{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64564", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.797Z", "datePublished": "2026-08-04T06:23:23.339Z", "dateUpdated": "2026-08-09T03:38:13.350Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-09T03:38:13.350Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: don't free the ASCONF's own transport in DEL-IP processing\n\nsctp_process_asconf() caches the transport the ASCONF chunk is processed\nagainst in asconf->transport (== chunk->transport, set once in sctp_rcv()).\nFor an ASCONF located through its Address Parameter by\n__sctp_rcv_asconf_lookup(), that cached transport corresponds to the\nAddress Parameter, which need not be the packet's source address.\n\nsctp_process_asconf_param() rejects a DEL-IP for the packet source address\n(ADDIP D8, SCTP_ERROR_DEL_SRC_IP), but nothing protects asconf->transport.\nA single ASCONF can therefore carry, in order:\n\n [Address Parameter L] [DEL-IP L] [DEL-IP 0.0.0.0]\n\nwhere L differs from the source. The DEL-IP for L passes the D8 check and\ncalls sctp_assoc_rm_peer() on the transport that asconf->transport still\npoints at, freeing it (RCU-deferred). The following wildcard DEL-IP then\nreuses the now-dangling asconf->transport in sctp_assoc_set_primary() and\nsctp_assoc_del_nonprimary_peers(): set_primary() dereferences the freed\ntransport (->ipaddr, ->state) and plants the dangling pointer into\nasoc->peer.primary_path / active_path, and del_nonprimary_peers(), keeping\nonly the pointer that is no longer on the list, removes every real\ntransport, leaving the association with a transport_count of 0 and\nprimary_path/active_path pointing at freed memory.\n\nReject a DEL-IP that targets the transport the ASCONF is being processed\nagainst, mirroring the existing source-address guard, so the wildcard\nbranch can never reuse a freed transport."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is in SCTP ASCONF receive processing (sctp_rcv \u2192 sctp_sf_do_asconf \u2192 sctp_process_asconf \u2192 sctp_process_asconf_param); a remote peer triggers it by sending a crafted ASCONF over IP/IPv6 on an established association, matching kernel guidance that net/ stack bugs reachable via received packets are Network.\nAC:L - A single attacker-controlled ASCONF with [Address Parameter L][DEL-IP L][DEL-IP 0.0.0.0] reliably frees asconf->transport then reuses it in the same softirq; the peer fully controls multi-homing, serial, and parameter order, with no race or other condition outside attacker influence.\nPR:N - Any remote SCTP peer that completes a normal association with ADD-IP negotiated can send the ASCONF; SCTP-AUTH keys come from the handshake the peer itself performs (or addip_noauth), and no local credentials or capabilities on the target are required.\nUI:N - Exploitation requires only attacker-sent SCTP packets processed automatically in the receive/state-machine path; no victim user action such as opening a file or mounting a device is needed.\nS:U - Impact is confined to the vulnerable host kernel (sctp_transport UAF / crash or privilege escalation) and does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - This is a heap use-after-free of an sctp_transport planted into primary_path/active_path after RCU-deferred free; freed-object reuse yields arbitrary kernel read primitives, scored High per UAF guidance.\nI:H - The same transport UAF enables heap spraying and write/control-flow hijacking via later dereferences of the dangling primary_path/active_path, so integrity impact is High.\nA:H - set_primary() immediately dereferences the freed transport and leaves the association with transport_count 0 and dangling path pointers, causing a reproducible kernel oops/panic on subsequent use, which is High availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sctp/sm_make_chunk.c"], "versions": [{"version": "42e30bf3463cd37d73839376662cb79b4d5c416c", "lessThan": "fedeb4468987bcaff85fe3061de5ae052d414740", "status": "affected", "versionType": "git"}, {"version": "42e30bf3463cd37d73839376662cb79b4d5c416c", "lessThan": "74e8f3e7114f0e26d1b2c4c048044db9fcc27603", "status": "affected", "versionType": "git"}, {"version": "42e30bf3463cd37d73839376662cb79b4d5c416c", "lessThan": "85aca407c560aba81b5ce9d3d6cf94c74077d19b", "status": "affected", "versionType": "git"}, {"version": "42e30bf3463cd37d73839376662cb79b4d5c416c", "lessThan": "d136b29bf91dd8e3161281b87de597b7311d9462", "status": "affected", "versionType": "git"}, {"version": "42e30bf3463cd37d73839376662cb79b4d5c416c", "lessThan": "9b2854f86f0b56e9027d68e7a3fc909d1a9b566f", "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/sctp/sm_make_chunk.c"], "versions": [{"version": "2.6.25", "status": "affected"}, {"version": "0", "lessThan": "2.6.25", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc5", "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": "2.6.25", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "7.2-rc5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/fedeb4468987bcaff85fe3061de5ae052d414740"}, {"url": "https://git.kernel.org/stable/c/74e8f3e7114f0e26d1b2c4c048044db9fcc27603"}, {"url": "https://git.kernel.org/stable/c/85aca407c560aba81b5ce9d3d6cf94c74077d19b"}, {"url": "https://git.kernel.org/stable/c/d136b29bf91dd8e3161281b87de597b7311d9462"}, {"url": "https://git.kernel.org/stable/c/9b2854f86f0b56e9027d68e7a3fc909d1a9b566f"}, {"url": "https://matrix.tencent.com/en/2026/08/06/sctphantom-CVE-2026-64564"}], "title": "sctp: don't free the ASCONF's own transport in DEL-IP processing", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/08/06/3"}, {"url": "http://www.openwall.com/lists/oss-security/2026/08/06/4"}, {"url": "http://www.openwall.com/lists/oss-security/2026/08/06/13"}, {"url": "http://www.openwall.com/lists/oss-security/2026/08/07/1"}, {"url": "http://www.openwall.com/lists/oss-security/2026/08/07/2"}, {"url": "http://www.openwall.com/lists/oss-security/2026/08/07/8"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-08-08T01:31:36.501Z"}}]}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sctp/sm_make_chunk.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "fedeb4468987bcaff85fe3061de5ae052d414740", "status": "affected", "version": "42e30bf3463cd37d73839376662cb79b4d5c416c", "versionType": "git"}, {"lessThan": "74e8f3e7114f0e26d1b2c4c048044db9fcc27603", "status": "affected", "version": "42e30bf3463cd37d73839376662cb79b4d5c416c", "versionType": "git"}, {"lessThan": "85aca407c560aba81b5ce9d3d6cf94c74077d19b", "status": "affected", "version": "42e30bf3463cd37d73839376662cb79b4d5c416c", "versionType": "git"}, {"lessThan": "d136b29bf91dd8e3161281b87de597b7311d9462", "status": "affected", "version": "42e30bf3463cd37d73839376662cb79b4d5c416c", "versionType": "git"}, {"lessThan": "9b2854f86f0b56e9027d68e7a3fc909d1a9b566f", "status": "affected", "version": "42e30bf3463cd37d73839376662cb79b4d5c416c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sctp/sm_make_chunk.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.25"}, {"lessThan": "2.6.25", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc5", "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\nsctp: don't free the ASCONF's own transport in DEL-IP processing\n\nsctp_process_asconf() caches the transport the ASCONF chunk is processed\nagainst in asconf->transport (== chunk->transport, set once in sctp_rcv()).\nFor an ASCONF located through its Address Parameter by\n__sctp_rcv_asconf_lookup(), that cached transport corresponds to the\nAddress Parameter, which need not be the packet's source address.\n\nsctp_process_asconf_param() rejects a DEL-IP for the packet source address\n(ADDIP D8, SCTP_ERROR_DEL_SRC_IP), but nothing protects asconf->transport.\nA single ASCONF can therefore carry, in order:\n\n [Address Parameter L] [DEL-IP L] [DEL-IP 0.0.0.0]\n\nwhere L differs from the source. The DEL-IP for L passes the D8 check and\ncalls sctp_assoc_rm_peer() on the transport that asconf->transport still\npoints at, freeing it (RCU-deferred). The following wildcard DEL-IP then\nreuses the now-dangling asconf->transport in sctp_assoc_set_primary() and\nsctp_assoc_del_nonprimary_peers(): set_primary() dereferences the freed\ntransport (->ipaddr, ->state) and plants the dangling pointer into\nasoc->peer.primary_path / active_path, and del_nonprimary_peers(), keeping\nonly the pointer that is no longer on the list, removes every real\ntransport, leaving the association with a transport_count of 0 and\nprimary_path/active_path pointing at freed memory.\n\nReject a DEL-IP that targets the transport the ASCONF is being processed\nagainst, mirroring the existing source-address guard, so the wildcard\nbranch can never reuse a freed transport."}], "id": "CVE-2026-64564", "lastModified": "2026-08-09T04:17:43.283", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-04T07:16:31.340", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/74e8f3e7114f0e26d1b2c4c048044db9fcc27603"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/85aca407c560aba81b5ce9d3d6cf94c74077d19b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9b2854f86f0b56e9027d68e7a3fc909d1a9b566f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d136b29bf91dd8e3161281b87de597b7311d9462"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fedeb4468987bcaff85fe3061de5ae052d414740"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://matrix.tencent.com/en/2026/08/06/sctphantom-CVE-2026-64564"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/06/13"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/06/3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/06/4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/07/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/07/2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/07/8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: sctp: don't free the ASCONF's own transport in DEL-IP processing", "id": "2510890", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510890"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsctp: don't free the ASCONF's own transport in DEL-IP processing\nsctp_process_asconf() caches the transport the ASCONF chunk is processed\nagainst in asconf->transport (== chunk->transport, set once in sctp_rcv()).\nFor an ASCONF located through its Address Parameter by\n__sctp_rcv_asconf_lookup(), that cached transport corresponds to the\nAddress Parameter, which need not be the packet's source address.\nsctp_process_asconf_param() rejects a DEL-IP for the packet source address\n(ADDIP D8, SCTP_ERROR_DEL_SRC_IP), but nothing protects asconf->transport.\nA single ASCONF can therefore carry, in order:\n[Address Parameter L] [DEL-IP L] [DEL-IP 0.0.0.0]\nwhere L differs from the source. The DEL-IP for L passes the D8 check and\ncalls sctp_assoc_rm_peer() on the transport that asconf->transport still\npoints at, freeing it (RCU-deferred). The following wildcard DEL-IP then\nreuses the now-dangling asconf->transport in sctp_assoc_set_primary() and\nsctp_assoc_del_nonprimary_peers(): set_primary() dereferences the freed\ntransport (->ipaddr, ->state) and plants the dangling pointer into\nasoc->peer.primary_path / active_path, and del_nonprimary_peers(), keeping\nonly the pointer that is no longer on the list, removes every real\ntransport, leaving the association with a transport_count of 0 and\nprimary_path/active_path pointing at freed memory.\nReject a DEL-IP that targets the transport the ASCONF is being processed\nagainst, mirroring the existing source-address guard, so the wildcard\nbranch can never reuse a freed transport.", "A flaw was found in the Stream Control Transmission Protocol (SCTP) implementation within the Linux kernel. A remote attacker could send a specially crafted sequence of ASCONF (Add IP Address Configuration) chunks, including DEL-IP (Delete IP Address) parameters, to trigger a use-after-free condition. This memory corruption could lead to a system crash, resulting in a denial of service, and potentially allow for arbitrary code execution."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, prevent the `sctp` kernel module from loading. Create a file named `/etc/modprobe.d/disable-sctp.conf` with the following content:\n```\ninstall sctp /bin/true\nblacklist sctp\n```\nAfter creating the file, regenerate the initramfs and reboot the system for the changes to take effect. Applications or services that rely on the SCTP protocol cannot use this mitigation and should prioritize applying the fix."}, "name": "CVE-2026-64564", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2026-08-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64564\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64564\nhttps://lore.kernel.org/linux-cve-announce/2026080404-CVE-2026-64564-6762@gregkh/T"], "statement": "The `sctp` kernel module is blacklisted by default on Red Hat Enterprise Linux 8, 9 and 10.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[42e30bf3463cd37d73839376662cb79b4d5c416c,fedeb4468987bcaff85fe3061de5ae052d414740)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[42e30bf3463cd37d73839376662cb79b4d5c416c,74e8f3e7114f0e26d1b2c4c048044db9fcc27603)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[42e30bf3463cd37d73839376662cb79b4d5c416c,85aca407c560aba81b5ce9d3d6cf94c74077d19b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[42e30bf3463cd37d73839376662cb79b4d5c416c,d136b29bf91dd8e3161281b87de597b7311d9462)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[42e30bf3463cd37d73839376662cb79b4d5c416c,9b2854f86f0b56e9027d68e7a3fc909d1a9b566f)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.25"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.25)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-04T08:15:06.119449+00:00", "updated": "2026-08-11T03:30:03.274088+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}