CVE-2023-53827 (GCVE-0-2023-53827)

Vulnerability from cvelistv5 – Published: 2025-12-09 01:29 – Updated: 2026-10-15 21:41
VLAI
Title
Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp}
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp} Similar to commit d0be8347c623 ("Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put"), just use l2cap_chan_hold_unless_zero to prevent referencing a channel that is about to be destroyed.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:37 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 , < f2d38e77aa5f3effc143e7dd24da8acf02925958 (git)
Affected: 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 , < 1351551aa9058e07a20a27a158270cf84fcde621 (git)
Affected: 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 , < c02421992505c95c7f3c9ad59ee35e22eac60988 (git)
Affected: 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 , < d9ba36c22a7bb09d6bac4cc2f243eff05da53f43 (git)
Affected: 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 , < ac6725a634f7e8c0330610a8527f20c730b61115 (git)
Affected: 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 , < 348d446762e7c70778df8bafbdf3fa0df2123f58 (git)
Affected: 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 , < d82a439c3cfdb28aa7e82e2e849c5c4dd9fca284 (git)
Affected: 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 , < a2a9339e1c9deb7e1e079e12e27a0265aea8421a (git)
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Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 4.14.313 , ≤ 4.14.* (semver)
Unaffected: 4.19.281 , ≤ 4.19.* (semver)
Unaffected: 5.4.241 , ≤ 5.4.* (semver)
Unaffected: 5.10.178 , ≤ 5.10.* (semver)
Unaffected: 5.15.108 , ≤ 5.15.* (semver)
Unaffected: 6.1.25 , ≤ 6.1.* (semver)
Unaffected: 6.2.12 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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            "url": "https://git.kernel.org/stable/c/d9ba36c22a7bb09d6bac4cc2f243eff05da53f43"
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
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      "current_release_date": "2026-11-09T17:29:35+00:00",
      "cve": "CVE-2023-53827",
      "id": "CVE-2023-53827",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "75",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "124",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp}",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53827.json",
      "version": "3"
    },
    "vulnrichment": {
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          {
            "metrics": [
              {
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                  "content": {
                    "id": "CVE-2023-53827",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-15T21:37:31.724293Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-15T21:37:32.351Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "product": "Linux",
              "programFiles": [
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              ],
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              "vendor": "Linux",
              "versions": [
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              "versions": [
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                },
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                  "version": "0",
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                  "versionType": "semver"
                },
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                  "versionType": "semver"
                },
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                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
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                  "status": "unaffected",
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                  "versionType": "semver"
                },
                {
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                  "status": "unaffected",
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                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.25",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.2.*",
                  "status": "unaffected",
                  "version": "6.2.12",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.3",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
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                      "versionEndExcluding": "4.14.313",
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                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                    },
                    {
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                      "vulnerable": true
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "negate": false,
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          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp}\n\nSimilar to commit d0be8347c623 (\"Bluetooth: L2CAP: Fix use-after-free\ncaused by l2cap_chan_put\"), just use l2cap_chan_hold_unless_zero to\nprevent referencing a channel that is about to be destroyed."
            }
          ],
          "metrics": [
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              "cvssV3_1": {
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:A - The vulnerable code is reached only by processing an L2CAP Disconnect Request/Response signalling PDU received from a Bluetooth peer over a BR/EDR ACL or LE link, which requires the attacker to be within Bluetooth radio range. Per kernel scoring guidance, Bluetooth-reachable code is Adjacent.\nAC:L - The attacker drives both sides: it creates and tears down L2CAP channels at will (CONN_REQ/DISCONN_REQ, ECRED reconfigure responses that call l2cap_chan_del with no lock) while flooding disconnect signalling to hit the window where the kref has reached zero but the channel is still on conn-\u003echan_l, and can retry the connect/disconnect cycle indefinitely at no cost. syzbot reproduced the identical pattern in the sibling handler.\nPR:N - l2cap_recv_frame dispatches CID 0x0001/0x0005 straight to the signalling handlers with no security-level, pairing, or encryption check, so an entirely unauthenticated, unpaired in-range device can send the triggering PDU. Fixed channels present on conn-\u003echan_l give a valid target CID without any local socket.\nUI:N - No victim action is needed \u2014 the packet is processed by hci_rx_work as soon as it arrives on a connectable/advertising host with Bluetooth enabled, which is the default on phones, cars, headsets and laptops.\nS:U - The corruption and its consequences are confined to the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The handler reads chan-\u003escid and chan-\u003edcid out of the freed kmalloc-1k object and echoes them to the attacker in the Disconnect Response, giving a repeatable remote leak of reclaimed kernel heap contents, and the broader use-after-free permits arbitrary read via heap grooming.\nI:H - After the increment-on-zero the code performs three indirect calls (chan-\u003eops-\u003eset_shutdown, -\u003eteardown, -\u003eclose) through function pointers read from the freed object plus a list_del on freed list heads, so an attacker who sprays the reclaimed kmalloc-1024 slot obtains control-flow hijack and arbitrary-write primitives.\nA:H - The bug is a KASAN-confirmed use-after-free that mutex_locks freed memory and triggers a refcount_t \"increment on 0\" splat, reliably producing a kernel oops/panic, and it can be re-triggered remotely at will."
                }
              ]
            }
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            "dateUpdated": "2026-08-05T09:16:16.899Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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            },
            {
              "url": "https://git.kernel.org/stable/c/1351551aa9058e07a20a27a158270cf84fcde621"
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            },
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            {
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            {
              "url": "https://git.kernel.org/stable/c/a2a9339e1c9deb7e1e079e12e27a0265aea8421a"
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          "title": "Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp}",
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        "assignerShortName": "Linux",
        "cveId": "CVE-2023-53827",
        "datePublished": "2025-12-09T01:29:40.794Z",
        "dateReserved": "2025-12-09T01:27:17.825Z",
        "dateUpdated": "2026-10-15T21:41:37.002Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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Sightings

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