CVE-2026-53254 (GCVE-0-2026-53254)
Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:40
VLAI?
Title
Bluetooth: RFCOMM: validate skb length in MCC handlers
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: RFCOMM: validate skb length in MCC handlers
The RFCOMM MCC handlers cast skb->data to protocol-specific structs
without validating skb->len first. A malicious remote device can send
truncated MCC frames and trigger out-of-bounds reads in these handlers.
Fix this by using skb_pull_data() to validate and access the required
data before dereferencing it.
rfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows
1-byte RPN requests. Handle this by validating only the DLCI byte first,
and validating the full struct only when len > 1.
Severity ?
8.1 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7c15c7c2878957cbfed93bcc29c13fdace464254
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0d637136ce89f9a2309b2c3502402ce400dab0ef (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 98377e6b1a1a56561ec66a181573ea2b61b2079e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3eabc6d47a0ad22b053329997aaf0ec1e581e392 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 23882b828c3c8c51d0c946446a396b10abb3b16b (git) |
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{
"containers": {
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"programFiles": [
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"version": "2.6.12"
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
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"version": "6.18.36",
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},
{
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"status": "unaffected",
"version": "7.0.13",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: validate skb length in MCC handlers\n\nThe RFCOMM MCC handlers cast skb-\u003edata to protocol-specific structs\nwithout validating skb-\u003elen first. A malicious remote device can send\ntruncated MCC frames and trigger out-of-bounds reads in these handlers.\n\nFix this by using skb_pull_data() to validate and access the required\ndata before dereferencing it.\n\nrfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows\n1-byte RPN requests. Handle this by validating only the DLCI byte first,\nand validating the full struct only when len \u003e 1."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-28T06:40:59.075Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/7c15c7c2878957cbfed93bcc29c13fdace464254"
},
{
"url": "https://git.kernel.org/stable/c/0d637136ce89f9a2309b2c3502402ce400dab0ef"
},
{
"url": "https://git.kernel.org/stable/c/98377e6b1a1a56561ec66a181573ea2b61b2079e"
},
{
"url": "https://git.kernel.org/stable/c/1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c"
},
{
"url": "https://git.kernel.org/stable/c/3eabc6d47a0ad22b053329997aaf0ec1e581e392"
},
{
"url": "https://git.kernel.org/stable/c/08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997"
},
{
"url": "https://git.kernel.org/stable/c/23882b828c3c8c51d0c946446a396b10abb3b16b"
}
],
"title": "Bluetooth: RFCOMM: validate skb length in MCC handlers",
"x_generator": {
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}
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"cveMetadata": {
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"cveId": "CVE-2026-53254",
"datePublished": "2026-06-25T08:39:45.273Z",
"dateReserved": "2026-06-09T07:44:35.394Z",
"dateUpdated": "2026-06-28T06:40:59.075Z",
"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 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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