CVE-2022-49905 (GCVE-0-2022-49905)
Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2026-08-05 08:56
VLAI
EPSS
VEX
Title
net/smc: Fix possible leaked pernet namespace in smc_init()
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/smc: Fix possible leaked pernet namespace in smc_init()
In smc_init(), register_pernet_subsys(&smc_net_stat_ops) is called
without any error handling.
If it fails, registering of &smc_net_ops won't be reverted.
And if smc_nl_init() fails, &smc_net_stat_ops itself won't be reverted.
This leaves wild ops in subsystem linkedlist and when another module
tries to call register_pernet_operations() it triggers page fault:
BUG: unable to handle page fault for address: fffffbfff81b964c
RIP: 0010:register_pernet_operations+0x1b9/0x5f0
Call Trace:
<TASK>
register_pernet_subsys+0x29/0x40
ebtables_init+0x58/0x1000 [ebtables]
...
Severity
7.8 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
194730a9beb52d2b030ea45e12d94868d4a0e6fd , < 61defd6450a9ef4a1487090449999b0fd83518ef
(git)
Affected: 194730a9beb52d2b030ea45e12d94868d4a0e6fd , < c97daf836f7caf81d3144b8cd2b2a51f9bc3bd09 (git) Affected: 194730a9beb52d2b030ea45e12d94868d4a0e6fd , < 62ff373da2534534c55debe6c724c7fe14adb97f (git) |
guessed | |
| Linux | Linux |
Affected:
5.14
Unaffected: 0 , < 5.14 (semver) Unaffected: 5.15.78 , ≤ 5.15.* (semver) Unaffected: 6.0.8 , ≤ 6.0.* (semver) Unaffected: 6.1 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "AV:L - The bug is in smc_init() module/subsystem initialization and is reached via local actions such as socket(AF_SMC) module autoload (net-pf-43) or TCP_ULP \"smc\", not by processing remote packets.\nAC:L - An unprivileged local attacker can induce smc_init() failure (e.g., memory pressure on the many GFP_KERNEL allocations and registrations in the init path) and then trigger the dangling ops via netns creation or another pernet registration, without relying on conditions outside their control.\nPR:L - No CAP_SYS_MODULE is required: an unprivileged user can request_module via AF_SMC socket creation, and can create network namespaces through user namespaces to exercise the leaked pernet ops.\nUI:N - Exploitation requires no victim interaction; the attacker triggers module autoload and subsequent pernet list use themselves.\nS:U - Impact is confined to the host kernel authority (oops or privilege escalation within the same kernel); it does not cross a VM/host or other security boundary.\nC:H - Failed modular init frees the module while smc_net_ops or smc_net_stat_ops remain linked, yielding a use-after-free of pernet_operations (including function pointers) that can be reclaimed/sprayed for arbitrary kernel read primitives.\nI:H - The same dangling pernet_operations-\u003einit/exit pointers are invoked from setup_net()/register_pernet_operations(), so controlling the freed object enables arbitrary write and control-flow hijacking.\nA:H - The issue produces a kernel page fault/oops when another subsystem walks the corrupted pernet list (as shown with ebtables_init), which is a full availability impact."
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: Fix possible leaked pernet namespace in smc_init()\n\nIn smc_init(), register_pernet_subsys(\u0026smc_net_stat_ops) is called\nwithout any error handling.\nIf it fails, registering of \u0026smc_net_ops won\u0027t be reverted.\nAnd if smc_nl_init() fails, \u0026smc_net_stat_ops itself won\u0027t be reverted.\n\nThis leaves wild ops in subsystem linkedlist and when another module\ntries to call register_pernet_operations() it triggers page fault:\n\nBUG: unable to handle page fault for address: fffffbfff81b964c\nRIP: 0010:register_pernet_operations+0x1b9/0x5f0\nCall Trace:\n \u003cTASK\u003e\n register_pernet_subsys+0x29/0x40\n ebtables_init+0x58/0x1000 [ebtables]\n ..."
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"current_release_date": "2026-08-04T19:42:28+00:00",
"cve": "CVE-2022-49905",
"id": "CVE-2022-49905",
"initial_release_date": "2022-01-01T00:00:00+00:00",
"product_status:known_affected": "156",
"product_status:known_not_affected": "118",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net/smc: Fix possible leaked pernet namespace in smc_init()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49905.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-03T00:38:15Z",
"cve": "CVE-2022-49905",
"id": "CVE-2022-49905",
"initial_release_date": "2025-05-09T04:54:19Z",
"product_status:known_affected": "339",
"product_status:known_not_affected": "386",
"product_status:recommended": "214",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2022-49905",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49905.json",
"version": "42"
}
}
}
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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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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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