Bluetooth: L2CAP: validate frame length before control and FCS access
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: validate frame length before control and FCS access l2cap_data_rcv() unpacks either a two-byte or four-byte control field without first ensuring that it is present. A short ERTM or streaming-mode frame can therefore cause an out-of-bounds read. There is a second short-frame case when CRC16 is enabled. After the control field is pulled, l2cap_check_fcs() subtracts two from skb->len without checking it. If fewer than two bytes remain, the subtraction wraps; skb_trim() leaves the buffer unchanged and the subsequent FCS load reads past the logical end of the frame. Validate that the frame contains both its control field and, when enabled, its FCS before either field is accessed.
CVE-2026-98457
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-2026-98457
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": "1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a",
"lessThan": "4373ba79a267947e771c438507f7b103e30bdb21",
"versionType": "git"
},
{
"status": "affected",
"version": "1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a",
"lessThan": "965bd88ed4b4763cb765dd65885adcfa588c6b14",
"versionType": "git"
},
{
"status": "affected",
"version": "1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a",
"lessThan": "3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70",
"versionType": "git"
},
{
"status": "affected",
"version": "1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a",
"lessThan": "8c7556c7cd17e073bbefdc4a9a4694a207544c37",
"versionType": "git"
},
{
"status": "affected",
"version": "1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a",
"lessThan": "1fdbb2a712a9a162ee817c959740face80b3d929",
"versionType": "git"
},
{
"status": "affected",
"version": "1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a",
"lessThan": "c6a288e6001bcce16553c3853e0f5a45eaaf85c7",
"versionType": "git"
},
{
"status": "affected",
"version": "1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a",
"lessThan": "f557274af7b94b6134692e6f26b880f1e34c15bf",
"versionType": "git"
},
{
"status": "affected",
"version": "1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a",
"lessThan": "6c78a213d9070b610c7f418af2c25b66180b7e37",
"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": "2.6.32"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.32",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98457
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38510 · Revision 1
- Added to Heist Feed
- Publisher date