ghsa-22j6-v8cr-pvvx
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
locking/csd_lock: Change csdlock_debug from early_param to __setup
The csdlock_debug kernel-boot parameter is parsed by the early_param() function csdlock_debug(). If set, csdlock_debug() invokes static_branch_enable() to enable csd_lock_wait feature, which triggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and CONFIG_SPARSEMEM_VMEMMAP=n.
With CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in static_key_enable() and returns NULL, resulting in a NULL dereference because mem_section is initialized only later in sparse_init().
This is also a problem for powerpc because early_param() functions are invoked earlier than jump_label_init(), also resulting in static_key_enable() failures. These failures cause the warning "static key 'xxx' used before call to jump_label_init()".
Thus, early_param is too early for csd_lock_wait to run static_branch_enable(), so changes it to __setup to fix these.
{
"affected": [],
"aliases": [
"CVE-2022-50091"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T11:15:38Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/csd_lock: Change csdlock_debug from early_param to __setup\n\nThe csdlock_debug kernel-boot parameter is parsed by the\nearly_param() function csdlock_debug(). If set, csdlock_debug()\ninvokes static_branch_enable() to enable csd_lock_wait feature, which\ntriggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and\nCONFIG_SPARSEMEM_VMEMMAP=n.\n\nWith CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in\nstatic_key_enable() and returns NULL, resulting in a NULL dereference\nbecause mem_section is initialized only later in sparse_init().\n\nThis is also a problem for powerpc because early_param() functions\nare invoked earlier than jump_label_init(), also resulting in\nstatic_key_enable() failures. These failures cause the warning \"static\nkey \u0027xxx\u0027 used before call to jump_label_init()\".\n\nThus, early_param is too early for csd_lock_wait to run\nstatic_branch_enable(), so changes it to __setup to fix these.",
"id": "GHSA-22j6-v8cr-pvvx",
"modified": "2025-06-18T12:30:47Z",
"published": "2025-06-18T12:30:47Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50091"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/05de9e2e33b1625c71aee69e353fe906dd2be88a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9c9b26b0df270d4f9246e483a44686fca951a29c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d2cbdbe22b5f190055d2d0ae92e7454479343a30"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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