Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()

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Summary

CVECVE-2026-31512
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:50 UTC
Updated2026-04-28 15:08:37 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000240000 probability, percentile 0.067930000 (date 2026-04-26)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected aac23bf636593cc2d67144aed373a46a1a5f76b1 cef09691cfb61f6c91cc27c3d69634f81c8ab949 git Not specified
CNA Linux Linux affected aac23bf636593cc2d67144aed373a46a1a5f76b1 3340be2bafdcc806f048273ea6d8e82a6597aa1b git Not specified
CNA Linux Linux affected aac23bf636593cc2d67144aed373a46a1a5f76b1 e47315b84d0eb188772c3ff5cf073cdbdefca6b4 git Not specified
CNA Linux Linux affected aac23bf636593cc2d67144aed373a46a1a5f76b1 477ad4976072056c348937e94f24583321938df4 git Not specified
CNA Linux Linux affected aac23bf636593cc2d67144aed373a46a1a5f76b1 40c7f7eea2f4d9cb0b3e924254c8c9053372168f git Not specified
CNA Linux Linux affected aac23bf636593cc2d67144aed373a46a1a5f76b1 8c96f3bd4ae0802db90630be8e9851827e9c9209 git Not specified
CNA Linux Linux affected aac23bf636593cc2d67144aed373a46a1a5f76b1 5ad981249be52f5e4e92e0e97b436b569071cb86 git Not specified
CNA Linux Linux affected aac23bf636593cc2d67144aed373a46a1a5f76b1 c65bd945d1c08c3db756821b6bf9f1c4a77b29c6 git Not specified
CNA Linux Linux affected 3.14 Not specified
CNA Linux Linux unaffected 3.14 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.131 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e47315b84d0eb188772c3ff5cf073cdbdefca6b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c65bd945d1c08c3db756821b6bf9f1c4a77b29c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/40c7f7eea2f4d9cb0b3e924254c8c9053372168f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8c96f3bd4ae0802db90630be8e9851827e9c9209 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5ad981249be52f5e4e92e0e97b436b569071cb86 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3340be2bafdcc806f048273ea6d8e82a6597aa1b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cef09691cfb61f6c91cc27c3d69634f81c8ab949 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/477ad4976072056c348937e94f24583321938df4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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