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 (v2.0.3)
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 06b22ef29591f625ef877ae00d82192938e29e60 , < 46d33c878fc0b3d7570366b2c9912395b3f4e701 (git)
Affected: 06b22ef29591f625ef877ae00d82192938e29e60 , < 3d2b356d994a8801acb397cafd28b13672c37ab5 (git)
Affected: 06b22ef29591f625ef877ae00d82192938e29e60 , < fa390321aba0a54d0f7ae95ee4ecde1358bb9234 (git)
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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)
Create a notification for this product.
Show details on NVD website
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    },
    "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"
    }
  }
}



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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.