{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50756", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T13:02:21.545Z", "datePublished": "2025-12-24T13:05:49.635Z", "dateUpdated": "2026-08-05T08:59:42.355Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:59:42.355Z" }, "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'd need a 4MB in exactly 127 phys segments\non a queue that doesn't support SGLs), this memory corruption has been\nobserved by kfence." } ], "metrics": [ { "cvssV3_1": { "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" }, "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 ~2–4MB 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/host/pci.c" ], "versions": [ { "version": "943e942e6266f22babee5efeb00f8f672fbff5bd", "lessThan": "dfb6d54893d544151e7f480bc44cfe7823f5ad23", "status": "affected", "versionType": "git" }, { "version": "943e942e6266f22babee5efeb00f8f672fbff5bd", "lessThan": "9141144b37f30e3e7fa024bcfa0a13011e546ba9", "status": "affected", "versionType": "git" }, { "version": "943e942e6266f22babee5efeb00f8f672fbff5bd", "lessThan": "e1777b4286e526c58b4ee699344b0ad85aaf83a0", "status": "affected", "versionType": "git" }, { "version": "943e942e6266f22babee5efeb00f8f672fbff5bd", "lessThan": "b1814724e0d7162bdf4799f2d565381bc2251c63", "status": "affected", "versionType": "git" }, { "version": "943e942e6266f22babee5efeb00f8f672fbff5bd", "lessThan": "c89a529e823d51dd23c7ec0c047c7a454a428541", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/host/pci.c" ], "versions": [ { "version": "4.18", "status": "affected" }, { "version": "0", "lessThan": "4.18", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.87", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.17", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.3", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "5.15.87" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.0.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.1.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.2" } ] } ] } ], "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" } } } }