Vulnerability-Lookup

FKIE_CVE-2025-38593

Vulnerability from fkie_nvd - Published: 2025-08-19 17:15 - Updated: 2026-10-15 22:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()' Function 'hci_discovery_filter_clear()' frees 'uuids' array and then sets it to NULL. There is a tiny chance of the following race: 'hci_cmd_sync_work()' 'update_passive_scan_sync()' 'hci_update_passive_scan_sync()' 'hci_discovery_filter_clear()' kfree(uuids); <-------------------------preempted--------------------------------> 'start_service_discovery()' 'hci_discovery_filter_clear()' kfree(uuids); // DOUBLE FREE <-------------------------preempted--------------------------------> uuids = NULL; To fix it let's add locking around 'kfree()' call and NULL pointer assignment. Otherwise the following backtrace fires: [ ] ------------[ cut here ]------------ [ ] kernel BUG at mm/slub.c:547! [ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP [ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1 [ ] Tainted: [O]=OOT_MODULE [ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ ] pc : __slab_free+0xf8/0x348 [ ] lr : __slab_free+0x48/0x348 ... [ ] Call trace: [ ] __slab_free+0xf8/0x348 [ ] kfree+0x164/0x27c [ ] start_service_discovery+0x1d0/0x2c0 [ ] hci_sock_sendmsg+0x518/0x924 [ ] __sock_sendmsg+0x54/0x60 [ ] sock_write_iter+0x98/0xf8 [ ] do_iter_readv_writev+0xe4/0x1c8 [ ] vfs_writev+0x128/0x2b0 [ ] do_writev+0xfc/0x118 [ ] __arm64_sys_writev+0x20/0x2c [ ] invoke_syscall+0x68/0xf0 [ ] el0_svc_common.constprop.0+0x40/0xe0 [ ] do_el0_svc+0x1c/0x28 [ ] el0_svc+0x30/0xd0 [ ] el0t_64_sync_handler+0x100/0x12c [ ] el0t_64_sync+0x194/0x198 [ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000) [ ] ---[ end trace 0000000000000000 ]---

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/16852eccbdfaf41a666705e3f8be55cf2864c5ca	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2935e556850e9c94d7a00adf14d3cd7fe406ac03	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7ce9bb0b95fc280e9212b8922590c492ca1d9c39	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/86f3dcd1f331cfd4fd7ec88906955134ec51afbe
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a351ff6b8ecca4229afaa0d98042bead8de64799	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f8069f34c4c976786ded97498012225af87435d7	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "86f3dcd1f331cfd4fd7ec88906955134ec51afbe",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            },
            {
              "lessThan": "7ce9bb0b95fc280e9212b8922590c492ca1d9c39",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            },
            {
              "lessThan": "16852eccbdfaf41a666705e3f8be55cf2864c5ca",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            },
            {
              "lessThan": "a351ff6b8ecca4229afaa0d98042bead8de64799",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            },
            {
              "lessThan": "f8069f34c4c976786ded97498012225af87435d7",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            },
            {
              "lessThan": "2935e556850e9c94d7a00adf14d3cd7fe406ac03",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.159",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F49D8AA9-5368-43A4-94F6-B809322B4E8F",
              "versionEndExcluding": "6.6.117",
              "versionStartIncluding": "5.17",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "EA7AA5E6-4376-4A85-A021-6ACC5FF801C3",
              "versionEndExcluding": "6.12.42",
              "versionStartIncluding": "6.7",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "5890C690-B295-40C2-9121-FF5F987E5142",
              "versionEndExcluding": "6.15.10",
              "versionStartIncluding": "6.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "58182352-D7DF-4CC9-841E-03C1D852C3FB",
              "versionEndExcluding": "6.16.1",
              "versionStartIncluding": "6.16",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: fix double free in \u0027hci_discovery_filter_clear()\u0027\n\nFunction \u0027hci_discovery_filter_clear()\u0027 frees \u0027uuids\u0027 array and then\nsets it to NULL. There is a tiny chance of the following race:\n\n\u0027hci_cmd_sync_work()\u0027\n\n \u0027update_passive_scan_sync()\u0027\n\n   \u0027hci_update_passive_scan_sync()\u0027\n\n     \u0027hci_discovery_filter_clear()\u0027\n       kfree(uuids);\n\n       \u003c-------------------------preempted--------------------------------\u003e\n                                           \u0027start_service_discovery()\u0027\n\n                                             \u0027hci_discovery_filter_clear()\u0027\n                                               kfree(uuids); // DOUBLE FREE\n\n       \u003c-------------------------preempted--------------------------------\u003e\n\n      uuids = NULL;\n\nTo fix it let\u0027s add locking around \u0027kfree()\u0027 call and NULL pointer\nassignment. Otherwise the following backtrace fires:\n\n[ ] ------------[ cut here ]------------\n[ ] kernel BUG at mm/slub.c:547!\n[ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\n[ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1\n[ ] Tainted: [O]=OOT_MODULE\n[ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ ] pc : __slab_free+0xf8/0x348\n[ ] lr : __slab_free+0x48/0x348\n...\n[ ] Call trace:\n[ ]  __slab_free+0xf8/0x348\n[ ]  kfree+0x164/0x27c\n[ ]  start_service_discovery+0x1d0/0x2c0\n[ ]  hci_sock_sendmsg+0x518/0x924\n[ ]  __sock_sendmsg+0x54/0x60\n[ ]  sock_write_iter+0x98/0xf8\n[ ]  do_iter_readv_writev+0xe4/0x1c8\n[ ]  vfs_writev+0x128/0x2b0\n[ ]  do_writev+0xfc/0x118\n[ ]  __arm64_sys_writev+0x20/0x2c\n[ ]  invoke_syscall+0x68/0xf0\n[ ]  el0_svc_common.constprop.0+0x40/0xe0\n[ ]  do_el0_svc+0x1c/0x28\n[ ]  el0_svc+0x30/0xd0\n[ ]  el0t_64_sync_handler+0x100/0x12c\n[ ]  el0t_64_sync+0x194/0x198\n[ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000)\n[ ] ---[ end trace 0000000000000000 ]---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Bluetooth: hci_sync: corrige la doble liberaci\u00f3n en \u0027hci_discovery_filter_clear()\u0027 La funci\u00f3n \u0027hci_discovery_filter_clear()\u0027 libera la matriz \u0027uuids\u0027 y luego la establece en NULL. Hay una peque\u00f1a posibilidad de la siguiente ejecuci\u00f3n: \u0027hci_cmd_sync_work()\u0027 \u0027update_passive_scan_sync()\u0027 \u0027hci_update_passive_scan_sync()\u0027 \u0027hci_discovery_filter_clear()\u0027 kfree(uuids); \u0026lt;-------------------------preempted--------------------------------\u0026gt; \u0027start_service_discovery()\u0027 \u0027hci_discovery_filter_clear()\u0027 kfree(uuids); // DOBLE LIBERACI\u00d3N \u0026lt;-------------------------preempted--------------------------------\u0026gt; uuids = NULL; Para solucionarlo, agreguemos un bloqueo alrededor de la llamada \u0027kfree()\u0027 y la asignaci\u00f3n del puntero NULL. De lo contrario, se activa el siguiente backtrace: [ ] ------------[ cortar aqu\u00ed ]------------ [ ] \u00a1ERROR del kernel en mm/slub.c:547! [ ] Error interno: Ups - ERROR: 00000000f2000800 [#1] PREEMPT SMP [ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1 [ ] Tainted: [O]=OOT_MODULE [ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ ] pc : __slab_free+0xf8/0x348 [ ] lr : __slab_free+0x48/0x348 ... [ ] Call trace: [ ] __slab_free+0xf8/0x348 [ ] kfree+0x164/0x27c [ ] start_service_discovery+0x1d0/0x2c0 [ ] hci_sock_sendmsg+0x518/0x924 [ ] __sock_sendmsg+0x54/0x60 [ ] sock_write_iter+0x98/0xf8 [ ] do_iter_readv_writev+0xe4/0x1c8 [ ] vfs_writev+0x128/0x2b0 [ ] do_writev+0xfc/0x118 [ ] __arm64_sys_writev+0x20/0x2c [ ] invoke_syscall+0x68/0xf0 [ ] el0_svc_common.constprop.0+0x40/0xe0 [ ] do_el0_svc+0x1c/0x28 [ ] el0_svc+0x30/0xd0 [ ] el0t_64_sync_handler+0x100/0x12c [ ] el0t_64_sync+0x194/0x198 [ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000) [ ] ---[ end trace 0000000000000000 ]-]---"
    }
  ],
  "id": "CVE-2025-38593",
  "lastModified": "2026-10-15T22:18:46.633",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-38593",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-15T21:52:06.790277Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-08-19T17:15:37.067",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/16852eccbdfaf41a666705e3f8be55cf2864c5ca"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/2935e556850e9c94d7a00adf14d3cd7fe406ac03"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/7ce9bb0b95fc280e9212b8922590c492ca1d9c39"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/86f3dcd1f331cfd4fd7ec88906955134ec51afbe"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/a351ff6b8ecca4229afaa0d98042bead8de64799"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/f8069f34c4c976786ded97498012225af87435d7"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-415"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-38593 (GCVE-0-2025-38593)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:03 – Updated: 2026-10-15 22:02

Title

Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/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 21:52 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7067 records in the last 180 days details

References

6 references

URL	Tags
https://git.kernel.org/stable/c/86f3dcd1f331cfd4f…
https://git.kernel.org/stable/c/7ce9bb0b95fc280e9…
https://git.kernel.org/stable/c/16852eccbdfaf41a6…
https://git.kernel.org/stable/c/a351ff6b8ecca4229…
https://git.kernel.org/stable/c/f8069f34c4c976786…
https://git.kernel.org/stable/c/2935e556850e9c94d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ad383c2c65a5baf16e334cd40a013cc302176891 , < 86f3dcd1f331cfd4fd7ec88906955134ec51afbe (git) Affected: ad383c2c65a5baf16e334cd40a013cc302176891 , < 7ce9bb0b95fc280e9212b8922590c492ca1d9c39 (git) Affected: ad383c2c65a5baf16e334cd40a013cc302176891 , < 16852eccbdfaf41a666705e3f8be55cf2864c5ca (git) Affected: ad383c2c65a5baf16e334cd40a013cc302176891 , < a351ff6b8ecca4229afaa0d98042bead8de64799 (git) Affected: ad383c2c65a5baf16e334cd40a013cc302176891 , < f8069f34c4c976786ded97498012225af87435d7 (git) Affected: ad383c2c65a5baf16e334cd40a013cc302176891 , < 2935e556850e9c94d7a00adf14d3cd7fe406ac03 (git)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 6.1.159 , ≤ 6.1.* (semver) Unaffected: 6.6.117 , ≤ 6.6.* (semver) Unaffected: 6.12.42 , ≤ 6.12.* (semver) Unaffected: 6.15.10 , ≤ 6.15.* (semver) Unaffected: 6.16.1 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-38593",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:52:06.790277Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-15T22:02:26.347Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "86f3dcd1f331cfd4fd7ec88906955134ec51afbe",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            },
            {
              "lessThan": "7ce9bb0b95fc280e9212b8922590c492ca1d9c39",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            },
            {
              "lessThan": "16852eccbdfaf41a666705e3f8be55cf2864c5ca",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            },
            {
              "lessThan": "a351ff6b8ecca4229afaa0d98042bead8de64799",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            },
            {
              "lessThan": "f8069f34c4c976786ded97498012225af87435d7",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            },
            {
              "lessThan": "2935e556850e9c94d7a00adf14d3cd7fe406ac03",
              "status": "affected",
              "version": "ad383c2c65a5baf16e334cd40a013cc302176891",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.159",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.159",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.117",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.42",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.10",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.1",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: fix double free in \u0027hci_discovery_filter_clear()\u0027\n\nFunction \u0027hci_discovery_filter_clear()\u0027 frees \u0027uuids\u0027 array and then\nsets it to NULL. There is a tiny chance of the following race:\n\n\u0027hci_cmd_sync_work()\u0027\n\n \u0027update_passive_scan_sync()\u0027\n\n   \u0027hci_update_passive_scan_sync()\u0027\n\n     \u0027hci_discovery_filter_clear()\u0027\n       kfree(uuids);\n\n       \u003c-------------------------preempted--------------------------------\u003e\n                                           \u0027start_service_discovery()\u0027\n\n                                             \u0027hci_discovery_filter_clear()\u0027\n                                               kfree(uuids); // DOUBLE FREE\n\n       \u003c-------------------------preempted--------------------------------\u003e\n\n      uuids = NULL;\n\nTo fix it let\u0027s add locking around \u0027kfree()\u0027 call and NULL pointer\nassignment. Otherwise the following backtrace fires:\n\n[ ] ------------[ cut here ]------------\n[ ] kernel BUG at mm/slub.c:547!\n[ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\n[ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1\n[ ] Tainted: [O]=OOT_MODULE\n[ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ ] pc : __slab_free+0xf8/0x348\n[ ] lr : __slab_free+0x48/0x348\n...\n[ ] Call trace:\n[ ]  __slab_free+0xf8/0x348\n[ ]  kfree+0x164/0x27c\n[ ]  start_service_discovery+0x1d0/0x2c0\n[ ]  hci_sock_sendmsg+0x518/0x924\n[ ]  __sock_sendmsg+0x54/0x60\n[ ]  sock_write_iter+0x98/0xf8\n[ ]  do_iter_readv_writev+0xe4/0x1c8\n[ ]  vfs_writev+0x128/0x2b0\n[ ]  do_writev+0xfc/0x118\n[ ]  __arm64_sys_writev+0x20/0x2c\n[ ]  invoke_syscall+0x68/0xf0\n[ ]  el0_svc_common.constprop.0+0x40/0xe0\n[ ]  do_el0_svc+0x1c/0x28\n[ ]  el0_svc+0x30/0xd0\n[ ]  el0t_64_sync_handler+0x100/0x12c\n[ ]  el0t_64_sync+0x194/0x198\n[ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000)\n[ ] ---[ end trace 0000000000000000 ]---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires issuing MGMT_OP_START_SERVICE_DISCOVERY/START_DISCOVERY on a local AF_BLUETOOTH HCI control socket via sendmsg/writev, so the attacker must have local system access. A remote/adjacent Bluetooth peer can only pump the workqueue side of the race (via LE connect/disconnect events), not the mgmt side, so local access is mandatory.\nAC:L - The attacker drives both sides of the race from the same socket \u2014 one thread loops START_SERVICE_DISCOVERY/STOP_DISCOVERY while another loops SET_SCAN_PARAMS/SET_DEVICE_FLAGS/adv-monitor ops to queue update_passive_scan_sync() \u2014 and the free paths take disjoint locks (hci_dev_lock vs hci_req_sync_lock), so the window is reachable and retryable indefinitely on a PREEMPT SMP kernel. The crash was in fact observed spontaneously in production with ordinary bluetoothd traffic.\nPR:L - The mgmt channel requires CAP_NET_ADMIN, but in the realistic Bluetooth deployments (Android\u0027s non-root AID_BLUETOOTH service, ChromeOS/embedded/automotive BT daemons) that capability is held by an unprivileged, SELinux-confined, remotely-reachable service process rather than by root, so a compromised Bluetooth daemon \u2014 far short of full admin \u2014 suffices to reach the bug.\nUI:N - No victim action is needed; the attacker\u0027s own threads issue every mgmt command required to open and hit the race window. No pairing, mount, or user-initiated scan is involved.\nS:U - The double free corrupts kernel heap metadata within the same kernel security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The double free of an attacker-sized (up to ~64 KB) and attacker-filled buffer corrupts the SLUB freelist and leaves a dangling hdev-\u003ediscovery.uuids that is still dereferenced by is_filter_match()/eir_has_uuids() on the advertisement RX path, yielding a use-after-free read that can be groomed into arbitrary kernel memory disclosure.\nI:H - A double free hands the same slab object to two owners, a classic primitive for cross-cache/overlapping-allocation attacks that convert into arbitrary kernel writes and control-flow hijack; the attacker fully controls the object\u0027s size class and contents, making the grooming practical.\nA:H - The reported, directly observed consequence is a kernel BUG() in __slab_free (mm/slub.c:547) taking down the machine, and freelist corruption reliably panics the kernel even when not weaponized further."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:03:15.011Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/86f3dcd1f331cfd4fd7ec88906955134ec51afbe"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ce9bb0b95fc280e9212b8922590c492ca1d9c39"
        },
        {
          "url": "https://git.kernel.org/stable/c/16852eccbdfaf41a666705e3f8be55cf2864c5ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/a351ff6b8ecca4229afaa0d98042bead8de64799"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8069f34c4c976786ded97498012225af87435d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/2935e556850e9c94d7a00adf14d3cd7fe406ac03"
        }
      ],
      "title": "Bluetooth: hci_sync: fix double free in \u0027hci_discovery_filter_clear()\u0027",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38593",
    "datePublished": "2025-08-19T17:03:18.960Z",
    "dateReserved": "2025-04-16T04:51:24.028Z",
    "dateUpdated": "2026-10-15T22:02:26.347Z",
    "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.
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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.

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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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