CVE-2026-68117 (GCVE-0-2026-68117)
Vulnerability from cvelistv5
Published
2026-08-10 11:58
Modified
2026-08-19 16:29
Severity ?
VLAI Severity ?
EPSS score ?
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)
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: efa78f2ae363428525fb4981bb63c555ee79f3c7 Version: 833ecd0eae76eadf81d6d747bb5bc992d1151867 Version: 00aff3590fc0a73bddd3b743863c14e76fd35c0c Version: 00aff3590fc0a73bddd3b743863c14e76fd35c0c Version: 00aff3590fc0a73bddd3b743863c14e76fd35c0c Version: 00aff3590fc0a73bddd3b743863c14e76fd35c0c Version: 00aff3590fc0a73bddd3b743863c14e76fd35c0c Version: 00aff3590fc0a73bddd3b743863c14e76fd35c0c Version: 638fa20b618b2bbcf86da71231624cc82121a036 Version: 7bc9e7f70bc57d8f02ffea2a42094281effb15ef Version: ef488669b2652bde5b6ee5a409a5b048a2a50db4 Version: 4919d82f7041157a421ca9bf39a78551d5ad8a1b Version: 3b2957fc09fe1ac7f07f40dd50dd5f93e3f3a7a2 Version: 5.10.132 ≤ Version: 5.15.56 ≤ Version: 4.9.324 ≤ Version: 4.14.289 ≤ Version: 4.19.253 ≤ Version: 5.4.207 ≤ Version: 5.18.13 ≤ |
||
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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)"
}
],
"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": "2026-08-19T16:29:29.277Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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