CVE-2025-68317

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Remote packets alone cannot construct the required cross-ring notification chain.\nAC:L - The attacker can deterministically reuse a TCP skb with small sends and MSG_MORE across two attacker-created rings. Any completion-list race is attacker-controlled through concurrent submissions and ACK or socket timing.\nPR:L - Normal io_uring setup, TCP socket creation, and zero-copy sends require no capabilities when io_uring is enabled. An ordinary unprivileged account with a small buffer within RLIMIT_MEMLOCK can reach the flaw without user namespaces.\nUI:N - The attacker creates the rings, submits both sends, and causes skb completion without any victim action.\nS:U - The corruption affects the host kernel and represents a standard local privilege-escalation boundary rather than a VM, IOMMU, or other security-scope escape.\nC:H - Wrong-context completion modifies a foreign ring\u2019s completion list without its mutex; racing a flush can corrupt its request free list and reallocate a still-linked notification, producing UAF and type confusion capable of kernel-memory disclosure. [NVD assigns C:H to the same root-cause defect](https://nvd.nist.gov/vuln/detail/CVE-2025-39963).\nI:H - The corrupted free list permits an active io_kiocb to be reused and subsequently interpreted as notification data, enabling kernel heap corruption and potentially arbitrary writes or control-flow hijacking.\nA:H - The wrong-lock completion has been observed by [syzkaller](https://syzkaller.appspot.com/bug?id=423c19d7bb9000c4ddc 1c63f9faface466fb6c35); without the diagnostic stopping execution, the resulting list corruption can cause an oops, panic, hang, or repeatable resource leak."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/notif.c"], "versions": [{"version": "6fe4220912d19152a26ce19713ab232f4263018d", "lessThan": "aaafd17d3f4be2c15539359a5b4bfa00237f687f", "status": "affected", "versionType": "git"}, {"version": "6fe4220912d19152a26ce19713ab232f4263018d", "lessThan": "d664a3ce3a604231a0b144c152a3755d03b18b60", "status": "affected", "versionType": "git"}, {"version": "6fe4220912d19152a26ce19713ab232f4263018d", "lessThan": "ab3ea6eac5f45669b091309f592c4ea324003053", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/notif.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.58", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.8", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "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": "6.10", "versionEndExcluding": "6.12.58"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.17.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/aaafd17d3f4be2c15539359a5b4bfa00237f687f"}, {"url": "https://git.kernel.org/stable/c/d664a3ce3a604231a0b144c152a3755d03b18b60"}, {"url": "https://git.kernel.org/stable/c/ab3ea6eac5f45669b091309f592c4ea324003053"}], "title": "io_uring/zctx: check chained notif contexts", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-68317", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T22:00:54.118508Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T22:02:49.138Z"}}]}}

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[NVD assigns C:H to the same root-cause defect](https://nvd.nist.gov/vuln/detail/CVE-2025-39963).\nI:H - The corrupted free list permits an active io_kiocb to be reused and subsequently interpreted as notification data, enabling kernel heap corruption and potentially arbitrary writes or control-flow hijacking.\nA:H - The wrong-lock completion has been observed by [syzkaller](https://syzkaller.appspot.com/bug?id=423c19d7bb9000c4ddc 1c63f9faface466fb6c35); without the diagnostic stopping execution, the resulting list corruption can cause an oops, panic, hang, or repeatable resource leak."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6fe4220912d19152a26ce19713ab232f4263018d", "lessThan": "aaafd17d3f4be2c15539359a5b4bfa00237f687f", "versionType": "git"}, {"status": "affected", "version": "6fe4220912d19152a26ce19713ab232f4263018d", "lessThan": "d664a3ce3a604231a0b144c152a3755d03b18b60", "versionType": "git"}, {"status": "affected", "version": "6fe4220912d19152a26ce19713ab232f4263018d", "lessThan": "ab3ea6eac5f45669b091309f592c4ea324003053", "versionType": "git"}], "programFiles": ["io_uring/notif.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"status": "unaffected", "version": "0", "lessThan": "6.10", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.58", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.17.8", "versionType": "semver", "lessThanOrEqual": "6.17.*"}, {"status": "unaffected", "version": "6.18", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["io_uring/notif.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/aaafd17d3f4be2c15539359a5b4bfa00237f687f"}, {"url": "https://git.kernel.org/stable/c/d664a3ce3a604231a0b144c152a3755d03b18b60"}, {"url": "https://git.kernel.org/stable/c/ab3ea6eac5f45669b091309f592c4ea324003053"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/zctx: check chained notif contexts\n\nSend zc only links ubuf_info for requests coming from the same context.\nThere are some ambiguous syz reports, so let's check the assumption on\nnotification completion."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.58", "versionStartIncluding": "6.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.17.8", "versionStartIncluding": "6.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18", "versionStartIncluding": "6.10"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:10:50.931Z"}}}, "cveMetadata": {"cveId": "CVE-2025-68317", "state": "PUBLISHED", "dateUpdated": "2026-10-15T22:02:49.138Z", "dateReserved": "2025-12-16T14:48:05.295Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-12-16T15:39:47.159Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["io_uring/notif.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "aaafd17d3f4be2c15539359a5b4bfa00237f687f", "status": "affected", "version": "6fe4220912d19152a26ce19713ab232f4263018d", "versionType": "git"}, {"lessThan": "d664a3ce3a604231a0b144c152a3755d03b18b60", "status": "affected", "version": "6fe4220912d19152a26ce19713ab232f4263018d", "versionType": "git"}, {"lessThan": "ab3ea6eac5f45669b091309f592c4ea324003053", "status": "affected", "version": "6fe4220912d19152a26ce19713ab232f4263018d", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["io_uring/notif.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"lessThan": "6.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.58", "versionType": "semver"}, {"lessThanOrEqual": "6.17.*", "status": "unaffected", "version": "6.17.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.18", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/zctx: check chained notif contexts\n\nSend zc only links ubuf_info for requests coming from the same context.\nThere are some ambiguous syz reports, so let's check the assumption on\nnotification completion."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nio_uring/zctx: comprobar contextos de notificaci\u00f3n encadenados\n\nEnviar zc solo enlaza ubuf_info para solicitudes provenientes del mismo contexto.\nHay algunos informes syz ambiguos, as\u00ed que comprobemos la suposici\u00f3n sobre la finalizaci\u00f3n de la notificaci\u00f3n."}], "id": "CVE-2025-68317", "lastModified": "2026-10-15T22:19:12.023", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-68317", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T22:00:54.118508Z", "version": "2.0.3"}}]}, "published": "2025-12-16T16:16:11.280", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aaafd17d3f4be2c15539359a5b4bfa00237f687f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ab3ea6eac5f45669b091309f592c4ea324003053"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d664a3ce3a604231a0b144c152a3755d03b18b60"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: io_uring/zctx: check chained notif contexts", "id": "2422805", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2422805"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-68317", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-68317\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-68317\nhttps://lore.kernel.org/linux-cve-announce/2025121656-CVE-2025-68317-28c8@gregkh/T"], "threat_severity": "Low"}

{}