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CVE-2026-98457

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Last modified

CVE-2026-98457 is a vulnerability of currently unknown severity. 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.

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a, < 4373ba79a267947e771c438507f7b103e30bdb21; >= 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a, < 965bd88ed4b4763cb765dd65885adcfa588c6b14; >= 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a, < 3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70; >= 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a, < 8c7556c7cd17e073bbefdc4a9a4694a207544c37; >= 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a, < 1fdbb2a712a9a162ee817c959740face80b3d929; >= 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a, < c6a288e6001bcce16553c3853e0f5a45eaaf85c7; >= 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a, < f557274af7b94b6134692e6f26b880f1e34c15bf; >= 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a, < 6c78a213d9070b610c7f418af2c25b66180b7e37
LinuxLinux2.6.32

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98457?
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.
How severe is CVE-2026-98457?
Severity scoring for CVE-2026-98457 is pending analysis.
How do I fix CVE-2026-98457?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST