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Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success l2cap_ecred_reconf_rsp() returns early on success without clearing chan->ident. Every other L2CAP response handler (l2cap_ecred_conn_rsp, l2cap_le_connect_rsp, l2cap_config_rsp) clears chan->ident after a successful transaction to prevent the channel from matching subsequent responses with the recycled ident value. A remote attacker that completed a reconfiguration as the peer can replay a failure response with the stale ident, causing the kernel to match and destroy the already-established channel via l2cap_chan_del(chan, ECONNRESET). Clear chan->ident for all matching channels on success, and harden the failure path by using l2cap_chan_hold_unless_zero() consistent with other L2CAP handlers (l2cap_le_command_rej, __l2cap_get_chan_by_ident).

Announced Group revision 1
Original source ↗

CVE-2026-63976

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-63976

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "59f5ecf6ad5c4db6ae81965a96156954a3b0d89a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "ae0152d77d101c920769934fb102b18de0c6f526",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "c2afd2613fda90107c5e2fe8e855627451749c78",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "cc2b4f749de09975bfa06e58bbbad2f6acd4c79c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "3b5b5f423b4fd23404a393bda8adba3cd6f74ef1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "f39049304ba655ffcbb92edbdf8c51a1f1210bed",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "8e7977afaef37c6bd2b2654f1bce6ab40d471147",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "15f02b91056253e8cdc592888f431da0731337b8",
        "lessThan": "00e1950716c6ed67d74777b2db286b0fa23b4be9",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bluetooth/l2cap_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.93",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.35",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.12",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/l2cap_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-63976

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40915 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-63976 · Revision 1Source updated