CVE-2025-21966

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Once the target is configured, every matching write bio during the down interval deterministically overflows the neighbouring slab object \u2014 no race to win and the up/down cycle is periodic and predictable, so the attacker simply writes or retries.\nPR:L - Creating the dm-flakey table needs CAP_SYS_ADMIN, but on the systems where this feature is actually deployed (fstests/CI/QA fault-injection hosts) any unprivileged user with write access to the device or its mounted filesystem triggers the out-of-bounds write with ordinary writes.\nUI:N - The attacker's own writes drive the corruption; no action by another user or administrator is needed beyond the pre-existing device configuration.\nS:U - The out-of-bounds write corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The clone's bvec array aliases memory outside the original bio's allocation, and the subsequent `bio_for_each_folio_all()`/`folio_put()` walk reads back whatever now occupies that neighbouring live object, giving a controlled heap corruption primitive usable for arbitrary kernel memory disclosure.\nI:H - This is a direct heap out-of-bounds write of `struct bio_vec` records (page pointer, length, offset) into adjacent slab objects \u2014 from 16 bytes up to ~16 KB under attacker-inducible allocation-order fallback \u2014 a classic exploitable primitive for pointer corruption and control-flow hijack.\nA:H - Corrupting adjacent `dm_io`/`dm_target_io`/bio structures and calling `folio_put()` on garbage pointers reliably produces oopses, BUG_ONs, and page refcount corruption leading to kernel panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/dm-flakey.c"], "versions": [{"version": "1d9a943898533e83f20370c0e1448d606627522e", "lessThan": "818330f756f3800c37d738bd36bce60eac949938", "status": "affected", "versionType": "git"}, {"version": "1d9a943898533e83f20370c0e1448d606627522e", "lessThan": "5a87e46da2418c57b445371f5ca0958d5779ba5f", "status": "affected", "versionType": "git"}, {"version": "1d9a943898533e83f20370c0e1448d606627522e", "lessThan": "da070843e153471be4297a12fdaa64023276f40e", "status": "affected", "versionType": "git"}, {"version": "1d9a943898533e83f20370c0e1448d606627522e", "lessThan": "57e9417f69839cb10f7ffca684c38acd28ceb57b", "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-flakey.c"], "versions": [{"version": "6.5", "status": "affected"}, {"version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.84", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.20", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.8", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14", "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": "6.5", "versionEndExcluding": "6.6.84"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.12.20"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.13.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.14"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/818330f756f3800c37d738bd36bce60eac949938"}, {"url": "https://git.kernel.org/stable/c/5a87e46da2418c57b445371f5ca0958d5779ba5f"}, {"url": "https://git.kernel.org/stable/c/da070843e153471be4297a12fdaa64023276f40e"}, {"url": "https://git.kernel.org/stable/c/57e9417f69839cb10f7ffca684c38acd28ceb57b"}], "title": "dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-787", "lang": "en", "description": "CWE-787 Out-of-bounds Write"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2025-10-01T18:16:20.613850Z", "id": "CVE-2025-21966", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T18:16:24.672Z"}}]}}

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{"id": "CVE-2025-21966", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T18:16:20.613850Z", "version": "2.0.3"}}]}, "published": "2025-04-01T16:15:27.873", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/57e9417f69839cb10f7ffca684c38acd28ceb57b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5a87e46da2418c57b445371f5ca0958d5779ba5f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/818330f756f3800c37d738bd36bce60eac949938"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da070843e153471be4297a12fdaa64023276f40e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2025:7956", "cpe": "cpe:/o:redhat:enterprise_linux:10.0", "package": "kernel-0:6.12.0-55.12.1.el10_0", "product_name": "Red Hat Enterprise Linux 10", "release_date": "2025-05-19T00:00:00Z"}, {"advisory": "RHSA-2025:7903", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.17.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-19T00:00:00Z"}, {"advisory": "RHSA-2025:7903", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.17.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-19T00:00:00Z"}], "bugzilla": {"description": "kernel: dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature", "id": "2356605", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2356605"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-119", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndm-flakey: Fix memory corruption in optional corrupt_bio_byte feature\nFix memory corruption due to incorrect parameter being passed to bio_init"], "name": "CVE-2025-21966", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-04-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21966\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21966\nhttps://lore.kernel.org/linux-cve-announce/2025040145-CVE-2025-21966-afc6@gregkh/T"], "threat_severity": "Moderate"}

{}