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CVE PROGRAM SOURCE RECORD8.1 High

CVE-2026-31393

Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 4e8402a3f884427f9233ba436459c158d1f2e114 to < 187e6fe939295be36063a1d91f8bebee04399a8caffected
  • 4e8402a3f884427f9233ba436459c158d1f2e114 to < 5229e7d15771eac2b5886bfb1f976aea0c1eec14affected
  • 4e8402a3f884427f9233ba436459c158d1f2e114 to < 3b646516cba2ebc4b51a72954903326e7c1e443faffected
  • 4e8402a3f884427f9233ba436459c158d1f2e114 to < 807bd1258453c4c83f6ae9dbc1e7b44860ff40d0affected
  • 4e8402a3f884427f9233ba436459c158d1f2e114 to < 9aeacde4da0f02d42fd968fd32f245828b230171affected
  • 4e8402a3f884427f9233ba436459c158d1f2e114 to < e7ff754e339e3d5ce29aa9f95352d0186df8fbd9affected
  • 4e8402a3f884427f9233ba436459c158d1f2e114 to < db2872d054e467810078e2b9f440a5b326a601b2affected
  • 4e8402a3f884427f9233ba436459c158d1f2e114 to < dd815e6e3918dc75a49aaabac36e4f024d675101affected

Linux Linux

Default version status: affected

  • 2.6.24affected
  • 0 to < 2.6.24unaffected
  • 5.10.253 to ≤ 5.10.*unaffected
  • 5.15.203 to ≤ 5.15.*unaffected
  • 6.1.167 to ≤ 6.1.*unaffected
  • 6.6.130 to ≤ 6.6.*unaffected
  • 6.12.78 to ≤ 6.12.*unaffected
  • 6.18.20 to ≤ 6.18.*unaffected
  • 6.19.10 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References