Vulnerability-Lookup

GHSA-JWR7-M8VX-RQM4

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-17 06:33

Details

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: clear iso_data always when detaching conn from hcon

When setting conn->hcon = NULL, also conn->hcon->iso_data = NULL is necessary, otherwise later iso_conn_free() will UAF.

Fix clearing of iso_data in iso_sock_disconn()

Fixes KASAN: slab-use-after-free in iso_conn_hold_unless_zero on iso_sock_release() followed by hci_abort_conn_sync().

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74541"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:59Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: clear iso_data always when detaching conn from hcon\n\nWhen setting conn-\u003ehcon = NULL, also conn-\u003ehcon-\u003eiso_data = NULL is\nnecessary, otherwise later iso_conn_free() will UAF.\n\nFix clearing of iso_data in iso_sock_disconn()\n\nFixes KASAN: slab-use-after-free in iso_conn_hold_unless_zero on\niso_sock_release() followed by hci_abort_conn_sync().",
  "id": "GHSA-jwr7-m8vx-rqm4",
  "modified": "2026-08-17T06:33:51Z",
  "published": "2026-08-15T15:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74541"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63c0f396a18b767eb28e895eb95bbdce6c172c59"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/69a4a7b162b3db6ac337e3094cdee38f24d42ff7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc1d39946d62bc568551dfb81149724de1e91338"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d57e506f6a1e3929611340fae87c1e4823f4d85c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74541 (GCVE-0-2026-74541)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-17 05:48

Title

Bluetooth: ISO: clear iso_data always when detaching conn from hcon

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: clear iso_data always when detaching conn from hcon When setting conn->hcon = NULL, also conn->hcon->iso_data = NULL is necessary, otherwise later iso_conn_free() will UAF. Fix clearing of iso_data in iso_sock_disconn() Fixes KASAN: slab-use-after-free in iso_conn_hold_unless_zero on iso_sock_release() followed by hci_abort_conn_sync().

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

5 references

URL	Tags
https://git.kernel.org/stable/c/cc1d39946d62bc568…
https://git.kernel.org/stable/c/7b51a9c25e9698b64…
https://git.kernel.org/stable/c/63c0f396a18b767eb…
https://git.kernel.org/stable/c/69a4a7b162b3db6ac…
https://git.kernel.org/stable/c/d57e506f6a1e39296…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fbdc4bc47268953c80853489f696e02d61f9a2c6 , < cc1d39946d62bc568551dfb81149724de1e91338 (git) Affected: fbdc4bc47268953c80853489f696e02d61f9a2c6 , < 7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0 (git) Affected: fbdc4bc47268953c80853489f696e02d61f9a2c6 , < 63c0f396a18b767eb28e895eb95bbdce6c172c59 (git) Affected: fbdc4bc47268953c80853489f696e02d61f9a2c6 , < 69a4a7b162b3db6ac337e3094cdee38f24d42ff7 (git) Affected: fbdc4bc47268953c80853489f696e02d61f9a2c6 , < d57e506f6a1e3929611340fae87c1e4823f4d85c (git) Affected: c03a10bd5b6ccb22921e04bcddc987410df7e7a9 (git) Affected: 6.5.12 , < 6.6 (semver)
Linux	Linux	Affected: 6.6 Unaffected: 0 , < 6.6 (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cc1d39946d62bc568551dfb81149724de1e91338",
              "status": "affected",
              "version": "fbdc4bc47268953c80853489f696e02d61f9a2c6",
              "versionType": "git"
            },
            {
              "lessThan": "7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0",
              "status": "affected",
              "version": "fbdc4bc47268953c80853489f696e02d61f9a2c6",
              "versionType": "git"
            },
            {
              "lessThan": "63c0f396a18b767eb28e895eb95bbdce6c172c59",
              "status": "affected",
              "version": "fbdc4bc47268953c80853489f696e02d61f9a2c6",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "fbdc4bc47268953c80853489f696e02d61f9a2c6",
              "versionType": "git"
            },
            {
              "lessThan": "d57e506f6a1e3929611340fae87c1e4823f4d85c",
              "status": "affected",
              "version": "fbdc4bc47268953c80853489f696e02d61f9a2c6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c03a10bd5b6ccb22921e04bcddc987410df7e7a9",
              "versionType": "git"
            },
            {
              "lessThan": "6.6",
              "status": "affected",
              "version": "6.5.12",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.5.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: clear iso_data always when detaching conn from hcon\n\nWhen setting conn-\u003ehcon = NULL, also conn-\u003ehcon-\u003eiso_data = NULL is\nnecessary, otherwise later iso_conn_free() will UAF.\n\nFix clearing of iso_data in iso_sock_disconn()\n\nFixes KASAN: slab-use-after-free in iso_conn_hold_unless_zero on\niso_sock_release() followed by hci_abort_conn_sync()."
        }
      ],
      "metrics": [
        {
          "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 flaw is in the Bluetooth ISO stack (net/bluetooth/iso.c); exploitation occurs during ISO connection teardown reachable from adjacent Bluetooth LE Audio/CIS/BIS deployments on phones, laptops, and embedded systems where ISO HCI traffic is processed wirelessly.\nAC:L - The KASAN reproducer (iso_sock_release() then hci_abort_conn_sync()) is reliably triggered by closing an ISO socket while hci_conn_drop() runs; the attacker controls both the socket lifecycle and concurrent teardown timing without depending on uncontrollable memory layout.\nPR:N - AF_BLUETOOTH/BTPROTO_ISO sockets require no CAP_NET_ADMIN or CAP_NET_RAW; any unprivileged process in init_net can open, connect, and close ISO sockets, and adjacent Bluetooth peers can also dereference the stale hcon-\u003eiso_data via iso_recv() without host credentials.\nUI:N - No victim interaction is required when a malicious or compromised local process creates and closes its own ISO connection to trigger iso_sock_disconn(); exploitation does not depend on mounting filesystems or opening specific user files.\nS:U - The UAF corrupts kernel heap memory during ISO connection teardown, enabling standard local privilege escalation within the kernel security boundary rather than crossing VM, container, or IOMMU isolation boundaries.\nC:H - iso_conn_hold_unless_zero() performs kref_get_unless_zero() on a freed iso_conn slab object, a classic use-after-free that can expose adjacent kernel heap contents and be leveraged for arbitrary kernel memory disclosure.\nI:H - The UAF on iso_conn (containing kref, spinlock, and socket pointers) enables heap spraying and memory corruption primitives that can be chained for arbitrary kernel writes and control-flow hijacking.\nA:H - The bug was confirmed by KASAN as a slab use-after-free in iso_conn_hold_unless_zero during ISO socket release and hci_abort_conn_sync(), which causes kernel oops or panic and denial of service on affected systems."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:48:29.921Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cc1d39946d62bc568551dfb81149724de1e91338"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/63c0f396a18b767eb28e895eb95bbdce6c172c59"
        },
        {
          "url": "https://git.kernel.org/stable/c/69a4a7b162b3db6ac337e3094cdee38f24d42ff7"
        },
        {
          "url": "https://git.kernel.org/stable/c/d57e506f6a1e3929611340fae87c1e4823f4d85c"
        }
      ],
      "title": "Bluetooth: ISO: clear iso_data always when detaching conn from hcon",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74541",
    "datePublished": "2026-08-15T12:27:52.120Z",
    "dateReserved": "2026-08-15T05:44:03.914Z",
    "dateUpdated": "2026-08-17T05:48:29.921Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-JWR7-M8VX-RQM4

CVE-2026-74541 (GCVE-0-2026-74541)

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