CVE-2025-39852

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This ends up causing a memory-leak:\n\nunreferenced object 0xffff0000281a8200 (size 2496):\n comm \"softirq\", pid 0, jiffies 4295174684\n hex dump (first 32 bytes):\n 7f 00 00 06 7f 00 00 06 00 00 00 00 cb a8 88 13 ................\n 0a 00 03 61 00 00 00 00 00 00 00 00 00 00 00 00 ...a............\n backtrace (crc 5ebdbe15):\n kmemleak_alloc+0x44/0xe0\n kmem_cache_alloc_noprof+0x248/0x470\n sk_prot_alloc+0x48/0x120\n sk_clone_lock+0x38/0x3b0\n inet_csk_clone_lock+0x34/0x150\n tcp_create_openreq_child+0x3c/0x4a8\n tcp_v6_syn_recv_sock+0x1c0/0x620\n tcp_check_req+0x588/0x790\n tcp_v6_rcv+0x5d0/0xc18\n ip6_protocol_deliver_rcu+0x2d8/0x4c0\n ip6_input_finish+0x74/0x148\n ip6_input+0x50/0x118\n ip6_sublist_rcv+0x2fc/0x3b0\n ipv6_list_rcv+0x114/0x170\n __netif_receive_skb_list_core+0x16c/0x200\n netif_receive_skb_list_internal+0x1f0/0x2d0\n\nThis is because in tcp_v6_syn_recv_sock (and the IPv4 counterpart), when\nexiting upon error, inet_csk_prepare_forced_close() and tcp_done() need\nto be called. They make sure the newsk will end up being correctly\nfree'd.\n\ntcp_v4_syn_recv_sock() makes this very clear by having the put_and_exit\nlabel that takes care of things. So, this patch here makes sure\ntcp_v4_syn_recv_sock and tcp_v6_syn_recv_sock have similar\nerror-handling and thus fixes the leak for TCP-AO."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/tcp_ipv6.c"], "versions": [{"version": "06b22ef29591f625ef877ae00d82192938e29e60", "lessThan": "46d33c878fc0b3d7570366b2c9912395b3f4e701", "status": "affected", "versionType": "git"}, {"version": "06b22ef29591f625ef877ae00d82192938e29e60", "lessThan": "3d2b356d994a8801acb397cafd28b13672c37ab5", "status": "affected", "versionType": "git"}, {"version": "06b22ef29591f625ef877ae00d82192938e29e60", "lessThan": "fa390321aba0a54d0f7ae95ee4ecde1358bb9234", "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/ipv6/tcp_ipv6.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.46", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.6", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17", "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": "6.7", "versionEndExcluding": "6.12.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.16.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.17"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/46d33c878fc0b3d7570366b2c9912395b3f4e701"}, {"url": "https://git.kernel.org/stable/c/3d2b356d994a8801acb397cafd28b13672c37ab5"}, {"url": "https://git.kernel.org/stable/c/fa390321aba0a54d0f7ae95ee4ecde1358bb9234"}], "title": "net/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6", "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-2025-39852", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-14T19:21:28.643713Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-401", "description": "CWE-401 Missing Release of Memory after Effective Lifetime"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T19:23:12.597Z"}}]}}

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This ends up causing a memory-leak:\n\nunreferenced object 0xffff0000281a8200 (size 2496):\n comm \"softirq\", pid 0, jiffies 4295174684\n hex dump (first 32 bytes):\n 7f 00 00 06 7f 00 00 06 00 00 00 00 cb a8 88 13 ................\n 0a 00 03 61 00 00 00 00 00 00 00 00 00 00 00 00 ...a............\n backtrace (crc 5ebdbe15):\n kmemleak_alloc+0x44/0xe0\n kmem_cache_alloc_noprof+0x248/0x470\n sk_prot_alloc+0x48/0x120\n sk_clone_lock+0x38/0x3b0\n inet_csk_clone_lock+0x34/0x150\n tcp_create_openreq_child+0x3c/0x4a8\n tcp_v6_syn_recv_sock+0x1c0/0x620\n tcp_check_req+0x588/0x790\n tcp_v6_rcv+0x5d0/0xc18\n ip6_protocol_deliver_rcu+0x2d8/0x4c0\n ip6_input_finish+0x74/0x148\n ip6_input+0x50/0x118\n ip6_sublist_rcv+0x2fc/0x3b0\n ipv6_list_rcv+0x114/0x170\n __netif_receive_skb_list_core+0x16c/0x200\n netif_receive_skb_list_internal+0x1f0/0x2d0\n\nThis is because in tcp_v6_syn_recv_sock (and the IPv4 counterpart), when\nexiting upon error, inet_csk_prepare_forced_close() and tcp_done() need\nto be called. They make sure the newsk will end up being correctly\nfree'd.\n\ntcp_v4_syn_recv_sock() makes this very clear by having the put_and_exit\nlabel that takes care of things. So, this patch here makes sure\ntcp_v4_syn_recv_sock and tcp_v6_syn_recv_sock have similar\nerror-handling and thus fixes the leak for TCP-AO."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.46", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.16.6", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.17", "versionStartIncluding": "6.7"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:37:41.374Z"}}}, "cveMetadata": {"cveId": "CVE-2025-39852", "state": "PUBLISHED", "dateUpdated": "2026-05-11T21:37:41.374Z", "dateReserved": "2025-04-16T07:20:57.142Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-09-19T15:26:24.312Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv6/tcp_ipv6.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "46d33c878fc0b3d7570366b2c9912395b3f4e701", "status": "affected", "version": "06b22ef29591f625ef877ae00d82192938e29e60", "versionType": "git"}, {"lessThan": "3d2b356d994a8801acb397cafd28b13672c37ab5", "status": "affected", "version": "06b22ef29591f625ef877ae00d82192938e29e60", "versionType": "git"}, {"lessThan": "fa390321aba0a54d0f7ae95ee4ecde1358bb9234", "status": "affected", "version": "06b22ef29591f625ef877ae00d82192938e29e60", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv6/tcp_ipv6.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.46", "versionType": "semver"}, {"lessThanOrEqual": "6.16.*", "status": "unaffected", "version": "6.16.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F7E2B332-E920-4CAC-B400-288602DB6F16", "versionEndExcluding": "6.12.46", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "548F104C-0F08-438B-9C97-64C903F0C678", "versionEndExcluding": "6.16.6", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*", "matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*", "matchCriteriaId": "C730CD9A-D969-4A8E-9522-162AAF7C0EE9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*", "matchCriteriaId": "39982C4B-716E-4B2F-8196-FA301F47807D", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*", "matchCriteriaId": "340BEEA9-D70D-4290-B502-FBB1032353B1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6\n\nWhen tcp_ao_copy_all_matching() fails in tcp_v6_syn_recv_sock() it just\nexits the function. This ends up causing a memory-leak:\n\nunreferenced object 0xffff0000281a8200 (size 2496):\n comm \"softirq\", pid 0, jiffies 4295174684\n hex dump (first 32 bytes):\n 7f 00 00 06 7f 00 00 06 00 00 00 00 cb a8 88 13 ................\n 0a 00 03 61 00 00 00 00 00 00 00 00 00 00 00 00 ...a............\n backtrace (crc 5ebdbe15):\n kmemleak_alloc+0x44/0xe0\n kmem_cache_alloc_noprof+0x248/0x470\n sk_prot_alloc+0x48/0x120\n sk_clone_lock+0x38/0x3b0\n inet_csk_clone_lock+0x34/0x150\n tcp_create_openreq_child+0x3c/0x4a8\n tcp_v6_syn_recv_sock+0x1c0/0x620\n tcp_check_req+0x588/0x790\n tcp_v6_rcv+0x5d0/0xc18\n ip6_protocol_deliver_rcu+0x2d8/0x4c0\n ip6_input_finish+0x74/0x148\n ip6_input+0x50/0x118\n ip6_sublist_rcv+0x2fc/0x3b0\n ipv6_list_rcv+0x114/0x170\n __netif_receive_skb_list_core+0x16c/0x200\n netif_receive_skb_list_internal+0x1f0/0x2d0\n\nThis is because in tcp_v6_syn_recv_sock (and the IPv4 counterpart), when\nexiting upon error, inet_csk_prepare_forced_close() and tcp_done() need\nto be called. They make sure the newsk will end up being correctly\nfree'd.\n\ntcp_v4_syn_recv_sock() makes this very clear by having the put_and_exit\nlabel that takes care of things. So, this patch here makes sure\ntcp_v4_syn_recv_sock and tcp_v6_syn_recv_sock have similar\nerror-handling and thus fixes the leak for TCP-AO."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/tcp: Corrige la fuga de memoria del socket en el manejo de fallos de TCP-AO para IPv6\n\nCuando tcp_ao_copy_all_matching() falla en tcp_v6_syn_recv_sock(), simplemente sale de la funci\u00f3n. Esto termina causando una fuga de memoria:\n\nobjeto sin referencia 0xffff0000281a8200 (tama\u00f1o 2496):\n comm 'softirq', pid 0, jiffies 4295174684\n volcado hexadecimal (primeros 32 bytes):\n 7f 00 00 06 7f 00 00 06 00 00 00 00 cb a8 88 13 ................\n 0a 00 03 61 00 00 00 00 00 00 00 00 00 00 00 00 ...a............\n backtrace (crc 5ebdbe15):\n kmemleak_alloc+0x44/0xe0\n kmem_cache_alloc_noprof+0x248/0x470\n sk_prot_alloc+0x48/0x120\n sk_clone_lock+0x38/0x3b0\n inet_csk_clone_lock+0x34/0x150\n tcp_create_openreq_child+0x3c/0x4a8\n tcp_v6_syn_recv_sock+0x1c0/0x620\n tcp_check_req+0x588/0x790\n tcp_v6_rcv+0x5d0/0xc18\n ip6_protocol_deliver_rcu+0x2d8/0x4c0\n ip6_input_finish+0x74/0x148\n ip6_input+0x50/0x118\n ip6_sublist_rcv+0x2fc/0x3b0\n ipv6_list_rcv+0x114/0x170\n __netif_receive_skb_list_core+0x16c/0x200\n netif_receive_skb_list_internal+0x1f0/0x2d0\n\nEsto se debe a que en tcp_v6_syn_recv_sock (y su contraparte IPv4), al salir por error, inet_csk_prepare_forced_close() y tcp_done() deben ser llamadas. Aseguran que el newsk terminar\u00e1 siendo liberado correctamente.\n\ntcp_v4_syn_recv_sock() lo deja muy claro al tener la etiqueta put_and_exit que se encarga de las cosas. As\u00ed, este parche asegura que tcp_v4_syn_recv_sock y tcp_v6_syn_recv_sock tengan un manejo de errores similar y, por lo tanto, corrige la fuga para TCP-AO."}], "id": "CVE-2025-39852", "lastModified": "2026-10-19T21:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39852", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-14T19:21:28.643713Z", "version": "2.0.3"}}]}, "published": "2025-09-19T16:15:44.090", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d2b356d994a8801acb397cafd28b13672c37ab5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/46d33c878fc0b3d7570366b2c9912395b3f4e701"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fa390321aba0a54d0f7ae95ee4ecde1358bb9234"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-401"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6", "id": "2396931", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2396931"}, "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-772", "details": ["No description is available for this CVE."], "name": "CVE-2025-39852", "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": "Out of support scope", "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": "2025-09-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39852\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39852\nhttps://lore.kernel.org/linux-cve-announce/2025091904-CVE-2025-39852-4209@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-22T09:59:10.012683+00:00", "updated": "2025-09-22T09:59:10.012760+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}