FKIE_CVE-2026-68117
Vulnerability from fkie_nvd - Published: 2026-08-10 13:19 - Updated: 2026-08-19 17:20
Severity
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 |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/tipc/socket.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "efebc23e9b29e3e5a9e2127dd066929f7f0d315e",
"status": "affected",
"version": "efa78f2ae363428525fb4981bb63c555ee79f3c7",
"versionType": "git"
},
{
"lessThan": "8d6f26d48e61ef34f1921289401dbf36b10816af",
"status": "affected",
"version": "833ecd0eae76eadf81d6d747bb5bc992d1151867",
"versionType": "git"
},
{
"lessThan": "82f59aa27f33bd014a7d8739371ab5712d15e33b",
"status": "affected",
"version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c",
"versionType": "git"
},
{
"lessThan": "b07d87b31631edb6529e6cdcca790a7489d1250d",
"status": "affected",
"version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c",
"versionType": "git"
},
{
"lessThan": "dd29891ed840f6b8d020b759d0dc4a00b1d6e4ea",
"status": "affected",
"version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c",
"versionType": "git"
},
{
"lessThan": "5f5a41a48dbf9eda57b67ce23e548602cf7195a6",
"status": "affected",
"version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c",
"versionType": "git"
},
{
"lessThan": "f9596b1566616a8be0592dbceccb6344a7c6f6bb",
"status": "affected",
"version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c",
"versionType": "git"
},
{
"lessThan": "ba0533fc163f905fe817cfabdf8ed4058da44800",
"status": "affected",
"version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c",
"versionType": "git"
},
{
"status": "affected",
"version": "638fa20b618b2bbcf86da71231624cc82121a036",
"versionType": "git"
},
{
"status": "affected",
"version": "7bc9e7f70bc57d8f02ffea2a42094281effb15ef",
"versionType": "git"
},
{
"status": "affected",
"version": "ef488669b2652bde5b6ee5a409a5b048a2a50db4",
"versionType": "git"
},
{
"status": "affected",
"version": "4919d82f7041157a421ca9bf39a78551d5ad8a1b",
"versionType": "git"
},
{
"status": "affected",
"version": "3b2957fc09fe1ac7f07f40dd50dd5f93e3f3a7a2",
"versionType": "git"
},
{
"lessThan": "5.10.265",
"status": "affected",
"version": "5.10.132",
"versionType": "semver"
},
{
"lessThan": "5.15.216",
"status": "affected",
"version": "5.15.56",
"versionType": "semver"
},
{
"lessThan": "4.10",
"status": "affected",
"version": "4.9.324",
"versionType": "semver"
},
{
"lessThan": "4.15",
"status": "affected",
"version": "4.14.289",
"versionType": "semver"
},
{
"lessThan": "4.20",
"status": "affected",
"version": "4.19.253",
"versionType": "semver"
},
{
"lessThan": "5.5",
"status": "affected",
"version": "5.4.207",
"versionType": "semver"
},
{
"lessThan": "5.19",
"status": "affected",
"version": "5.18.13",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/tipc/socket.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"lessThan": "5.19",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"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)"
}
],
"id": "CVE-2026-68117",
"lastModified": "2026-08-19T17:20:29.370",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-10T13:19:56.690",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/5f5a41a48dbf9eda57b67ce23e548602cf7195a6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/82f59aa27f33bd014a7d8739371ab5712d15e33b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/8d6f26d48e61ef34f1921289401dbf36b10816af"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b07d87b31631edb6529e6cdcca790a7489d1250d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ba0533fc163f905fe817cfabdf8ed4058da44800"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/dd29891ed840f6b8d020b759d0dc4a00b1d6e4ea"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/efebc23e9b29e3e5a9e2127dd066929f7f0d315e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f9596b1566616a8be0592dbceccb6344a7c6f6bb"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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