CVE-2022-50091 (GCVE-0-2022-50091)
Vulnerability from cvelistv5 – Published: 2025-06-18 11:02 – Updated: 2026-05-11 19:12
VLAI
EPSS
VEX
Title
locking/csd_lock: Change csdlock_debug from early_param to __setup
Summary
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.
Severity
5.5 (Medium)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 , < d2cbdbe22b5f190055d2d0ae92e7454479343a30
(git)
Affected: 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 , < 05de9e2e33b1625c71aee69e353fe906dd2be88a (git) Affected: 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 , < b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0 (git) Affected: 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 , < 9c9b26b0df270d4f9246e483a44686fca951a29c (git) |
guessed | |
| Linux | Linux |
Affected:
5.13
Unaffected: 0 , < 5.13 (semver) Unaffected: 5.15.61 , ≤ 5.15.* (semver) Unaffected: 5.18.18 , ≤ 5.18.* (semver) Unaffected: 5.19.2 , ≤ 5.19.* (semver) Unaffected: 6.0 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "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."
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"confidentialityImpact": "NONE",
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"id": "CVE-2022-50091",
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: locking/csd_lock: Change csdlock_debug from early_param to __setup",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50091.json",
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"current_release_date": "2026-08-29T02:23:22Z",
"cve": "CVE-2022-50091",
"id": "CVE-2022-50091",
"initial_release_date": "2025-06-19T03:42:10Z",
"product_status:known_affected": "455",
"product_status:known_not_affected": "390",
"product_status:recommended": "119",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2022-50091",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50091.json",
"version": "37"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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