CVE-2026-68117 (GCVE-0-2026-68117)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:58 – Updated: 2026-10-19 20:58
VLAI
Title
tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
Summary
In the Linux kernel, the following vulnerability has been resolved: tipc: clear sock->sk on the failed-insert path in tipc_sk_create() When tipc_sk_create() fails to insert the new socket (tipc_sk_insert() returns non-zero), its error path frees the sk with sk_free() but leaves sock->sk pointing at the freed object: if (tipc_sk_insert(tsk)) { sk_free(sk); pr_warn("Socket create failed; port number exhausted\n"); return -EINVAL; } This is harmless for plain socket(): the syscall layer clears sock->ops before releasing, so tipc_release() is never called. It is not harmless on the accept() path. tipc_accept() creates the pre-allocated child socket with tipc_sk_create(net, new_sock, 0, kern); on failure it leaves new_sock->sk dangling and new_sock->ops non-NULL, and do_accept() then fput()s the new file, so __sock_release() -> tipc_release() runs lock_sock(new_sock->sk) on the freed sk -- a use-after-free write of the sk_lock spinlock. tipc_release() already guards this exact "failed accept() releases a pre-allocated child" case with "if (sk == NULL) return 0;", but the guard is bypassed because tipc_sk_create() left sock->sk non-NULL (dangling) rather than NULL. Clear sock->sk on the failed-insert path so the existing tipc_release() NULL check fires and the use-after-free is avoided. The tipc_sk_insert() failure is reached when the per-netns socket rhashtable hits its max_size (tsk_rht_params.max_size = 1048576, ~2M elements) -- i.e. once a netns holds ~2M TIPC sockets every insert returns -E2BIG. BUG: KASAN: slab-use-after-free in lock_sock_nested (net/core/sock.c:3839) Write of size 8 at addr ffff8880047cdc38 by task init/1 lock_sock_nested (net/core/sock.c:3839) tipc_release (net/tipc/socket.c:638) __sock_release (net/socket.c:710) sock_close (net/socket.c:1501) __fput (fs/file_table.c:512) Allocated by task 1: sk_alloc (net/core/sock.c:2308) tipc_sk_create (net/tipc/socket.c:487) tipc_accept (net/tipc/socket.c:2744) do_accept (net/socket.c:2034) Freed by task 1: __sk_destruct (net/core/sock.c:2391) tipc_sk_create (net/tipc/socket.c:504) tipc_accept (net/tipc/socket.c:2744) do_accept (net/socket.c:2034)
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:44 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: efa78f2ae363428525fb4981bb63c555ee79f3c7 , < efebc23e9b29e3e5a9e2127dd066929f7f0d315e (git)
Affected: 833ecd0eae76eadf81d6d747bb5bc992d1151867 , < 8d6f26d48e61ef34f1921289401dbf36b10816af (git)
Affected: 00aff3590fc0a73bddd3b743863c14e76fd35c0c , < 82f59aa27f33bd014a7d8739371ab5712d15e33b (git)
Affected: 00aff3590fc0a73bddd3b743863c14e76fd35c0c , < b07d87b31631edb6529e6cdcca790a7489d1250d (git)
Affected: 00aff3590fc0a73bddd3b743863c14e76fd35c0c , < dd29891ed840f6b8d020b759d0dc4a00b1d6e4ea (git)
Affected: 00aff3590fc0a73bddd3b743863c14e76fd35c0c , < 5f5a41a48dbf9eda57b67ce23e548602cf7195a6 (git)
Affected: 00aff3590fc0a73bddd3b743863c14e76fd35c0c , < f9596b1566616a8be0592dbceccb6344a7c6f6bb (git)
Affected: 00aff3590fc0a73bddd3b743863c14e76fd35c0c , < ba0533fc163f905fe817cfabdf8ed4058da44800 (git)
Affected: 638fa20b618b2bbcf86da71231624cc82121a036 (git)
Affected: 7bc9e7f70bc57d8f02ffea2a42094281effb15ef (git)
Affected: ef488669b2652bde5b6ee5a409a5b048a2a50db4 (git)
Affected: 4919d82f7041157a421ca9bf39a78551d5ad8a1b (git)
Affected: 3b2957fc09fe1ac7f07f40dd50dd5f93e3f3a7a2 (git)
Affected: 5.10.132 , < 5.10.265 (semver)
Affected: 5.15.56 , < 5.15.216 (semver)
Affected: 4.9.324 , < 4.10 (semver)
Affected: 4.14.289 , < 4.15 (semver)
Affected: 4.19.253 , < 4.20 (semver)
Affected: 5.4.207 , < 5.5 (semver)
Affected: 5.18.13 , < 5.19 (semver)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: clear sock-\u003esk on the failed-insert path in tipc_sk_create()\n\nWhen tipc_sk_create() fails to insert the new socket (tipc_sk_insert()\nreturns non-zero), its error path frees the sk with sk_free() but leaves\nsock-\u003esk pointing at the freed object:\n\n\tif (tipc_sk_insert(tsk)) {\n\t\tsk_free(sk);\n\t\tpr_warn(\"Socket create failed; port number exhausted\\n\");\n\t\treturn -EINVAL;\n\t}\n\nThis is harmless for plain socket(): the syscall layer clears sock-\u003eops\nbefore releasing, so tipc_release() is never called. It is not harmless\non the accept() path. tipc_accept() creates the pre-allocated child\nsocket with tipc_sk_create(net, new_sock, 0, kern); on failure it leaves\nnew_sock-\u003esk dangling and new_sock-\u003eops non-NULL, and do_accept() then\nfput()s the new file, so __sock_release() -\u003e tipc_release() runs\nlock_sock(new_sock-\u003esk) on the freed sk -- a use-after-free write of the\nsk_lock spinlock.\n\ntipc_release() already guards this exact \"failed accept() releases a\npre-allocated child\" case with \"if (sk == NULL) return 0;\", but the\nguard is bypassed because tipc_sk_create() left sock-\u003esk non-NULL\n(dangling) rather than NULL.\n\nClear sock-\u003esk on the failed-insert path so the existing tipc_release()\nNULL check fires and the use-after-free is avoided.\n\nThe tipc_sk_insert() failure is reached when the per-netns socket\nrhashtable hits its max_size (tsk_rht_params.max_size = 1048576, ~2M\nelements) -- i.e. once a netns holds ~2M TIPC sockets every insert\nreturns -E2BIG.\n\n  BUG: KASAN: slab-use-after-free in lock_sock_nested (net/core/sock.c:3839)\n  Write of size 8 at addr ffff8880047cdc38 by task init/1\n   lock_sock_nested (net/core/sock.c:3839)\n   tipc_release (net/tipc/socket.c:638)\n   __sock_release (net/socket.c:710)\n   sock_close (net/socket.c:1501)\n   __fput (fs/file_table.c:512)\n  Allocated by task 1:\n   sk_alloc (net/core/sock.c:2308)\n   tipc_sk_create (net/tipc/socket.c:487)\n   tipc_accept (net/tipc/socket.c:2744)\n   do_accept (net/socket.c:2034)\n  Freed by task 1:\n   __sk_destruct (net/core/sock.c:2391)\n   tipc_sk_create (net/tipc/socket.c:504)\n   tipc_accept (net/tipc/socket.c:2744)\n   do_accept (net/socket.c:2034)"
        }
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is hit in tipc_accept() when a listening SOCK_STREAM/SOCK_SEQPACKET socket accepts an incoming TIPC connection; peers reach this path over default UDP/Ethernet bearers (e.g. UDP/6118) without local syscall access.\nAC:L - An attacker can deterministically fill the per-netns TIPC socket rhashtable (~2M entries) by opening many sockets or connections, then trigger the failed-insert accept() cleanup path that performs lock_sock() on the freed sk.\nPR:N - No elevated Linux capabilities are required to create AF_TIPC stream/seqpacket sockets or send unauthenticated TIPC SYN traffic to a listening cluster service; only LSM policy may restrict access.\nUI:N - Exploitation needs no end-user action beyond a server\u2019s normal accept() loop processing inbound TIPC connection requests queued by the network stack.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain; impact is kernel privilege escalation or crash, not a VM/hypervisor or IOMMU boundary crossing.\nC:H - tipc_release() calls lock_sock() on a freed struct sock, a slab use-after-free that can be groomed for arbitrary kernel memory disclosure via controlled reuse of the freed socket object.\nI:H - The UAF performs an 8-byte write to sk_lock on freed memory during socket teardown, enabling heap corruption and potential arbitrary kernel write or code execution primitives.\nA:H - KASAN reports slab-use-after-free in lock_sock_nested during tipc_release on the failed accept() path, causing kernel oops/panic and denial of service even without full exploitation."
            }
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        }
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        "dateUpdated": "2026-08-19T16:29:29.277Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/8d6f26d48e61ef34f1921289401dbf36b10816af"
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        },
        {
          "url": "https://git.kernel.org/stable/c/ba0533fc163f905fe817cfabdf8ed4058da44800"
        }
      ],
      "title": "tipc: clear sock-\u003esk on the failed-insert path in tipc_sk_create()",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: clear sock-\u003esk on the failed-insert path in tipc_sk_create()\n\nWhen tipc_sk_create() fails to insert the new socket (tipc_sk_insert()\nreturns non-zero), its error path frees the sk with sk_free() but leaves\nsock-\u003esk pointing at the freed object:\n\n\tif (tipc_sk_insert(tsk)) {\n\t\tsk_free(sk);\n\t\tpr_warn(\"Socket create failed; port number exhausted\\n\");\n\t\treturn -EINVAL;\n\t}\n\nThis is harmless for plain socket(): the syscall layer clears sock-\u003eops\nbefore releasing, so tipc_release() is never called. It is not harmless\non the accept() path. tipc_accept() creates the pre-allocated child\nsocket with tipc_sk_create(net, new_sock, 0, kern); on failure it leaves\nnew_sock-\u003esk dangling and new_sock-\u003eops non-NULL, and do_accept() then\nfput()s the new file, so __sock_release() -\u003e tipc_release() runs\nlock_sock(new_sock-\u003esk) on the freed sk -- a use-after-free write of the\nsk_lock spinlock.\n\ntipc_release() already guards this exact \"failed accept() releases a\npre-allocated child\" case with \"if (sk == NULL) return 0;\", but the\nguard is bypassed because tipc_sk_create() left sock-\u003esk non-NULL\n(dangling) rather than NULL.\n\nClear sock-\u003esk on the failed-insert path so the existing tipc_release()\nNULL check fires and the use-after-free is avoided.\n\nThe tipc_sk_insert() failure is reached when the per-netns socket\nrhashtable hits its max_size (tsk_rht_params.max_size = 1048576, ~2M\nelements) -- i.e. once a netns holds ~2M TIPC sockets every insert\nreturns -E2BIG.\n\n  BUG: KASAN: slab-use-after-free in lock_sock_nested (net/core/sock.c:3839)\n  Write of size 8 at addr ffff8880047cdc38 by task init/1\n   lock_sock_nested (net/core/sock.c:3839)\n   tipc_release (net/tipc/socket.c:638)\n   __sock_release (net/socket.c:710)\n   sock_close (net/socket.c:1501)\n   __fput (fs/file_table.c:512)\n  Allocated by task 1:\n   sk_alloc (net/core/sock.c:2308)\n   tipc_sk_create (net/tipc/socket.c:487)\n   tipc_accept (net/tipc/socket.c:2744)\n   do_accept (net/socket.c:2034)\n  Freed by task 1:\n   __sk_destruct (net/core/sock.c:2391)\n   tipc_sk_create (net/tipc/socket.c:504)\n   tipc_accept (net/tipc/socket.c:2744)\n   do_accept (net/socket.c:2034)"
          }
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        "id": "CVE-2026-68117",
        "lastModified": "2026-10-19T21:17:51.760",
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                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "5.4.207",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "5.18.13",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: clear sock-\u003esk on the failed-insert path in tipc_sk_create()\n\nWhen tipc_sk_create() fails to insert the new socket (tipc_sk_insert()\nreturns non-zero), its error path frees the sk with sk_free() but leaves\nsock-\u003esk pointing at the freed object:\n\n\tif (tipc_sk_insert(tsk)) {\n\t\tsk_free(sk);\n\t\tpr_warn(\"Socket create failed; port number exhausted\\n\");\n\t\treturn -EINVAL;\n\t}\n\nThis is harmless for plain socket(): the syscall layer clears sock-\u003eops\nbefore releasing, so tipc_release() is never called. It is not harmless\non the accept() path. tipc_accept() creates the pre-allocated child\nsocket with tipc_sk_create(net, new_sock, 0, kern); on failure it leaves\nnew_sock-\u003esk dangling and new_sock-\u003eops non-NULL, and do_accept() then\nfput()s the new file, so __sock_release() -\u003e tipc_release() runs\nlock_sock(new_sock-\u003esk) on the freed sk -- a use-after-free write of the\nsk_lock spinlock.\n\ntipc_release() already guards this exact \"failed accept() releases a\npre-allocated child\" case with \"if (sk == NULL) return 0;\", but the\nguard is bypassed because tipc_sk_create() left sock-\u003esk non-NULL\n(dangling) rather than NULL.\n\nClear sock-\u003esk on the failed-insert path so the existing tipc_release()\nNULL check fires and the use-after-free is avoided.\n\nThe tipc_sk_insert() failure is reached when the per-netns socket\nrhashtable hits its max_size (tsk_rht_params.max_size = 1048576, ~2M\nelements) -- i.e. once a netns holds ~2M TIPC sockets every insert\nreturns -E2BIG.\n\n  BUG: KASAN: slab-use-after-free in lock_sock_nested (net/core/sock.c:3839)\n  Write of size 8 at addr ffff8880047cdc38 by task init/1\n   lock_sock_nested (net/core/sock.c:3839)\n   tipc_release (net/tipc/socket.c:638)\n   __sock_release (net/socket.c:710)\n   sock_close (net/socket.c:1501)\n   __fput (fs/file_table.c:512)\n  Allocated by task 1:\n   sk_alloc (net/core/sock.c:2308)\n   tipc_sk_create (net/tipc/socket.c:487)\n   tipc_accept (net/tipc/socket.c:2744)\n   do_accept (net/socket.c:2034)\n  Freed by task 1:\n   __sk_destruct (net/core/sock.c:2391)\n   tipc_sk_create (net/tipc/socket.c:504)\n   tipc_accept (net/tipc/socket.c:2744)\n   do_accept (net/socket.c:2034)"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - The bug is hit in tipc_accept() when a listening SOCK_STREAM/SOCK_SEQPACKET socket accepts an incoming TIPC connection; peers reach this path over default UDP/Ethernet bearers (e.g. UDP/6118) without local syscall access.\nAC:L - An attacker can deterministically fill the per-netns TIPC socket rhashtable (~2M entries) by opening many sockets or connections, then trigger the failed-insert accept() cleanup path that performs lock_sock() on the freed sk.\nPR:N - No elevated Linux capabilities are required to create AF_TIPC stream/seqpacket sockets or send unauthenticated TIPC SYN traffic to a listening cluster service; only LSM policy may restrict access.\nUI:N - Exploitation needs no end-user action beyond a server\u2019s normal accept() loop processing inbound TIPC connection requests queued by the network stack.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain; impact is kernel privilege escalation or crash, not a VM/hypervisor or IOMMU boundary crossing.\nC:H - tipc_release() calls lock_sock() on a freed struct sock, a slab use-after-free that can be groomed for arbitrary kernel memory disclosure via controlled reuse of the freed socket object.\nI:H - The UAF performs an 8-byte write to sk_lock on freed memory during socket teardown, enabling heap corruption and potential arbitrary kernel write or code execution primitives.\nA:H - KASAN reports slab-use-after-free in lock_sock_nested during tipc_release on the failed accept() path, causing kernel oops/panic and denial of service even without full exploitation."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-19T16:29:29.277Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/efebc23e9b29e3e5a9e2127dd066929f7f0d315e"
            },
            {
              "url": "https://git.kernel.org/stable/c/8d6f26d48e61ef34f1921289401dbf36b10816af"
            },
            {
              "url": "https://git.kernel.org/stable/c/82f59aa27f33bd014a7d8739371ab5712d15e33b"
            },
            {
              "url": "https://git.kernel.org/stable/c/b07d87b31631edb6529e6cdcca790a7489d1250d"
            },
            {
              "url": "https://git.kernel.org/stable/c/dd29891ed840f6b8d020b759d0dc4a00b1d6e4ea"
            },
            {
              "url": "https://git.kernel.org/stable/c/5f5a41a48dbf9eda57b67ce23e548602cf7195a6"
            },
            {
              "url": "https://git.kernel.org/stable/c/f9596b1566616a8be0592dbceccb6344a7c6f6bb"
            },
            {
              "url": "https://git.kernel.org/stable/c/ba0533fc163f905fe817cfabdf8ed4058da44800"
            }
          ],
          "title": "tipc: clear sock-\u003esk on the failed-insert path in tipc_sk_create()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-68117",
        "datePublished": "2026-08-10T11:58:36.675Z",
        "dateReserved": "2026-07-30T09:28:09.369Z",
        "dateUpdated": "2026-10-19T20:58:51.459Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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