Vulnerability-Lookup

FKIE_CVE-2021-47346

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-08-04 10:16

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer() commit 6f755e85c332 ("coresight: Add helper for inserting synchronization packets") removed trailing '\0' from barrier_pkt array and updated the call sites like etb_update_buffer() to have proper checks for barrier_pkt size before read but missed updating tmc_update_etf_buffer() which still reads barrier_pkt past the array size resulting in KASAN out-of-bounds bug. Fix this by adding a check for barrier_pkt size before accessing like it is done in etb_update_buffer(). BUG: KASAN: global-out-of-bounds in tmc_update_etf_buffer+0x4b8/0x698 Read of size 4 at addr ffffffd05b7d1030 by task perf/2629 Call trace: dump_backtrace+0x0/0x27c show_stack+0x20/0x2c dump_stack+0x11c/0x188 print_address_description+0x3c/0x4a4 __kasan_report+0x140/0x164 kasan_report+0x10/0x18 __asan_report_load4_noabort+0x1c/0x24 tmc_update_etf_buffer+0x4b8/0x698 etm_event_stop+0x248/0x2d8 etm_event_del+0x20/0x2c event_sched_out+0x214/0x6f0 group_sched_out+0xd0/0x270 ctx_sched_out+0x2ec/0x518 __perf_event_task_sched_out+0x4fc/0xe6c __schedule+0x1094/0x16a0 preempt_schedule_irq+0x88/0x170 arm64_preempt_schedule_irq+0xf0/0x18c el1_irq+0xe8/0x180 perf_event_exec+0x4d8/0x56c setup_new_exec+0x204/0x400 load_elf_binary+0x72c/0x18c0 search_binary_handler+0x13c/0x420 load_script+0x500/0x6c4 search_binary_handler+0x13c/0x420 exec_binprm+0x118/0x654 __do_execve_file+0x77c/0xba4 __arm64_compat_sys_execve+0x98/0xac el0_svc_common+0x1f8/0x5e0 el0_svc_compat_handler+0x84/0xb0 el0_svc_compat+0x10/0x50 The buggy address belongs to the variable: barrier_pkt+0x10/0x40 Memory state around the buggy address: ffffffd05b7d0f00: fa fa fa fa 04 fa fa fa fa fa fa fa 00 00 00 00 ffffffd05b7d0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffffd05b7d1000: 00 00 00 00 00 00 fa fa fa fa fa fa 00 00 00 03 ^ ffffffd05b7d1080: fa fa fa fa 00 02 fa fa fa fa fa fa 03 fa fa fa ffffffd05b7d1100: fa fa fa fa 00 00 00 00 05 fa fa fa fa fa fa fa ==================================================================

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0115687be7b13993066aef602253a53d55f5b11f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/04bd77ef4f4d9fc6102023b85f4590fc2130aac5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/35c1c4bd2d59ad734129d4e232af9d1098023918	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5fae8a946ac2df879caf3f79a193d4766d00239b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/733d4d95c0101d5f277b8e4910411d016e49a9dc	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ef0a06acc6b16388640ad367eedfa2a17f1945db	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/0115687be7b13993066aef602253a53d55f5b11f	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/04bd77ef4f4d9fc6102023b85f4590fc2130aac5	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/35c1c4bd2d59ad734129d4e232af9d1098023918	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/5fae8a946ac2df879caf3f79a193d4766d00239b	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/733d4d95c0101d5f277b8e4910411d016e49a9dc	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/ef0a06acc6b16388640ad367eedfa2a17f1945db	Patch

Impacted products

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

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwtracing/coresight/coresight-tmc-etf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "04bd77ef4f4d9fc6102023b85f4590fc2130aac5",
              "status": "affected",
              "version": "0c3fc4d5fa26092853278145aca9b21fa52a3e93",
              "versionType": "git"
            },
            {
              "lessThan": "ef0a06acc6b16388640ad367eedfa2a17f1945db",
              "status": "affected",
              "version": "0c3fc4d5fa26092853278145aca9b21fa52a3e93",
              "versionType": "git"
            },
            {
              "lessThan": "35c1c4bd2d59ad734129d4e232af9d1098023918",
              "status": "affected",
              "version": "0c3fc4d5fa26092853278145aca9b21fa52a3e93",
              "versionType": "git"
            },
            {
              "lessThan": "733d4d95c0101d5f277b8e4910411d016e49a9dc",
              "status": "affected",
              "version": "0c3fc4d5fa26092853278145aca9b21fa52a3e93",
              "versionType": "git"
            },
            {
              "lessThan": "0115687be7b13993066aef602253a53d55f5b11f",
              "status": "affected",
              "version": "0c3fc4d5fa26092853278145aca9b21fa52a3e93",
              "versionType": "git"
            },
            {
              "lessThan": "5fae8a946ac2df879caf3f79a193d4766d00239b",
              "status": "affected",
              "version": "0c3fc4d5fa26092853278145aca9b21fa52a3e93",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwtracing/coresight/coresight-tmc-etf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.14"
            },
            {
              "lessThan": "4.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.198",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.133",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.13.*",
              "status": "unaffected",
              "version": "5.13.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "FF4CC424-32DE-434F-BAFA-9BC2F78E35C1",
              "versionEndExcluding": "4.19.198",
              "versionStartIncluding": "4.14",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "65A8F1FF-5639-455A-8BF4-9FF529240505",
              "versionEndExcluding": "5.4.133",
              "versionStartIncluding": "4.20",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "93289127-DFB3-4515-89DD-50521FF8B7FF",
              "versionEndExcluding": "5.10.51",
              "versionStartIncluding": "5.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "79D13C82-E06F-4A70-A3D1-C09494FBC94D",
              "versionEndExcluding": "5.12.18",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "853187F6-707A-487B-95C0-621B5211B43C",
              "versionEndExcluding": "5.13.3",
              "versionStartIncluding": "5.13",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()\n\ncommit 6f755e85c332 (\"coresight: Add helper for inserting synchronization\npackets\") removed trailing \u0027\\0\u0027 from barrier_pkt array and updated the\ncall sites like etb_update_buffer() to have proper checks for barrier_pkt\nsize before read but missed updating tmc_update_etf_buffer() which still\nreads barrier_pkt past the array size resulting in KASAN out-of-bounds\nbug. Fix this by adding a check for barrier_pkt size before accessing\nlike it is done in etb_update_buffer().\n\n BUG: KASAN: global-out-of-bounds in tmc_update_etf_buffer+0x4b8/0x698\n Read of size 4 at addr ffffffd05b7d1030 by task perf/2629\n\n Call trace:\n  dump_backtrace+0x0/0x27c\n  show_stack+0x20/0x2c\n  dump_stack+0x11c/0x188\n  print_address_description+0x3c/0x4a4\n  __kasan_report+0x140/0x164\n  kasan_report+0x10/0x18\n  __asan_report_load4_noabort+0x1c/0x24\n  tmc_update_etf_buffer+0x4b8/0x698\n  etm_event_stop+0x248/0x2d8\n  etm_event_del+0x20/0x2c\n  event_sched_out+0x214/0x6f0\n  group_sched_out+0xd0/0x270\n  ctx_sched_out+0x2ec/0x518\n  __perf_event_task_sched_out+0x4fc/0xe6c\n  __schedule+0x1094/0x16a0\n  preempt_schedule_irq+0x88/0x170\n  arm64_preempt_schedule_irq+0xf0/0x18c\n  el1_irq+0xe8/0x180\n  perf_event_exec+0x4d8/0x56c\n  setup_new_exec+0x204/0x400\n  load_elf_binary+0x72c/0x18c0\n  search_binary_handler+0x13c/0x420\n  load_script+0x500/0x6c4\n  search_binary_handler+0x13c/0x420\n  exec_binprm+0x118/0x654\n  __do_execve_file+0x77c/0xba4\n  __arm64_compat_sys_execve+0x98/0xac\n  el0_svc_common+0x1f8/0x5e0\n  el0_svc_compat_handler+0x84/0xb0\n  el0_svc_compat+0x10/0x50\n\n The buggy address belongs to the variable:\n  barrier_pkt+0x10/0x40\n\n Memory state around the buggy address:\n  ffffffd05b7d0f00: fa fa fa fa 04 fa fa fa fa fa fa fa 00 00 00 00\n  ffffffd05b7d0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n \u003effffffd05b7d1000: 00 00 00 00 00 00 fa fa fa fa fa fa 00 00 00 03\n                                      ^\n  ffffffd05b7d1080: fa fa fa fa 00 02 fa fa fa fa fa fa 03 fa fa fa\n  ffffffd05b7d1100: fa fa fa fa 00 00 00 00 05 fa fa fa fa fa fa fa\n =================================================================="
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: coresight: tmc-etf: Correcci\u00f3n global fuera de los l\u00edmites en tmc_update_etf_buffer() confirmaci\u00f3n 6f755e85c332 (\"coresight: Agregar ayuda para insertar paquetes de sincronizaci\u00f3n\") eliminado el final \u0027\\0\u0027 desde la matriz barrier_pkt y actualic\u00e9 los sitios de llamadas como etb_update_buffer() para realizar comprobaciones adecuadas del tama\u00f1o de la barrera_pkt antes de leer, pero no se actualiz\u00f3 tmc_update_etf_buffer(), que todav\u00eda lee barrier_pkt m\u00e1s all\u00e1 del tama\u00f1o de la matriz, lo que genera un error de KASAN fuera de los l\u00edmites. Solucione este problema agregando una verificaci\u00f3n del tama\u00f1o de barrier_pkt antes de acceder, como se hace en etb_update_buffer(). bug: KASAN: global fuera de los l\u00edmites en tmc_update_etf_buffer+0x4b8/0x698 Lectura de tama\u00f1o 4 en la direcci\u00f3n ffffffd05b7d1030 por tarea perf/2629 Rastreo de llamadas: dump_backtrace+0x0/0x27c show_stack+0x20/0x2c dump_stack+0x11c/0x188 descripci\u00f3n+0x3c /0x4a4 __kasan_report+0x140/0x164 kasan_report+0x10/0x18 __asan_report_load4_noabort+0x1c/0x24 tmc_update_etf_buffer+0x4b8/0x698 etm_event_stop+0x248/0x2d8 etm_event_del+0x20/0x2c event_sched_out+0x214/0x6f0 group_sched_out+0xd0/0x270 ctx_sched_out+0x2ec/0x518 __perf_event_task_sched_out+0x4fc /0xe6c __schedule+0x1094/0x16a0 preempt_schedule_irq+0x88/0x170 arm64_preempt_schedule_irq+0xf0/0x18c el1_irq+0xe8/0x180 perf_event_exec+0x4d8/0x56c setup_new_exec+0x204/0x4 00 load_elf_binary+0x72c/0x18c0 search_binary_handler+0x13c/0x420 load_script+0x500/0x6c4 search_binary_handler+0x13c /0x420 exec_binprm+0x118/0x654 __do_execve_file+0x77c/0xba4 __arm64_compat_sys_execve+0x98/0xac el0_svc_common+0x1f8/0x5e0 el0_svc_compat_handler+0x84/0xb0 x10/0x50 La direcci\u00f3n del buggy pertenece a la variable: barrier_pkt+0x10/0x40 Estado de la memoria alrededor del buggy direcci\u00f3n: ffffffd05b7d0f00: fa fa fa fa 04 fa fa fa fa fa fa fa 00 00 00 00 ffffffd05b7d0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 \u0026gt;ffffffd05b7d1000: 0 00 00 00 00 00 fa fa fa fa fa fa 00 00 00 03 ^ ffffffd05b7d1080: fa fa fa fa 00 02 fa fa fa fa fa fa 03 fa fa fa ffffffd05b7d1100: fa fa fa fa 00 00 00 00 05 fa fa fa fa fa fa fa ====== ==================================================== =========="
    }
  ],
  "id": "CVE-2021-47346",
  "lastModified": "2026-08-04T10:16:58.873",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47346",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-06-12T14:59:57.859823Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-21T15:15:21.217",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/0115687be7b13993066aef602253a53d55f5b11f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/04bd77ef4f4d9fc6102023b85f4590fc2130aac5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/35c1c4bd2d59ad734129d4e232af9d1098023918"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5fae8a946ac2df879caf3f79a193d4766d00239b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/733d4d95c0101d5f277b8e4910411d016e49a9dc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/ef0a06acc6b16388640ad367eedfa2a17f1945db"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/0115687be7b13993066aef602253a53d55f5b11f"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/04bd77ef4f4d9fc6102023b85f4590fc2130aac5"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/35c1c4bd2d59ad734129d4e232af9d1098023918"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5fae8a946ac2df879caf3f79a193d4766d00239b"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/733d4d95c0101d5f277b8e4910411d016e49a9dc"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/ef0a06acc6b16388640ad367eedfa2a17f1945db"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-47346 (GCVE-0-2021-47346)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-08-05 08:47

Title

coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()

Summary

Severity

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-06-12 14:59 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6637 records in the last 180 days details

References

6 references

URL	Tags
https://git.kernel.org/stable/c/04bd77ef4f4d9fc61…
https://git.kernel.org/stable/c/ef0a06acc6b163886…
https://git.kernel.org/stable/c/35c1c4bd2d59ad734…
https://git.kernel.org/stable/c/733d4d95c0101d5f2…
https://git.kernel.org/stable/c/0115687be7b139930…
https://git.kernel.org/stable/c/5fae8a946ac2df879…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0c3fc4d5fa26092853278145aca9b21fa52a3e93 , < 04bd77ef4f4d9fc6102023b85f4590fc2130aac5 (git) Affected: 0c3fc4d5fa26092853278145aca9b21fa52a3e93 , < ef0a06acc6b16388640ad367eedfa2a17f1945db (git) Affected: 0c3fc4d5fa26092853278145aca9b21fa52a3e93 , < 35c1c4bd2d59ad734129d4e232af9d1098023918 (git) Affected: 0c3fc4d5fa26092853278145aca9b21fa52a3e93 , < 733d4d95c0101d5f277b8e4910411d016e49a9dc (git) Affected: 0c3fc4d5fa26092853278145aca9b21fa52a3e93 , < 0115687be7b13993066aef602253a53d55f5b11f (git) Affected: 0c3fc4d5fa26092853278145aca9b21fa52a3e93 , < 5fae8a946ac2df879caf3f79a193d4766d00239b (git)
Linux	Linux	Affected: 4.14 Unaffected: 0 , < 4.14 (semver) Unaffected: 4.19.198 , ≤ 4.19.* (semver) Unaffected: 5.4.133 , ≤ 5.4.* (semver) Unaffected: 5.10.51 , ≤ 5.10.* (semver) Unaffected: 5.12.18 , ≤ 5.12.* (semver) Unaffected: 5.13.3 , ≤ 5.13.* (semver) Unaffected: 5.14 , ≤ * (original_commit_for_fix)

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                "id": "CVE-2021-47346",
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              "value": "AV:L - The bug is reached only through the CoreSight ETM perf PMU path (perf_event_open \u2192 etm_event_stop \u2192 tmc_update_etf_buffer), which requires local syscall access on a system with CoreSight ETF hardware.\nAC:L - An attacker who can open a cs_etm session can reliably force lost=true by using a small AUX buffer so to_read exceeds handle-\u003esize, which engages the broken barrier_pkt walk without depending on races or uncontrolled state.\nPR:L - Under the default perf_event_paranoid=2, an unprivileged user can open a per-task cs_etm event with exclude_kernel set; etm_event_init imposes no CAP_PERFMON/CAP_SYS_ADMIN check, so real root is not required.\nUI:N - The attacker configures and drives the perf session themselves; no separate victim action is required to reach tmc_update_etf_buffer.\nS:U - Impact stays within the host kernel authority (kernel memory disclosure / potential oops); there is no VM, IOMMU, or sandbox boundary crossing.\nC:H - When lost is set, the vulnerable loop keeps reading past coresight_barrier_pkt and writes those OOB kernel words into the attacker-readable perf AUX buffer, yielding an unbounded-until-zero out-of-bounds kernel read to userspace.\nI:N - The only stores are into the attacker\u2019s own AUX data_pages; there is no out-of-bounds or attacker-controlled write to other kernel memory or integrity-sensitive state.\nA:H - The global out-of-bounds read is a memory-safety violation that can fault if the walk proceeds into unmapped memory, and per scoring policy the higher availability impact is selected when a crash cannot be ruled out."
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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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