CVE-2022-50756 (GCVE-0-2022-50756)
Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2026-08-05 08:59
VLAI
EPSS
VEX
Title
nvme-pci: fix mempool alloc size
Summary
In the Linux kernel, the following vulnerability has been resolved:
nvme-pci: fix mempool alloc size
Convert the max size to bytes to match the units of the divisor that
calculates the worst-case number of PRP entries.
The result is used to determine how many PRP Lists are required. The
code was previously rounding this to 1 list, but we can require 2 in the
worst case. In that scenario, the driver would corrupt memory beyond the
size provided by the mempool.
While unlikely to occur (you'd need a 4MB in exactly 127 phys segments
on a queue that doesn't support SGLs), this memory corruption has been
observed by kfence.
Severity
7.8 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
943e942e6266f22babee5efeb00f8f672fbff5bd , < dfb6d54893d544151e7f480bc44cfe7823f5ad23
(git)
Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < 9141144b37f30e3e7fa024bcfa0a13011e546ba9 (git) Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < e1777b4286e526c58b4ee699344b0ad85aaf83a0 (git) Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < b1814724e0d7162bdf4799f2d565381bc2251c63 (git) Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < c89a529e823d51dd23c7ec0c047c7a454a428541 (git) |
guessed | |
| Linux | Linux |
Affected:
4.18
Unaffected: 0 , < 4.18 (semver) Unaffected: 5.10.163 , ≤ 5.10.* (semver) Unaffected: 5.15.87 , ≤ 5.15.* (semver) Unaffected: 6.0.17 , ≤ 6.0.* (semver) Unaffected: 6.1.3 , ≤ 6.1.* (semver) Unaffected: 6.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/nvme/host/pci.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "dfb6d54893d544151e7f480bc44cfe7823f5ad23",
"status": "affected",
"version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
"versionType": "git"
},
{
"lessThan": "9141144b37f30e3e7fa024bcfa0a13011e546ba9",
"status": "affected",
"version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
"versionType": "git"
},
{
"lessThan": "e1777b4286e526c58b4ee699344b0ad85aaf83a0",
"status": "affected",
"version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
"versionType": "git"
},
{
"lessThan": "b1814724e0d7162bdf4799f2d565381bc2251c63",
"status": "affected",
"version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
"versionType": "git"
},
{
"lessThan": "c89a529e823d51dd23c7ec0c047c7a454a428541",
"status": "affected",
"version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/nvme/host/pci.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.18"
},
{
"lessThan": "4.18",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.163",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.87",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.0.*",
"status": "unaffected",
"version": "6.0.17",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.163",
"versionStartIncluding": "4.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.87",
"versionStartIncluding": "4.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.0.17",
"versionStartIncluding": "4.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.3",
"versionStartIncluding": "4.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.2",
"versionStartIncluding": "4.18",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-pci: fix mempool alloc size\n\nConvert the max size to bytes to match the units of the divisor that\ncalculates the worst-case number of PRP entries.\n\nThe result is used to determine how many PRP Lists are required. The\ncode was previously rounding this to 1 list, but we can require 2 in the\nworst case. In that scenario, the driver would corrupt memory beyond the\nsize provided by the mempool.\n\nWhile unlikely to occur (you\u0027d need a 4MB in exactly 127 phys segments\non a queue that doesn\u0027t support SGLs), this memory corruption has been\nobserved by kfence."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable code is in the nvme-pci host driver and is reached only through local block I/O submission to an NVMe namespace, not by parsing network packets or remote NVMe fabrics protocols.\nAC:L - An attacker can reliably craft large O_DIRECT I/Os with a fragmented user buffer to produce ~2\u20134MB requests with a high phys-segment count, forcing the PRP path and the undersized mempool overflow without depending on a race or other uncontrolled state.\nPR:L - Any unprivileged local user who can write to a file on an NVMe-backed filesystem can submit the triggering I/O; raw block-device privileges or root capabilities are not required.\nUI:N - Exploitation requires only attacker-controlled I/O; no separate victim action such as mounting a volume or opening a malicious file is needed.\nS:U - This is a host-kernel heap corruption in the NVMe driver that can escalate privileges within the same OS security authority; it does not cross a VM, IOMMU, or other security boundary by itself.\nC:H - The bug is a heap out-of-bounds write of PRP list pointers past the iod mempool object, which is memory corruption that can be leveraged for arbitrary kernel read primitives under standard heap-exploitation techniques.\nI:H - Out-of-bounds writes into adjacent slab memory enable corruption of kernel objects and control-flow hijacking primitives, so integrity impact is high per OOB-write guidance.\nA:H - The same overflow can crash the kernel (observed under KFENCE) via slab corruption or guard-page faults, producing a full availability loss."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T08:59:42.355Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/dfb6d54893d544151e7f480bc44cfe7823f5ad23"
},
{
"url": "https://git.kernel.org/stable/c/9141144b37f30e3e7fa024bcfa0a13011e546ba9"
},
{
"url": "https://git.kernel.org/stable/c/e1777b4286e526c58b4ee699344b0ad85aaf83a0"
},
{
"url": "https://git.kernel.org/stable/c/b1814724e0d7162bdf4799f2d565381bc2251c63"
},
{
"url": "https://git.kernel.org/stable/c/c89a529e823d51dd23c7ec0c047c7a454a428541"
}
],
"title": "nvme-pci: fix mempool alloc size",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2022-50756",
"datePublished": "2025-12-24T13:05:49.635Z",
"dateReserved": "2025-12-24T13:02:21.545Z",
"dateUpdated": "2026-08-05T08:59:42.355Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2022-50756",
"date": "2026-09-16",
"epss": "0.00197",
"percentile": "0.09641"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2022-50756\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:02.353\",\"lastModified\":\"2026-08-04T10:18:23.647\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnvme-pci: fix mempool alloc size\\n\\nConvert the max size to bytes to match the units of the divisor that\\ncalculates the worst-case number of PRP entries.\\n\\nThe result is used to determine how many PRP Lists are required. The\\ncode was previously rounding this to 1 list, but we can require 2 in the\\nworst case. In that scenario, the driver would corrupt memory beyond the\\nsize provided by the mempool.\\n\\nWhile unlikely to occur (you\u0027d need a 4MB in exactly 127 phys segments\\non a queue that doesn\u0027t support SGLs), this memory corruption has been\\nobserved by kfence.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/nvme/host/pci.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"943e942e6266f22babee5efeb00f8f672fbff5bd\",\"lessThan\":\"dfb6d54893d544151e7f480bc44cfe7823f5ad23\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"943e942e6266f22babee5efeb00f8f672fbff5bd\",\"lessThan\":\"9141144b37f30e3e7fa024bcfa0a13011e546ba9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"943e942e6266f22babee5efeb00f8f672fbff5bd\",\"lessThan\":\"e1777b4286e526c58b4ee699344b0ad85aaf83a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"943e942e6266f22babee5efeb00f8f672fbff5bd\",\"lessThan\":\"b1814724e0d7162bdf4799f2d565381bc2251c63\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"943e942e6266f22babee5efeb00f8f672fbff5bd\",\"lessThan\":\"c89a529e823d51dd23c7ec0c047c7a454a428541\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/nvme/host/pci.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.163\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.87\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.0.17\",\"lessThanOrEqual\":\"6.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.3\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/9141144b37f30e3e7fa024bcfa0a13011e546ba9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b1814724e0d7162bdf4799f2d565381bc2251c63\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c89a529e823d51dd23c7ec0c047c7a454a428541\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dfb6d54893d544151e7f480bc44cfe7823f5ad23\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e1777b4286e526c58b4ee699344b0ad85aaf83a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T19:37:04+00:00",
"cve": "CVE-2022-50756",
"id": "CVE-2022-50756",
"initial_release_date": "2022-01-01T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: nvme-pci: fix mempool alloc size",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50756.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-03T00:36:40Z",
"cve": "CVE-2022-50756",
"id": "CVE-2022-50756",
"initial_release_date": "2025-12-25T01:04:05Z",
"product_status:known_affected": "420",
"product_status:known_not_affected": "301",
"product_status:recommended": "241",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2022-50756",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50756.json",
"version": "35"
}
}
}
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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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