CVE-2026-80914 (GCVE-0-2026-80914)
Vulnerability from cvelistv5 – Published: 2026-09-09 16:10 – Updated: 2026-09-09 16:10
VLAI
EPSS
VEX
Title
Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready
iso_conn_ready() looks up the BIS listener socket with iso_get_sock(),
which takes a reference, and then, without re-checking its state,
creates a child socket from it:
parent = iso_get_sock(hdev, ...);
if (!parent)
return;
lock_sock(parent);
sk = iso_sock_alloc(sock_net(parent), NULL, BTPROTO_ISO, ...);
...
iso_chan_add(conn, sk, parent);
...
release_sock(parent);
sock_put(parent);
If the listener socket is closed concurrently, between iso_get_sock()
and lock_sock(), the reference taken by iso_get_sock() may be the last
one: the close path drops the link-list reference, and once
iso_conn_ready() drops its own reference at the end of the function the
socket is freed. The child socket, however, is already linked to the
freed parent, and a later disconnect of the child runs iso_chan_del()
-> bt_accept_unlink(), which dereferences the dangling parent pointer
into the freed accept queue (a use-after-free). The same dangling
pointer is also dereferenced through parent->***() in
iso_chan_del().
Fix it the same way the connected (non-BIS) path was fixed in commit
0d255e63fcf3 ("Bluetooth: ISO: hold sk properly in iso_conn_ready"):
after taking the socket lock, re-check that the parent is still a
listening, alive socket, and bail out otherwise.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 2387cd06a2c0b416f05028b02bba1089f54c28d9
(git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 49fd7116f76b860b230843700fb7423ab5331e1f (git) Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 03288b7447c9e572f8ab82fc29cfb4ca719ab210 (git) Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 560bef609fa5992745929e8d7d458b9d88dd2830 (git) |
guessed | |
| Linux | Linux |
Affected:
6.0
Unaffected: 0 , < 6.0 (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/bluetooth/iso.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "2387cd06a2c0b416f05028b02bba1089f54c28d9",
"status": "affected",
"version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
"versionType": "git"
},
{
"lessThan": "49fd7116f76b860b230843700fb7423ab5331e1f",
"status": "affected",
"version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
"versionType": "git"
},
{
"lessThan": "03288b7447c9e572f8ab82fc29cfb4ca719ab210",
"status": "affected",
"version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
"versionType": "git"
},
{
"lessThan": "560bef609fa5992745929e8d7d458b9d88dd2830",
"status": "affected",
"version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/bluetooth/iso.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.0"
},
{
"lessThan": "6.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.109",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.50",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.4",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3-rc1",
"versionStartIncluding": "6.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready\n\niso_conn_ready() looks up the BIS listener socket with iso_get_sock(),\nwhich takes a reference, and then, without re-checking its state,\ncreates a child socket from it:\n\n parent = iso_get_sock(hdev, ...);\n if (!parent)\n return;\n\n lock_sock(parent);\n sk = iso_sock_alloc(sock_net(parent), NULL, BTPROTO_ISO, ...);\n ...\n iso_chan_add(conn, sk, parent);\n ...\n release_sock(parent);\n sock_put(parent);\n\nIf the listener socket is closed concurrently, between iso_get_sock()\nand lock_sock(), the reference taken by iso_get_sock() may be the last\none: the close path drops the link-list reference, and once\niso_conn_ready() drops its own reference at the end of the function the\nsocket is freed. The child socket, however, is already linked to the\nfreed parent, and a later disconnect of the child runs iso_chan_del()\n-\u003e bt_accept_unlink(), which dereferences the dangling parent pointer\ninto the freed accept queue (a use-after-free). The same dangling\npointer is also dereferenced through parent-\u003e***() in\niso_chan_del().\n\nFix it the same way the connected (non-BIS) path was fixed in commit\n0d255e63fcf3 (\"Bluetooth: ISO: hold sk properly in iso_conn_ready\"):\nafter taking the socket lock, re-check that the parent is still a\nlistening, alive socket, and bail out otherwise."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-09T16:10:58.675Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/2387cd06a2c0b416f05028b02bba1089f54c28d9"
},
{
"url": "https://git.kernel.org/stable/c/49fd7116f76b860b230843700fb7423ab5331e1f"
},
{
"url": "https://git.kernel.org/stable/c/03288b7447c9e572f8ab82fc29cfb4ca719ab210"
},
{
"url": "https://git.kernel.org/stable/c/560bef609fa5992745929e8d7d458b9d88dd2830"
}
],
"title": "Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80914",
"datePublished": "2026-09-09T16:10:58.675Z",
"dateReserved": "2026-08-26T14:34:25.801Z",
"dateUpdated": "2026-09-09T16:10:58.675Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-80914\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-09T17:17:46.263\",\"lastModified\":\"2026-09-09T17:17:46.263\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready\\n\\niso_conn_ready() looks up the BIS listener socket with iso_get_sock(),\\nwhich takes a reference, and then, without re-checking its state,\\ncreates a child socket from it:\\n\\n parent = iso_get_sock(hdev, ...);\\n if (!parent)\\n return;\\n\\n lock_sock(parent);\\n sk = iso_sock_alloc(sock_net(parent), NULL, BTPROTO_ISO, ...);\\n ...\\n iso_chan_add(conn, sk, parent);\\n ...\\n release_sock(parent);\\n sock_put(parent);\\n\\nIf the listener socket is closed concurrently, between iso_get_sock()\\nand lock_sock(), the reference taken by iso_get_sock() may be the last\\none: the close path drops the link-list reference, and once\\niso_conn_ready() drops its own reference at the end of the function the\\nsocket is freed. The child socket, however, is already linked to the\\nfreed parent, and a later disconnect of the child runs iso_chan_del()\\n-\u003e bt_accept_unlink(), which dereferences the dangling parent pointer\\ninto the freed accept queue (a use-after-free). The same dangling\\npointer is also dereferenced through parent-\u003e***() in\\niso_chan_del().\\n\\nFix it the same way the connected (non-BIS) path was fixed in commit\\n0d255e63fcf3 (\\\"Bluetooth: ISO: hold sk properly in iso_conn_ready\\\"):\\nafter taking the socket lock, re-check that the parent is still a\\nlistening, alive socket, and bail out otherwise.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/iso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"2387cd06a2c0b416f05028b02bba1089f54c28d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"49fd7116f76b860b230843700fb7423ab5331e1f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"03288b7447c9e572f8ab82fc29cfb4ca719ab210\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"560bef609fa5992745929e8d7d458b9d88dd2830\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/iso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03288b7447c9e572f8ab82fc29cfb4ca719ab210\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2387cd06a2c0b416f05028b02bba1089f54c28d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/49fd7116f76b860b230843700fb7423ab5331e1f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/560bef609fa5992745929e8d7d458b9d88dd2830\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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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