GHSA-RJR7-C4CW-33W8
Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-08 15:31In 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 ...
{
"affected": [],
"aliases": [
"CVE-2026-43423"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-08T15:16:54Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_ncm: Fix atomic context locking issue\n\nThe ncm_set_alt function was holding a mutex to protect against races\nwith configfs, which invokes the might-sleep function inside an atomic\ncontext.\n\nRemove the struct net_device pointer from the f_ncm_opts structure to\neliminate the contention. The connection state is now managed by a new\nboolean flag to preserve the use-after-free fix from\ncommit 6334b8e4553c (\"usb: gadget: f_ncm: Fix UAF ncm object at re-bind\nafter usb ep transport error\").\n\nBUG: sleeping function called from invalid context\nCall Trace:\n dump_stack_lvl+0x83/0xc0\n dump_stack+0x14/0x16\n __might_resched+0x389/0x4c0\n __might_sleep+0x8e/0x100\n ...\n __mutex_lock+0x6f/0x1740\n ...\n ncm_set_alt+0x209/0xa40\n set_config+0x6b6/0xb40\n composite_setup+0x734/0x2b40\n ...",
"id": "GHSA-rjr7-c4cw-33w8",
"modified": "2026-05-08T15:31:28Z",
"published": "2026-05-08T15:31:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43423"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0d6c8144ca4d93253de952a5ea0028c19ed7ab68"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e533a44fb1b337d14f772585b67328bee2e0b5e3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e95120b4b95ef1c16d8e94e201ae89f5e59e2612"
}
],
"schema_version": "1.4.0",
"severity": []
}
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