CVE-2026-31512

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv() l2cap_ecred_data_rcv() reads the SDU length field from skb->data using get_unaligned_le16() without first verifying that skb contains at least L2CAP_SDULEN_SIZE (2) bytes. When skb->len is less than 2, this reads past the valid data in the skb. The ERTM reassembly path correctly calls pskb_may_pull() before reading the SDU length (l2cap_reassemble_sdu, L2CAP_SAR_START case). Apply the same validation to the Enhanced Credit Based Flow Control data path.

References

• https://git.kernel.org/stable/c/3340be2bafdcc806f048273ea6d8e82a6597aa1b
• https://git.kernel.org/stable/c/40c7f7eea2f4d9cb0b3e924254c8c9053372168f
• https://git.kernel.org/stable/c/477ad4976072056c348937e94f24583321938df4
• https://git.kernel.org/stable/c/5ad981249be52f5e4e92e0e97b436b569071cb86
• https://git.kernel.org/stable/c/8c96f3bd4ae0802db90630be8e9851827e9c9209