{
  "cveId": "CVE-2026-64127",
  "url": "https://patchblox.com/security/cve/CVE-2026-64127",
  "summary": "CVE-2026-64127 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-64127, released July 20, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: L2CAP: ecred_reconfigure: send packed...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: L2CAP: ecred_reconfigure: send packed pdu, not stack pointer  Commit 1c08108f3014 (\u0022Bluetooth: L2CAP: Avoid -Wflex-array-member-not-at-end warnings\u0022) converted the on-stack request PDU in l2cap_ecred_reconfigure() from an explicit packed struct to DEFINE_RAW_FLEX(), but did not adjust the size and source-pointer arguments to l2cap_send_cmd():    -    struct {   -            struct l2cap_ecred_reconf_req req;   -            __le16 scid;   -    } pdu;   \u002B    DEFINE_RAW_FLEX(struct l2cap_ecred_reconf_req, pdu, scid, 1);        ...        l2cap_send_cmd(conn, chan-\u003Eident, L2CAP_ECRED_RECONF_REQ,                       sizeof(pdu), \u0026pdu);  After the conversion, DEFINE_RAW_FLEX() expands to declare an anonymous union pdu_u plus a local pointer \u0022pdu\u0022 pointing at it. Therefore:    - sizeof(pdu) is now sizeof(struct l2cap_ecred_reconf_req *) = 8 on     64-bit (4 on 32-bit), not the 6 bytes of (mtu, mps, scid[1]).   - \u0026pdu is the address of the local pointer\u0027s stack storage, not the     address of the request payload.  l2cap_send_cmd() forwards (data, count) to l2cap_build_cmd(), which calls skb_put_data(skb, data, count). The L2CAP_ECRED_RECONFIGURE_REQ packet body therefore contains 8 bytes copied from the kernel stack starting at \u0026pdu -- the 8 bytes overlap the pdu pointer\u0027s value, leaking a kernel stack address to the paired Bluetooth peer. The intended (mtu, mps, scid) fields are not transmitted at all, so the peer rejects the request as malformed and the L2CAP_ECRED_RECONFIGURE feature itself has been broken for the local-side initiator since the introducing commit landed.  The sibling site l2cap_ecred_conn_req() in the same commit was converted correctly (sizeof(*pdu) \u002B len, pdu); only this site was missed.  Restore the original semantics: pass the full flex-struct size via struct_size(pdu, scid, 1) and the pdu pointer (the struct address) as the source.  Validated on a stock 7.0-based host kernel via the real call path: setsockopt(SOL_BLUETOOTH, BT_RCVMTU, ...) on a BT_CONNECTED L2CAP_MODE_EXT_FLOWCTL socket emits an L2CAP_ECRED_RECONFIGURE_REQ whose body is 8 bytes (the on-stack pdu local\u0027s value) rather than the expected 6. Three captures from fresh socket / fresh hciemu peer on the same host -- low bytes vary per call, high 0xffff confirms a kernel virtual address (KASLR-randomised stack slot, not a fixed string):    RECONF_REQ body (ident=0x02 len=8): 42 fb 54 af 0e ca ff ff   RECONF_REQ body (ident=0x02 len=8): 52 3d 2e af 0e ca ff ff   RECONF_REQ body (ident=0x02 len=8): b2 fc 5b af 0e ca ff ff  After this patch the body is 6 bytes carrying the expected little-endian (mtu, mps, scid).",
  "published": "2026-07-19T16:17:54Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00127,
  "epssPercentile": 0.02427,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}