CVE-2022-50091
locking/csd_lock: Change csdlock_debug from early_param to __setup
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
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.
Timeline
ID reserved
By Linux
Published
- 17 months later
· 17 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.25% · top 83% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 – < d2cbdbe22b5f190055d2d0ae92e7454479343a30
- affected 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 – < 05de9e2e33b1625c71aee69e353fe906dd2be88a
- affected 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 – < b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0
- affected 8d0968cc6b8ffd8496c2ebffdfdc801f949a85e5 – < 9c9b26b0df270d4f9246e483a44686fca951a29c
- affected 5.13
- unaffected < 5.13
- unaffected 5.15.61 – ≤ 5.15.*
- unaffected 5.18.18 – ≤ 5.18.*
- unaffected 5.19.2 – ≤ 5.19.*
- unaffected 6.0 – ≤ *
References (4)
- https://git.kernel.org/stable/c/d2cbdbe22b5f190055d2d0ae92e7454479343a30 (opens in a new tab)
- https://git.kernel.org/stable/c/05de9e2e33b1625c71aee69e353fe906dd2be88a (opens in a new tab)
- https://git.kernel.org/stable/c/b480d1e9a8c11ecc1c99dc01814b28e3103bd0a0 (opens in a new tab)
- https://git.kernel.org/stable/c/9c9b26b0df270d4f9246e483a44686fca951a29c (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-50091)Record last updated .