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.
References
Configurations
Configuration 1 (hide)
|
History
18 Nov 2025, 02:11
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CWE | CWE-476 | |
| References | () https://git.kernel.org/stable/c/05de9e2e33b1625c71aee69e353fe906dd2be88a - Patch | |
| References | () https://git.kernel.org/stable/c/9c9b26b0df270d4f9246e483a44686fca951a29c - Patch | |
| References | () https://git.kernel.org/stable/c/b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0 - Patch | |
| References | () https://git.kernel.org/stable/c/d2cbdbe22b5f190055d2d0ae92e7454479343a30 - Patch | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| First Time |
Linux linux Kernel
Linux |
Information
Published : 2025-06-18 11:15
Updated : 2025-11-18 02:11
NVD link : CVE-2022-50091
Mitre link : CVE-2022-50091
CVE.ORG link : CVE-2022-50091
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference