{
  "cveId": "CVE-2026-31498",
  "url": "https://patchblox.com/security/cve/CVE-2026-31498",
  "summary": "CVE-2026-31498 is fixed in 51 products on 1 platform, first by DEBIAN-CVE-2026-31498, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop  l2cap_config_req() processes CONFIG_REQ for channels in BT_CONNECTED state to support L2CAP reconfiguration (e.g. MTU changes). However, since both CONF_INPUT_DONE and CONF_OUTPUT_DONE are already set from the initial configuration, the reconfiguration path falls through to l2cap_ertm_init(), which re-initializes tx_q, srej_q, srej_list, and retrans_list without freeing the previous allocations and sets chan-\u003Esdu to NULL without freeing the existing skb. This leaks all previously allocated ERTM resources.  Additionally, l2cap_parse_conf_req() does not validate the minimum value of remote_mps derived from the RFC max_pdu_size option. A zero value propagates to l2cap_segment_sdu() where pdu_len becomes zero, causing the while loop to never terminate since len is never decremented, exhausting all available memory.  Fix the double-init by skipping l2cap_ertm_init() and l2cap_chan_ready() when the channel is already in BT_CONNECTED state, while still allowing the reconfiguration parameters to be updated through l2cap_parse_conf_req(). Also add a pdu_len zero check in l2cap_segment_sdu() as a safeguard.",
  "published": "2026-04-22T14:16:48Z",
  "severity": "Important",
  "cvss": 7,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00123,
  "epssPercentile": 0.02057,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31498",
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