CVE-2026-43062 (GCVE-0-2026-43062)
Vulnerability from cvelistv5 – Published: 2026-05-05 15:17 – Updated: 2026-08-05 12:25
VLAI
EPSS
VEX
Title
Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()
l2cap_ecred_reconf_rsp() casts the incoming data to struct
l2cap_ecred_conn_rsp (the ECRED *connection* response, 8 bytes with
result at offset 6) instead of struct l2cap_ecred_reconf_rsp (2 bytes
with result at offset 0).
This causes two problems:
- The sizeof(*rsp) length check requires 8 bytes instead of the
correct 2, so valid L2CAP_ECRED_RECONF_RSP packets are rejected
with -EPROTO.
- rsp->result reads from offset 6 instead of offset 0, returning
wrong data when the packet is large enough to pass the check.
Fix by using the correct type. Also pass the already byte-swapped
result variable to BT_DBG instead of the raw __le16 field.
Severity
7.1 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
15f02b91056253e8cdc592888f431da0731337b8 , < 21d3ba696918d6373233aac0b9d51fcabdedddc0
(git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 3b94e62caa1dc1198d0d55d97bd710da1dee15d7 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 111f74547eee8cfedfb854284e80f35c8a491186 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < dd3b221e21079ade8263fbb7176f3d55ad75d3b6 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < d90150c72d2e6a8a3079e88755dafcfbe91c746d (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 5a1ea296f8589ce8f1e3141b2b123b34ad010e19 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < f110b8f58b254bf997cec1bd60701b7798e9bb82 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 15145675690cab2de1056e7ed68e59cbd0452529 (git) |
guessed | |
| Linux | Linux |
Affected:
5.7
Unaffected: 0 , < 5.7 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.20 , ≤ 6.18.* (semver) Unaffected: 6.19.10 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
{
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{
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()\n\nl2cap_ecred_reconf_rsp() casts the incoming data to struct\nl2cap_ecred_conn_rsp (the ECRED *connection* response, 8 bytes with\nresult at offset 6) instead of struct l2cap_ecred_reconf_rsp (2 bytes\nwith result at offset 0).\n\nThis causes two problems:\n\n - The sizeof(*rsp) length check requires 8 bytes instead of the\n correct 2, so valid L2CAP_ECRED_RECONF_RSP packets are rejected\n with -EPROTO.\n\n - rsp-\u003eresult reads from offset 6 instead of offset 0, returning\n wrong data when the packet is large enough to pass the check.\n\nFix by using the correct type. Also pass the already byte-swapped\nresult variable to BT_DBG instead of the raw __le16 field."
}
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{
"lang": "en",
"value": "AV:A - Bluetooth L2CAP is reachable only by a nearby Bluetooth LE peer over the local radio link, not over routed IP networks.\nAC:L - Once an LE L2CAP ECRED channel/reconfiguration exchange exists, the attacker controls the response length and bytes; no hard-to-win race or environmental condition is required to hit the misparse.\nPR:N - The inbound HCI ACL/L2CAP signaling receive path has no local privilege or authentication check before parsing the peer\u0027s ECRED reconfiguration response.\nUI:N - No victim user action is required for packet processing beyond the system participating in a Bluetooth LE L2CAP session.\nS:U - The impact remains within the kernel/Bluetooth stack security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The wrong struct makes the kernel read the result from attacker-controlled packet bytes at offset 6 after an 8-byte length check, so this commit does not expose kernel memory.\nI:H - The bug is a kernel protocol-parser type confusion that lets an adjacent peer drive incorrect ECRED reconfiguration state and channel teardown based on the wrong field; per the supplied guidance, type confusion is scored High for integrity.\nA:L - The practical availability impact is disruption or failure of ECRED reconfiguration/channel state, not a demonstrated kernel panic, hang, or whole-system crash from this fix."
}
]
}
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"providerMetadata": {
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{
"url": "https://git.kernel.org/stable/c/dd3b221e21079ade8263fbb7176f3d55ad75d3b6"
},
{
"url": "https://git.kernel.org/stable/c/d90150c72d2e6a8a3079e88755dafcfbe91c746d"
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{
"url": "https://git.kernel.org/stable/c/15145675690cab2de1056e7ed68e59cbd0452529"
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"title": "Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()",
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"datePublished": "2026-05-05T15:17:27.830Z",
"dateReserved": "2026-05-01T14:12:55.981Z",
"dateUpdated": "2026-08-05T12:25:40.332Z",
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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-02T12:49:41+00:00",
"cve": "CVE-2026-43062",
"id": "CVE-2026-43062",
"initial_release_date": "2026-05-05T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43062.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-31T17:10:33Z",
"cve": "CVE-2026-43062",
"id": "CVE-2026-43062",
"initial_release_date": "2026-05-06T01:40:41Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "554",
"product_status:known_not_affected": "164",
"product_status:recommended": "250",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-43062",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43062.json",
"version": "9"
}
}
}
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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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