GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2025-39852 (GCVE-0-2025-39852)

Vulnerability from cvelistv5 – Published: 2025-09-19 15:26 – Updated: 2026-05-11 21:37
VLAI
Title
net/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6
Summary
In the Linux kernel, the following vulnerability has been resolved: net/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6 When tcp_ao_copy_all_matching() fails in tcp_v6_syn_recv_sock() it just exits the function. This ends up causing a memory-leak: unreferenced object 0xffff0000281a8200 (size 2496): comm "softirq", pid 0, jiffies 4295174684 hex dump (first 32 bytes): 7f 00 00 06 7f 00 00 06 00 00 00 00 cb a8 88 13 ................ 0a 00 03 61 00 00 00 00 00 00 00 00 00 00 00 00 ...a............ backtrace (crc 5ebdbe15): kmemleak_alloc+0x44/0xe0 kmem_cache_alloc_noprof+0x248/0x470 sk_prot_alloc+0x48/0x120 sk_clone_lock+0x38/0x3b0 inet_csk_clone_lock+0x34/0x150 tcp_create_openreq_child+0x3c/0x4a8 tcp_v6_syn_recv_sock+0x1c0/0x620 tcp_check_req+0x588/0x790 tcp_v6_rcv+0x5d0/0xc18 ip6_protocol_deliver_rcu+0x2d8/0x4c0 ip6_input_finish+0x74/0x148 ip6_input+0x50/0x118 ip6_sublist_rcv+0x2fc/0x3b0 ipv6_list_rcv+0x114/0x170 __netif_receive_skb_list_core+0x16c/0x200 netif_receive_skb_list_internal+0x1f0/0x2d0 This is because in tcp_v6_syn_recv_sock (and the IPv4 counterpart), when exiting upon error, inet_csk_prepare_forced_close() and tcp_done() need to be called. They make sure the newsk will end up being correctly free'd. tcp_v4_syn_recv_sock() makes this very clear by having the put_and_exit label that takes care of things. So, this patch here makes sure tcp_v4_syn_recv_sock and tcp_v6_syn_recv_sock have similar error-handling and thus fixes the leak for TCP-AO.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 19:21 UTC
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 06b22ef29591f625ef877ae00d82192938e29e60 , < 46d33c878fc0b3d7570366b2c9912395b3f4e701 (git)
Affected: 06b22ef29591f625ef877ae00d82192938e29e60 , < 3d2b356d994a8801acb397cafd28b13672c37ab5 (git)
Affected: 06b22ef29591f625ef877ae00d82192938e29e60 , < fa390321aba0a54d0f7ae95ee4ecde1358bb9234 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.12.46 , ≤ 6.12.* (semver)
Unaffected: 6.16.6 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-39852",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-14T19:21:28.643713Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-401",
                "description": "CWE-401 Missing Release of Memory after Effective Lifetime",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-14T19:23:12.597Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.46",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.6",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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\u0027d.\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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:37:41.374Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39852",
    "datePublished": "2025-09-19T15:26:24.312Z",
    "dateReserved": "2025-04-16T07:20:57.142Z",
    "dateUpdated": "2026-05-11T21:37:41.374Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-39852",
      "date": "2026-09-16",
      "epss": "0.00144",
      "percentile": "0.04085"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39852\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-19T16:15:44.090\",\"lastModified\":\"2026-06-17T09:18:37.690\",\"vulnStatus\":\"Modified\",\"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\u0027d.\\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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/tcp_ipv6.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"06b22ef29591f625ef877ae00d82192938e29e60\",\"lessThan\":\"46d33c878fc0b3d7570366b2c9912395b3f4e701\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"06b22ef29591f625ef877ae00d82192938e29e60\",\"lessThan\":\"3d2b356d994a8801acb397cafd28b13672c37ab5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"06b22ef29591f625ef877ae00d82192938e29e60\",\"lessThan\":\"fa390321aba0a54d0f7ae95ee4ecde1358bb9234\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/tcp_ipv6.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.46\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16.6\",\"lessThanOrEqual\":\"6.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-01-14T19:21:28.643713Z\",\"id\":\"CVE-2025-39852\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.46\",\"matchCriteriaId\":\"F7E2B332-E920-4CAC-B400-288602DB6F16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.16.6\",\"matchCriteriaId\":\"548F104C-0F08-438B-9C97-64C903F0C678\"},{\"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\"}]}]}],\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T01:23:37+00:00",
      "cve": "CVE-2025-39852",
      "id": "CVE-2025-39852",
      "initial_release_date": "2025-09-19T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39852.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T16:57:33Z",
      "cve": "CVE-2025-39852",
      "id": "CVE-2025-39852",
      "initial_release_date": "2025-09-22T23:22:48Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "72",
      "product_status:known_not_affected": "473",
      "product_status:recommended": "154",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39852",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39852.json",
      "version": "28"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"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\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T19:21:23.170Z\"}}], \"cna\": {\"title\": \"net/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"06b22ef29591f625ef877ae00d82192938e29e60\", \"lessThan\": \"46d33c878fc0b3d7570366b2c9912395b3f4e701\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"06b22ef29591f625ef877ae00d82192938e29e60\", \"lessThan\": \"3d2b356d994a8801acb397cafd28b13672c37ab5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"06b22ef29591f625ef877ae00d82192938e29e60\", \"lessThan\": \"fa390321aba0a54d0f7ae95ee4ecde1358bb9234\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv6/tcp_ipv6.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.12.46\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.16.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.16.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv6/tcp_ipv6.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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\u0027d.\\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\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.