CVE-2026-31512
Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ aac23bf636593cc2d67144aed373a46a1a5f76b1; < cef09691cfb61f6c91cc27c3d69634f81c8ab949 (affected, git) ≥ aac23bf636593cc2d67144aed373a46a1a5f76b1; < 3340be2bafdcc806f048273ea6d8e82a6597aa1b (affected, git) ≥ aac23bf636593cc2d67144aed373a46a1a5f76b1; < e47315b84d0eb188772c3ff5cf073cdbdefca6b4 (affected, git) ≥ aac23bf636593cc2d67144aed373a46a1a5f76b1; < 477ad4976072056c348937e94f24583321938df4 (affected, git) ≥ aac23bf636593cc2d67144aed373a46a1a5f76b1; < 40c7f7eea2f4d9cb0b3e924254c8c9053372168f (affected, git) ≥ aac23bf636593cc2d67144aed373a46a1a5f76b1; < 8c96f3bd4ae0802db90630be8e9851827e9c9209 (affected, git) ≥ aac23bf636593cc2d67144aed373a46a1a5f76b1; < 5ad981249be52f5e4e92e0e97b436b569071cb86 (affected, git) ≥ aac23bf636593cc2d67144aed373a46a1a5f76b1; < c65bd945d1c08c3db756821b6bf9f1c4a77b29c6 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
3.14 (affected) ≥ 0; < 3.14 (unaffected, semver) ≥ 5.10.253; ≤ 5.10.* (unaffected, semver) ≥ 5.15.203; ≤ 5.15.* (unaffected, semver) ≥ 6.1.168; ≤ 6.1.* (unaffected, semver) ≥ 6.6.131; ≤ 6.6.* (unaffected, semver) ≥ 6.12.80; ≤ 6.12.* (unaffected, semver) ≥ 6.18.21; ≤ 6.18.* (unaffected, semver) ≥ 6.19.11; ≤ 6.19.* (unaffected, semver) ≥ 7.0; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/cef09691cfb61f6c91cc27c3d69634f81c8ab949CNA: Linux
- https://git.kernel.org/stable/c/3340be2bafdcc806f048273ea6d8e82a6597aa1bCNA: Linux
- https://git.kernel.org/stable/c/e47315b84d0eb188772c3ff5cf073cdbdefca6b4CNA: Linux
- https://git.kernel.org/stable/c/477ad4976072056c348937e94f24583321938df4CNA: Linux
- https://git.kernel.org/stable/c/40c7f7eea2f4d9cb0b3e924254c8c9053372168fCNA: Linux
- https://git.kernel.org/stable/c/8c96f3bd4ae0802db90630be8e9851827e9c9209CNA: Linux
- https://git.kernel.org/stable/c/5ad981249be52f5e4e92e0e97b436b569071cb86CNA: Linux
- https://git.kernel.org/stable/c/c65bd945d1c08c3db756821b6bf9f1c4a77b29c6CNA: Linux
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