CVE-2026-98457

Bluetooth: L2CAP: validate frame length before control and FCS access

State: Published
Severity: Not scored
Published: Oct 18, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 4373ba79a267947e771c438507f7b103e30bdb21Affected 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 965bd88ed4b4763cb765dd65885adcfa588c6b14Affected 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70Affected 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 8c7556c7cd17e073bbefdc4a9a4694a207544c37Affected 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 1fdbb2a712a9a162ee817c959740face80b3d929Affected 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before c6a288e6001bcce16553c3853e0f5a45eaaf85c7Affected 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before f557274af7b94b6134692e6f26b880f1e34c15bfAffected 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 6c78a213d9070b610c7f418af2c25b66180b7e37Affected
LinuxLinux	2.6.32Affected before 2.6.32Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.112 through 6.12.Not affected 6.18.55 through 6.18.Not affected 7.2.9 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 4373ba79a267947e771c438507f7b103e30bdb21Affected
1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 965bd88ed4b4763cb765dd65885adcfa588c6b14Affected
1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70Affected
1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 8c7556c7cd17e073bbefdc4a9a4694a207544c37Affected
1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 1fdbb2a712a9a162ee817c959740face80b3d929Affected
1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before c6a288e6001bcce16553c3853e0f5a45eaaf85c7Affected
1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before f557274af7b94b6134692e6f26b880f1e34c15bfAffected
1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 6c78a213d9070b610c7f418af2c25b66180b7e37Affected

LinuxLinux

2.6.32Affected
before 2.6.32Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.112 through 6.12.*Not affected
6.18.55 through 6.18.*Not affected
7.2.9 through 7.2.*Not affected
7.3 and laterNot affected

References

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