{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50091", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T19:36:19.943Z", "datePublished": "2024-11-05T17:04:55.311Z", "dateUpdated": "2026-08-05T11:41:35.974Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:41:35.974Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm vdo: don't refer to dedupe_context after releasing it\n\nClear the dedupe_context pointer in a data_vio whenever ownership of\nthe context is lost, so that vdo can't examine it accidentally." } ], "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 path is reached by submitting block I/O to a local dm-vdo device-mapper target (writes to a VDO-backed filesystem or directly to the block device); no network protocol data is parsed here.\nAC:L - The attacker controls both sides of the race by generating sustained I/O load, which simultaneously drives UDS index query timeouts and exhausts the 2048-entry context pool — exactly the conditions that make query_index() take the early return that leaves the stale dedupe_context pointer live, and the attempt can be repeated indefinitely.\nPR:L - Any unprivileged local user with write access to a filesystem hosted on the VDO volume (the normal deployment) can generate the required I/O; no capability check guards the data path once the device exists.\nUI:N - Exploitation requires only the attacker's own I/O against an already-configured VDO device; no victim action is needed at exploit time.\nS:U - The corruption is confined to kernel memory and VDO state within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-release of a pooled object: the stale owner reads a recycled context's uds_request contents and follows context->requestor into another request's data_vio, and the resulting dedupe against an attacker-unrelated PBN can map a logical block onto another tenant's physical block, exposing its contents.\nI:H - Context stealing lets one request write dedupe advice into a different live data_vio, release a context still owned by another request, skew the unsigned zone->active counter, and take PBN locks/reference-count operations against an arbitrary physical block — corrupting both kernel structures and stored volume data.\nA:H - The stale pointer leads directly to a NULL/wild dereference of data_vio->duplicate.zone->thread_id (kernel oops), plus work-queue corruption from misdirected completions, the \"all contexts inactive\" assertion, and hung suspend/teardown of the storage device." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/md/dm-vdo/dedupe.c" ], "versions": [ { "version": "cfaf07fae7a262865a67b6010eef3bc0a1ae50b2", "lessThan": "63ef073084c67878d7a92e15ad055172da3f05a3", "status": "affected", "versionType": "git" }, { "version": "cfaf07fae7a262865a67b6010eef3bc0a1ae50b2", "lessThan": "0808ebf2f80b962e75741a41ced372a7116f1e26", "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/md/dm-vdo/dedupe.c" ], "versions": [ { "version": "6.9", "status": "affected" }, { "version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.4", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "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": "6.9", "versionEndExcluding": "6.11.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/63ef073084c67878d7a92e15ad055172da3f05a3" }, { "url": "https://git.kernel.org/stable/c/0808ebf2f80b962e75741a41ced372a7116f1e26" } ], "title": "dm vdo: don't refer to dedupe_context after releasing it", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-50091", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2025-10-01T20:23:05.781358Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "description": "CWE-noinfo Not enough information" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:27:19.950Z" } } ] } }