Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access

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Summary

CVECVE-2026-31393
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-03 16:16:37 UTC
Updated2026-04-03 16:16:37 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access l2cap_information_rsp() checks that cmd_len covers the fixed l2cap_info_rsp header (type + result, 4 bytes) but then reads rsp->data without verifying that the payload is present: - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp->data), which reads 4 bytes past the header (needs cmd_len >= 8). - L2CAP_IT_FIXED_CHAN reads rsp->data[0], 1 byte past the header (needs cmd_len >= 5). A truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an out-of-bounds read of adjacent skb data. Guard each data access with the required payload length check. If the payload is too short, skip the read and let the state machine complete with safe defaults (feat_mask and remote_fixed_chan remain zero from kzalloc), so the info timer cleanup and l2cap_conn_start() still run and the connection is not stalled.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4e8402a3f884427f9233ba436459c158d1f2e114 3b646516cba2ebc4b51a72954903326e7c1e443f git Not specified
CNA Linux Linux affected 4e8402a3f884427f9233ba436459c158d1f2e114 807bd1258453c4c83f6ae9dbc1e7b44860ff40d0 git Not specified
CNA Linux Linux affected 4e8402a3f884427f9233ba436459c158d1f2e114 9aeacde4da0f02d42fd968fd32f245828b230171 git Not specified
CNA Linux Linux affected 4e8402a3f884427f9233ba436459c158d1f2e114 e7ff754e339e3d5ce29aa9f95352d0186df8fbd9 git Not specified
CNA Linux Linux affected 4e8402a3f884427f9233ba436459c158d1f2e114 db2872d054e467810078e2b9f440a5b326a601b2 git Not specified
CNA Linux Linux affected 4e8402a3f884427f9233ba436459c158d1f2e114 dd815e6e3918dc75a49aaabac36e4f024d675101 git Not specified
CNA Linux Linux affected 2.6.24 Not specified
CNA Linux Linux unaffected 2.6.24 semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.20 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.10 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3b646516cba2ebc4b51a72954903326e7c1e443f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dd815e6e3918dc75a49aaabac36e4f024d675101 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/807bd1258453c4c83f6ae9dbc1e7b44860ff40d0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9aeacde4da0f02d42fd968fd32f245828b230171 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/db2872d054e467810078e2b9f440a5b326a601b2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e7ff754e339e3d5ce29aa9f95352d0186df8fbd9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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