CVE-2026-31512
Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()
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.
INFO
Published Date :
April 22, 2026, 2:16 p.m.
Last Modified :
April 22, 2026, 2:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply validation to Enhanced Credit Based Flow Control data path.
- Ensure skb contains at least L2CAP_SDULEN_SIZE bytes.
- Verify PDU length before accessing SDU length field.
References to Advisories, Solutions, and Tools
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CVE-2026-31512.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-31512 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-31512
weaknesses.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 22, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/3340be2bafdcc806f048273ea6d8e82a6597aa1b Added Reference https://git.kernel.org/stable/c/40c7f7eea2f4d9cb0b3e924254c8c9053372168f Added Reference https://git.kernel.org/stable/c/477ad4976072056c348937e94f24583321938df4 Added Reference https://git.kernel.org/stable/c/5ad981249be52f5e4e92e0e97b436b569071cb86 Added Reference https://git.kernel.org/stable/c/8c96f3bd4ae0802db90630be8e9851827e9c9209 Added Reference https://git.kernel.org/stable/c/c65bd945d1c08c3db756821b6bf9f1c4a77b29c6 Added Reference https://git.kernel.org/stable/c/cef09691cfb61f6c91cc27c3d69634f81c8ab949 Added Reference https://git.kernel.org/stable/c/e47315b84d0eb188772c3ff5cf073cdbdefca6b4