CVE-2026-72334 (GCVE-0-2026-72334)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-10-16 18:55
VLAI
EPSS
VEX
Title
Bluetooth: ISO: fix malformed ISO_END/CONT handling
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: ISO: fix malformed ISO_END/CONT handling
Core specification (Part C vol 4 sec 5.4.5) does not exclude empty
ISO_CONT, ISO_END packets. We currently reject them if they are last.
If controller sends malformed sequence
ISO_START -> rx_len = 4, ISO_CONT skb->len 4, ISO_START
that ends payload in ISO_CONT, we leak conn->rx_skb. If controller sends
too long ISO_END, we panic on skb_put. If controller sends too short
ISO_END we accept it.
Fix by marking unfinished ISO_START via conn->rx_skb != NULL. Check
skb->len properly before skb_put. Combine the ISO_CONT/END code paths
as they require the same initial checks. Reject too short ISO_END
packets.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 18:47 UTC
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ccf74f2390d60a2f9a75ef496d2564abb478f46a , < d2df29dc9abda2fc10ff522eac0969f5b77b3637
(git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 7250b6b5ba9b737cff2c2c1d0760360c7b6bca00 (git) Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 49aeb54e3c912ef785311264a51ab9f3698e421b (git) Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 5e53e285f8c989662e34d4938c728a94226bff34 (git) Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 990e65eb9387c4ddfa7f68782b6644c2c35d489f (git) Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < e054c1a6ae7310d2815778fddb87da616e11c255 (git) |
guessed | |
| Linux | Linux |
Affected:
6.0
Unaffected: 0 , < 6.0 (semver) Unaffected: 6.1.189 , ≤ 6.1.* (semver) Unaffected: 6.6.158 , ≤ 6.6.* (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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{
"status": "affected",
"version": "6.0"
},
{
"lessThan": "6.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.189",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.158",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.111",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.53",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"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 malformed ISO_END/CONT handling\n\nCore specification (Part C vol 4 sec 5.4.5) does not exclude empty\nISO_CONT, ISO_END packets. We currently reject them if they are last.\n\nIf controller sends malformed sequence\n\n ISO_START -\u003e rx_len = 4, ISO_CONT skb-\u003elen 4, ISO_START\n\nthat ends payload in ISO_CONT, we leak conn-\u003erx_skb. If controller sends\ntoo long ISO_END, we panic on skb_put. If controller sends too short\nISO_END we accept it.\n\nFix by marking unfinished ISO_START via conn-\u003erx_skb != NULL. Check\nskb-\u003elen properly before skb_put. Combine the ISO_CONT/END code paths\nas they require the same initial checks. Reject too short ISO_END\npackets."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The bug is in iso_recv(), which handles HCI ISO data from the Bluetooth controller during active CIS/BIS ISO transports; a nearby radio peer can deliver malformed ISO fragment sequences without any IP/network path.\nAC:L - An adjacent attacker can reliably craft the malformed ISO_START/ISO_CONT/ISO_END sequences described in the fix (or inject equivalent HCI ISO packets) to trigger skb_put overflow, skb leaks, or acceptance of undersized END fragments.\nPR:N - No Linux credentials are required; an unauthenticated adjacent Bluetooth broadcaster on BIS or CIS peer can drive the vulnerable reassembly path once the victim host has an active ISO connection.\nUI:N - Exploitation does not require a distinct victim action at trigger time; hosts with Bluetooth enabled routinely maintain CIS sessions or background BIS/LE Audio sync that already deliver ISO traffic to iso_recv().\nS:U - Impact is confined to kernel heap corruption and denial of service within the Bluetooth ISO receive path and does not cross VM, container, or IOMMU security boundaries.\nC:H - An oversized ISO_END causes skb_put() to write past the allocated rx_skb buffer (heap overflow), enabling disclosure of adjacent kernel memory per memory-corruption scoring guidance.\nI:H - The skb_put heap overflow writes attacker-controlled ISO payload bytes beyond the skb tail, corrupting adjacent kernel objects and enabling potential arbitrary write or code execution primitives.\nA:H - Oversized ISO_END triggers skb_over_panic (BUG/kernel oops), and repeated malformed sequences leak conn-\u003erx_skb causing memory exhaustion, both producing complete host denial of service."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-03T10:55:50.052Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/d2df29dc9abda2fc10ff522eac0969f5b77b3637"
},
{
"url": "https://git.kernel.org/stable/c/7250b6b5ba9b737cff2c2c1d0760360c7b6bca00"
},
{
"url": "https://git.kernel.org/stable/c/49aeb54e3c912ef785311264a51ab9f3698e421b"
},
{
"url": "https://git.kernel.org/stable/c/5e53e285f8c989662e34d4938c728a94226bff34"
},
{
"url": "https://git.kernel.org/stable/c/990e65eb9387c4ddfa7f68782b6644c2c35d489f"
},
{
"url": "https://git.kernel.org/stable/c/e054c1a6ae7310d2815778fddb87da616e11c255"
}
],
"title": "Bluetooth: ISO: fix malformed ISO_END/CONT handling",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72334",
"datePublished": "2026-08-15T05:55:43.160Z",
"dateReserved": "2026-08-09T03:40:39.920Z",
"dateUpdated": "2026-10-16T18:55:18.395Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.