Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ Currently the code attempts to accept requests regardless of the command identifier which may cause multiple requests to be marked as pending (FLAG_DEFER_SETUP) which can cause more than L2CAP_ECRED_MAX_CID(5) to be allocated in l2cap_ecred_rsp_defer causing an overflow. The spec is quite clear that the same identifier shall not be used on subsequent requests: 'Within each signaling channel a different Identifier shall be used for each successive request or indication.' https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-62/out/en/host/logical-link-control-and-adaptation-protocol-specification.html#UUID-32a25a06-4aa4-c6c7-77c5-dcfe3682355d So this attempts to check if there are any channels pending with the same identifier and rejects if any are found.
CVE-2026-23395
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-23395
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "10a7a702542240d5edb2b39450ac951c59ccd009",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "46e5b71666fb7652082e4e214a3365f4b14f1dc3",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "fb4a3a26483f3ea2cd21c7a2f7c45d5670600465",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "2124d82fd25e1671bb3ceb37998af5aae5903e06",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "6b949a6b33cbdf621d9fc6f0c48ac00915dbf514",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "8d0d94f8ba5b3a0beec3b0da558b9bea48018117",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "e72ee455297b794b852e5cea8d2d7bb17312172a",
"versionType": "git"
},
{
"status": "affected",
"version": "15f02b91056253e8cdc592888f431da0731337b8",
"lessThan": "5b3e2052334f2ff6d5200e952f4aa66994d09899",
"versionType": "git"
}
],
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.20",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.10",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23395
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39843 · Revision 1
- Added to Heist Feed
- Publisher date