CVE-2026-31512

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxaac23bf636593cc2d67144aed373a46a1a5f76b1 < cef09691cfb61f6c91cc27c3d69634f81c8ab949affected
LinuxLinuxaac23bf636593cc2d67144aed373a46a1a5f76b1 < 3340be2bafdcc806f048273ea6d8e82a6597aa1baffected
LinuxLinuxaac23bf636593cc2d67144aed373a46a1a5f76b1 < e47315b84d0eb188772c3ff5cf073cdbdefca6b4affected
LinuxLinuxaac23bf636593cc2d67144aed373a46a1a5f76b1 < 477ad4976072056c348937e94f24583321938df4affected
LinuxLinuxaac23bf636593cc2d67144aed373a46a1a5f76b1 < 40c7f7eea2f4d9cb0b3e924254c8c9053372168faffected
LinuxLinuxaac23bf636593cc2d67144aed373a46a1a5f76b1 < 8c96f3bd4ae0802db90630be8e9851827e9c9209affected
LinuxLinuxaac23bf636593cc2d67144aed373a46a1a5f76b1 < 5ad981249be52f5e4e92e0e97b436b569071cb86affected
LinuxLinuxaac23bf636593cc2d67144aed373a46a1a5f76b1 < c65bd945d1c08c3db756821b6bf9f1c4a77b29c6affected
LinuxLinux3.14affected
LinuxLinux0 < 3.14unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.168 <= 6.1.*unaffected
LinuxLinux6.6.131 <= 6.6.*unaffected
LinuxLinux6.12.80 <= 6.12.*unaffected
LinuxLinux6.18.21 <= 6.18.*unaffected
LinuxLinux6.19.11 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References