CVE-2024-50091

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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 \u2014 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 \u2014 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"}}]}}

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{"bugzilla": {"description": "kernel: dm vdo: don't refer to dedupe_context after releasing it", "id": "2323923", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2323923"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-823", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndm vdo: don't refer to dedupe_context after releasing it\nClear the dedupe_context pointer in a data_vio whenever ownership of\nthe context is lost, so that vdo can't examine it accidentally."], "name": "CVE-2024-50091", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-11-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-50091\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-50091\nhttps://lore.kernel.org/linux-cve-announce/2024110551-CVE-2024-50091-0c7e@gregkh/T"], "threat_severity": "Moderate"}

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