CVE-2026-90088 (GCVE-0-2026-90088)
Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-10-19 08:57
VLAI
EPSS
VEX
Title
Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop
rfcomm_apply_pn() accepts the MTU value from a remote PN (Parameter
Negotiation) frame without checking for zero. When the remote peer
sends an MTU of zero, d->mtu is set to 0. This causes the sendmsg
path to enter an infinite loop when fragmenting data, as each fragment
has size == min_t(size_t, len, 0) == 0, so the remaining length never
decreases. The infinite allocation of zero-length skbs exhausts all
system memory.
Fix by clamping d->mtu to RFCOMM_DEFAULT_MTU when the negotiated
value is zero, consistent with the initial value assigned in
rfcomm_dlc_alloc().
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e7c0aa45ae6c5a338661b23812bfcdef50bf3e96
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cbc2962da99b6b89345267d3aa74b4b573340548 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9b2e5f1928c99224345a9ed8c5dae5fc74964d6d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fc4851ff8dfb505e9a19efcc286712132bbd178d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f561e44261344adadf9d6a6dff31e3af9776d5c6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aeee917a4878af95f0c63e18c5f22eaf6299c7b8 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3988cbb1be501dbff909a2ee024670e3c955a66d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 44c98fd082eafd49d55a8a4077ff488175b2fe24 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
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},
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"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.270",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.270",
"versionStartIncluding": "2.6.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.221",
"versionStartIncluding": "2.6.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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}
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"negate": false,
"operator": "OR"
}
]
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop\n\nrfcomm_apply_pn() accepts the MTU value from a remote PN (Parameter\nNegotiation) frame without checking for zero. When the remote peer\nsends an MTU of zero, d-\u003emtu is set to 0. This causes the sendmsg\npath to enter an infinite loop when fragmenting data, as each fragment\nhas size == min_t(size_t, len, 0) == 0, so the remaining length never\ndecreases. The infinite allocation of zero-length skbs exhausts all\nsystem memory.\n\nFix by clamping d-\u003emtu to RFCOMM_DEFAULT_MTU when the negotiated\nvalue is zero, consistent with the initial value assigned in\nrfcomm_dlc_alloc()."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T08:57:45.766Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e7c0aa45ae6c5a338661b23812bfcdef50bf3e96"
},
{
"url": "https://git.kernel.org/stable/c/cbc2962da99b6b89345267d3aa74b4b573340548"
},
{
"url": "https://git.kernel.org/stable/c/9b2e5f1928c99224345a9ed8c5dae5fc74964d6d"
},
{
"url": "https://git.kernel.org/stable/c/fc4851ff8dfb505e9a19efcc286712132bbd178d"
},
{
"url": "https://git.kernel.org/stable/c/f561e44261344adadf9d6a6dff31e3af9776d5c6"
},
{
"url": "https://git.kernel.org/stable/c/aeee917a4878af95f0c63e18c5f22eaf6299c7b8"
},
{
"url": "https://git.kernel.org/stable/c/3988cbb1be501dbff909a2ee024670e3c955a66d"
},
{
"url": "https://git.kernel.org/stable/c/44c98fd082eafd49d55a8a4077ff488175b2fe24"
}
],
"title": "Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-90088",
"datePublished": "2026-09-17T16:06:03.527Z",
"dateReserved": "2026-09-11T19:38:34.785Z",
"dateUpdated": "2026-10-19T08:57:45.766Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-90088",
"date": "2026-11-01",
"epss": "0.00216",
"percentile": "0.12131"
},
"microsoft_vex": {
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"cve": "CVE-2026-90088",
"id": "msrc_CVE-2026-90088",
"initial_release_date": "2026-09-19T01:08:17.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "2",
"product_status:under_investigation": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90088.json",
"version": "6"
},
"nvd": {
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"product": "Linux",
"programFiles": [
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],
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},
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},
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}
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},
{
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "2.6.12"
},
{
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{
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"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.15.221",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
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"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"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\nBluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop\n\nrfcomm_apply_pn() accepts the MTU value from a remote PN (Parameter\nNegotiation) frame without checking for zero. When the remote peer\nsends an MTU of zero, d-\u003emtu is set to 0. This causes the sendmsg\npath to enter an infinite loop when fragmenting data, as each fragment\nhas size == min_t(size_t, len, 0) == 0, so the remaining length never\ndecreases. The infinite allocation of zero-length skbs exhausts all\nsystem memory.\n\nFix by clamping d-\u003emtu to RFCOMM_DEFAULT_MTU when the negotiated\nvalue is zero, consistent with the initial value assigned in\nrfcomm_dlc_alloc()."
}
],
"id": "CVE-2026-90088",
"lastModified": "2026-10-19T09:18:57.763",
"metrics": {},
"published": "2026-09-17T17:16:59.880",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3988cbb1be501dbff909a2ee024670e3c955a66d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/44c98fd082eafd49d55a8a4077ff488175b2fe24"
},
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"url": "https://git.kernel.org/stable/c/9b2e5f1928c99224345a9ed8c5dae5fc74964d6d"
},
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"url": "https://git.kernel.org/stable/c/aeee917a4878af95f0c63e18c5f22eaf6299c7b8"
},
{
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"url": "https://git.kernel.org/stable/c/cbc2962da99b6b89345267d3aa74b4b573340548"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e7c0aa45ae6c5a338661b23812bfcdef50bf3e96"
},
{
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"url": "https://git.kernel.org/stable/c/f561e44261344adadf9d6a6dff31e3af9776d5c6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/fc4851ff8dfb505e9a19efcc286712132bbd178d"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-10-17T21:16:57+00:00",
"cve": "CVE-2026-90088",
"id": "CVE-2026-90088",
"initial_release_date": "2026-09-17T00:00:00+00:00",
"product_status:known_affected": "277",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90088.json",
"version": "3"
}
}
}
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