Rejected state at CVE.org and NVD. It must not be treated as a live finding. Its pre-withdrawal severity, score and exploitability are withheld below; the record itself is kept because withdrawals are reversible and because the reject reason is the correction worth publishing.
WITHDRAWN
CVE-2026-43423
usb: gadget: f_ncm: Fix atomic context locking issue
Overview
Description
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
Details
INFO
Published Date :
May 8, 2026, 3:16 p.m.
Last Modified :
June 17, 2026, 7:17 p.m.
Remotely Exploit :
—
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
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-2026-43423 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43423 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.
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CVE Rejected by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 17, 2026
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 17, 2026
Action Type Old Value New Value Changed Description In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: Fix atomic context locking issue The ncm_set_alt function was holding a mutex to protect against races with configfs, which invokes the might-sleep function inside an atomic context. Remove the struct net_device pointer from the f_ncm_opts structure to eliminate the contention. The connection state is now managed by a new boolean flag to preserve the use-after-free fix from commit 6334b8e4553c ("usb: gadget: f_ncm: Fix UAF ncm object at re-bind after usb ep transport error"). BUG: sleeping function called from invalid context Call Trace: dump_stack_lvl+0x83/0xc0 dump_stack+0x14/0x16 __might_resched+0x389/0x4c0 __might_sleep+0x8e/0x100 ... __mutex_lock+0x6f/0x1740 ... ncm_set_alt+0x209/0xa40 set_config+0x6b6/0xb40 composite_setup+0x734/0x2b40 ... Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority. Removed CVSS V3.1 NIST: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Removed CWE NIST: CWE-667 Removed CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.18.17 up to (excluding) 6.18.19 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19.7 up to (excluding) 6.19.9 Removed Reference kernel.org: https://git.kernel.org/stable/c/0d6c8144ca4d93253de952a5ea0028c19ed7ab68 Removed Reference kernel.org: https://git.kernel.org/stable/c/e533a44fb1b337d14f772585b67328bee2e0b5e3 Removed Reference kernel.org: https://git.kernel.org/stable/c/e95120b4b95ef1c16d8e94e201ae89f5e59e2612 Removed Reference Type kernel.org: https://git.kernel.org/stable/c/0d6c8144ca4d93253de952a5ea0028c19ed7ab68 Types: Patch Removed Reference Type kernel.org: https://git.kernel.org/stable/c/e533a44fb1b337d14f772585b67328bee2e0b5e3 Types: Patch Removed Reference Type kernel.org: https://git.kernel.org/stable/c/e95120b4b95ef1c16d8e94e201ae89f5e59e2612 Types: Patch Removed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'b62076e780a2121903ecf9ffdfb89c64647cb7da', 'lessThan': 'e533a44fb1b337d14f772585b67328bee2e0b5e3', 'versionType': 'git'}, {'status': 'affected', 'version': '188338c1827842f898761a939669cf345bdf07e2', 'lessThan': 'e95120b4b95ef1c16d8e94e201ae89f5e59e2612', 'versionType': 'git'}, {'status': 'affected', 'version': '56a512a9b4107079f68701e7d55da8507eb963d9', 'lessThan': '0d6c8144ca4d93253de952a5ea0028c19ed7ab68', 'versionType': 'git'}], 'programFiles': ['drivers/usb/gadget/function/f_ncm.c', 'drivers/usb/gadget/function/u_ether_configfs.h', 'drivers/usb/gadget/function/u_ncm.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.18.17', 'lessThan': '6.18.19', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.19.7', 'lessThan': '6.19.9', 'versionType': 'semver'}], 'programFiles': ['drivers/usb/gadget/function/f_ncm.c', 'drivers/usb/gadget/function/u_ether_configfs.h', 'drivers/usb/gadget/function/u_ncm.h'], 'defaultStatus': 'unaffected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 17, 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': 'b62076e780a2121903ecf9ffdfb89c64647cb7da', 'lessThan': 'e533a44fb1b337d14f772585b67328bee2e0b5e3', 'versionType': 'git'}, {'status': 'affected', 'version': '188338c1827842f898761a939669cf345bdf07e2', 'lessThan': 'e95120b4b95ef1c16d8e94e201ae89f5e59e2612', 'versionType': 'git'}, {'status': 'affected', 'version': '56a512a9b4107079f68701e7d55da8507eb963d9', 'lessThan': '0d6c8144ca4d93253de952a5ea0028c19ed7ab68', 'versionType': 'git'}], 'programFiles': ['drivers/usb/gadget/function/f_ncm.c', 'drivers/usb/gadget/function/u_ether_configfs.h', 'drivers/usb/gadget/function/u_ncm.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.18.17', 'lessThan': '6.18.19', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.19.7', 'lessThan': '6.19.9', 'versionType': 'semver'}], 'programFiles': ['drivers/usb/gadget/function/f_ncm.c', 'drivers/usb/gadget/function/u_ether_configfs.h', 'drivers/usb/gadget/function/u_ncm.h'], 'defaultStatus': 'unaffected'}] -
Initial Analysis by [email protected]
May. 22, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-667 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.18.17 up to (excluding) 6.18.19 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19.7 up to (excluding) 6.19.9 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0d6c8144ca4d93253de952a5ea0028c19ed7ab68 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e533a44fb1b337d14f772585b67328bee2e0b5e3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e95120b4b95ef1c16d8e94e201ae89f5e59e2612 Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 08, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: Fix atomic context locking issue The ncm_set_alt function was holding a mutex to protect against races with configfs, which invokes the might-sleep function inside an atomic context. Remove the struct net_device pointer from the f_ncm_opts structure to eliminate the contention. The connection state is now managed by a new boolean flag to preserve the use-after-free fix from commit 6334b8e4553c ("usb: gadget: f_ncm: Fix UAF ncm object at re-bind after usb ep transport error"). BUG: sleeping function called from invalid context Call Trace: dump_stack_lvl+0x83/0xc0 dump_stack+0x14/0x16 __might_resched+0x389/0x4c0 __might_sleep+0x8e/0x100 ... __mutex_lock+0x6f/0x1740 ... ncm_set_alt+0x209/0xa40 set_config+0x6b6/0xb40 composite_setup+0x734/0x2b40 ... Added Reference https://git.kernel.org/stable/c/0d6c8144ca4d93253de952a5ea0028c19ed7ab68 Added Reference https://git.kernel.org/stable/c/e533a44fb1b337d14f772585b67328bee2e0b5e3 Added Reference https://git.kernel.org/stable/c/e95120b4b95ef1c16d8e94e201ae89f5e59e2612
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.