CVE-2023-54085

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2023-54085", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T13:02:52.515Z", "datePublished": "2025-12-24T13:06:16.161Z", "dateUpdated": "2026-10-15T21:41:39.088Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:17:06.087Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix NULL pointer dereference on fastopen early fallback\n\nIn case of early fallback to TCP, subflow_syn_recv_sock() deletes\nthe subflow context before returning the newly allocated sock to\nthe caller.\n\nThe fastopen path does not cope with the above unconditionally\ndereferencing the subflow context."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The crash is triggered entirely by a received TCP SYN packet with fastopen data arriving at an MPTCP listening socket, processed in the TCP input path (`tcp_conn_request`). Any routable remote peer can reach it.\nAC:L - The attacker fully controls the trigger \u2014 a TFO SYN with data and no MPTCP options deterministically causes `subflow_ulp_clone()` to drop the context and `subflow_prep_synack()` to pass NULL; there is no race, no memory-layout dependency, and the TFO cookie is freely obtainable from a prior normal connection.\nPR:N - No credentials or prior authentication are required; the fault occurs during connection establishment, before any application-level handshake, on a socket that has not yet been accepted.\nUI:N - Exploitation requires only that the attacker send packets to the listening port; no action by any local user or administrator is needed at attack time.\nS:U - The NULL dereference occurs in the kernel's own network stack and affects only the kernel's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The faulting access is a load of `subflow->tcp_sock` at a fixed small offset from NULL, which aborts immediately; no attacker-controlled data is read back or disclosed.\nI:N - Execution aborts on the first NULL load before `subflow->is_mptfo = 1` or any queue manipulation, so no kernel memory is modified and no control-flow primitive is obtained.\nA:H - The dereference at NULL+~208 bytes is always unmapped and occurs in NET_RX softirq context, so `oops_end()` takes the `in_interrupt()` path and issues `panic(\"Fatal exception in interrupt\")` \u2014 a guaranteed, remotely repeatable full system crash."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mptcp/fastopen.c"], "versions": [{"version": "36b122baf6a8bd46b4a591f12f4ed17b22257408", "lessThan": "95135835519b0ab931c39908b2c99e9fb3c9068b", "status": "affected", "versionType": "git"}, {"version": "36b122baf6a8bd46b4a591f12f4ed17b22257408", "lessThan": "c0ff6f6da66a7791a32c0234388b1bdc00244917", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mptcp/fastopen.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.2.12", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.3", "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": "6.2", "versionEndExcluding": "6.2.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/95135835519b0ab931c39908b2c99e9fb3c9068b"}, {"url": "https://git.kernel.org/stable/c/c0ff6f6da66a7791a32c0234388b1bdc00244917"}], "title": "mptcp: fix NULL pointer dereference on fastopen early fallback", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-54085", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-15T21:38:15.912200Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:39.088Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-54085", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-15T21:38:15.912200Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:38:16.395Z"}}], "cna": {"title": "mptcp: fix NULL pointer dereference on fastopen early fallback", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.5, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - The crash is triggered entirely by a received TCP SYN packet with fastopen data arriving at an MPTCP listening socket, processed in the TCP input path (`tcp_conn_request`). Any routable remote peer can reach it.\nAC:L - The attacker fully controls the trigger \u2014 a TFO SYN with data and no MPTCP options deterministically causes `subflow_ulp_clone()` to drop the context and `subflow_prep_synack()` to pass NULL; there is no race, no memory-layout dependency, and the TFO cookie is freely obtainable from a prior normal connection.\nPR:N - No credentials or prior authentication are required; the fault occurs during connection establishment, before any application-level handshake, on a socket that has not yet been accepted.\nUI:N - Exploitation requires only that the attacker send packets to the listening port; no action by any local user or administrator is needed at attack time.\nS:U - The NULL dereference occurs in the kernel's own network stack and affects only the kernel's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The faulting access is a load of `subflow->tcp_sock` at a fixed small offset from NULL, which aborts immediately; no attacker-controlled data is read back or disclosed.\nI:N - Execution aborts on the first NULL load before `subflow->is_mptfo = 1` or any queue manipulation, so no kernel memory is modified and no control-flow primitive is obtained.\nA:H - The dereference at NULL+~208 bytes is always unmapped and occurs in NET_RX softirq context, so `oops_end()` takes the `in_interrupt()` path and issues `panic(\"Fatal exception in interrupt\")` \u2014 a guaranteed, remotely repeatable full system crash."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "36b122baf6a8bd46b4a591f12f4ed17b22257408", "lessThan": "95135835519b0ab931c39908b2c99e9fb3c9068b", "versionType": "git"}, {"status": "affected", "version": "36b122baf6a8bd46b4a591f12f4ed17b22257408", "lessThan": "c0ff6f6da66a7791a32c0234388b1bdc00244917", "versionType": "git"}], "programFiles": ["net/mptcp/fastopen.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.2"}, {"status": "unaffected", "version": "0", "lessThan": "6.2", "versionType": "semver"}, {"status": "unaffected", "version": "6.2.12", "versionType": "semver", "lessThanOrEqual": "6.2.*"}, {"status": "unaffected", "version": "6.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/mptcp/fastopen.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/95135835519b0ab931c39908b2c99e9fb3c9068b"}, {"url": "https://git.kernel.org/stable/c/c0ff6f6da66a7791a32c0234388b1bdc00244917"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix NULL pointer dereference on fastopen early fallback\n\nIn case of early fallback to TCP, subflow_syn_recv_sock() deletes\nthe subflow context before returning the newly allocated sock to\nthe caller.\n\nThe fastopen path does not cope with the above unconditionally\ndereferencing the subflow context."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.2.12", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.3", "versionStartIncluding": "6.2"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:17:06.087Z"}}}, "cveMetadata": {"cveId": "CVE-2023-54085", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:41:39.088Z", "dateReserved": "2025-12-24T13:02:52.515Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-12-24T13:06:16.161Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/mptcp/fastopen.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "95135835519b0ab931c39908b2c99e9fb3c9068b", "status": "affected", "version": "36b122baf6a8bd46b4a591f12f4ed17b22257408", "versionType": "git"}, {"lessThan": "c0ff6f6da66a7791a32c0234388b1bdc00244917", "status": "affected", "version": "36b122baf6a8bd46b4a591f12f4ed17b22257408", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/mptcp/fastopen.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.2"}, {"lessThan": "6.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.2.*", "status": "unaffected", "version": "6.2.12", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.3", "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\nmptcp: fix NULL pointer dereference on fastopen early fallback\n\nIn case of early fallback to TCP, subflow_syn_recv_sock() deletes\nthe subflow context before returning the newly allocated sock to\nthe caller.\n\nThe fastopen path does not cope with the above unconditionally\ndereferencing the subflow context."}], "id": "CVE-2023-54085", "lastModified": "2026-10-15T22:17:52.167", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-54085", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:38:15.912200Z", "version": "2.0.3"}}]}, "published": "2025-12-24T13:16:10.357", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/95135835519b0ab931c39908b2c99e9fb3c9068b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c0ff6f6da66a7791a32c0234388b1bdc00244917"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: mptcp: fix NULL pointer dereference on fastopen early fallback", "id": "2425184", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2425184"}, "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": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-54085", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-54085\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-54085\nhttps://lore.kernel.org/linux-cve-announce/2025122405-CVE-2023-54085-7e32@gregkh/T"], "threat_severity": "Moderate"}

{}