Answer in brief
CVE-2022-50091 records a Medium severity (CVSS 5.5) vulnerability in locking/csd_lock: Change csdlock_debug from early_param to __setup. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 <d2cbdbe22b5f190055d2d0ae92e7454479343a30 || >=8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 <05de9e2e33b1625c71aee69e353fe906dd2be88a || >=8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 <b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0 || >=8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 <9c9b26b0df270d4f9246e483a44686fca951a29c | d2cbdbe22b5f190055d2d0ae92e7454479343a30, 05de9e2e33b1625c71aee69e353fe906dd2be88a, b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0, 9c9b26b0df270d4f9246e483a44686fca951a29c |
| Linux/Linuxgeneric | 5.13 | Not reported |
Published upstream
Jun 18, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.