GHSA-MH76-8WXP-345H
Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-24 18:31In the Linux kernel, the following vulnerability has been resolved:
locking/lockdep: Fix NULL pointer dereference in __lock_set_class()
register_lock_class() can return NULL when the lock class pool is exhausted, graph_lock() fails, or key validation fails. However, __lock_set_class() uses the return value directly in pointer arithmetic without a NULL check:
class = register_lock_class(lock, subclass, 0); hlock->class_idx = class - lock_classes;
If class is NULL, this computes a wild offset that corrupts hlock->class_idx. The subsequent reacquire_held_locks() call will invoke hlock_class() with this corrupted index, leading to a NULL or out-of-bounds pointer dereference.
Add the missing NULL check, consistent with how __lock_acquire() already handles this case at the same call site.
{
"affected": [],
"aliases": [
"CVE-2026-93261"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-24T16:17:22Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/lockdep: Fix NULL pointer dereference in __lock_set_class()\n\nregister_lock_class() can return NULL when the lock class pool is\nexhausted, graph_lock() fails, or key validation fails. However,\n__lock_set_class() uses the return value directly in pointer arithmetic\nwithout a NULL check:\n\n class = register_lock_class(lock, subclass, 0);\n hlock-\u003eclass_idx = class - lock_classes;\n\nIf class is NULL, this computes a wild offset that corrupts\nhlock-\u003eclass_idx. The subsequent reacquire_held_locks() call will\ninvoke hlock_class() with this corrupted index, leading to a NULL or\nout-of-bounds pointer dereference.\n\nAdd the missing NULL check, consistent with how __lock_acquire() already\nhandles this case at the same call site.",
"id": "GHSA-mh76-8wxp-345h",
"modified": "2026-09-24T18:31:25Z",
"published": "2026-09-24T18:31:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93261"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5c3bff6cf26e6a54fbf8b893a879c32824d2d50d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7577e00b9ab506202b9f1a33de3cc8cc6413a4db"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9be10f49dfc2e4b472b3a5f346483b67374774b8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b2113dcd8238bf00ce37a34e67b29cf31d32a545"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e7c69c6695d84220847cca62a45e879e71e79e9d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f56e54fd24f05e9de528fcb77f6084f80c8066ce"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f6093ff67ea6e347574819ed23e96e0f82a25ffc"
}
],
"schema_version": "1.4.0",
"severity": []
}
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