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

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-08-05 08:47
VLAI
Title
coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()
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 ==================================================================
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
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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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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        {
          "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": "2024-11-21T06:35:56.020",
      "published": "2024-05-21T15:15:21.217",
      "references": [
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/0115687be7b13993066aef602253a53d55f5b11f"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/04bd77ef4f4d9fc6102023b85f4590fc2130aac5"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/35c1c4bd2d59ad734129d4e232af9d1098023918"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/5fae8a946ac2df879caf3f79a193d4766d00239b"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/733d4d95c0101d5f277b8e4910411d016e49a9dc"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/ef0a06acc6b16388640ad367eedfa2a17f1945db"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/0115687be7b13993066aef602253a53d55f5b11f"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/04bd77ef4f4d9fc6102023b85f4590fc2130aac5"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/35c1c4bd2d59ad734129d4e232af9d1098023918"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/5fae8a946ac2df879caf3f79a193d4766d00239b"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/733d4d95c0101d5f277b8e4910411d016e49a9dc"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/ef0a06acc6b16388640ad367eedfa2a17f1945db"
        }
      ],
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": {
      "cve": {
        "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": [
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            "url": "https://git.kernel.org/stable/c/0115687be7b13993066aef602253a53d55f5b11f"
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            "url": "https://git.kernel.org/stable/c/0115687be7b13993066aef602253a53d55f5b11f"
          },
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            "source": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://git.kernel.org/stable/c/04bd77ef4f4d9fc6102023b85f4590fc2130aac5"
          },
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            "tags": [
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            ],
            "url": "https://git.kernel.org/stable/c/35c1c4bd2d59ad734129d4e232af9d1098023918"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
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            "url": "https://git.kernel.org/stable/c/5fae8a946ac2df879caf3f79a193d4766d00239b"
          },
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            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
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            ],
            "url": "https://git.kernel.org/stable/c/733d4d95c0101d5f277b8e4910411d016e49a9dc"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ef0a06acc6b16388640ad367eedfa2a17f1945db"
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "product_status:known_not_affected": "198",
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      "status": "final",
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47346.json",
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      "id": "CVE-2021-47346",
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      "product_status:known_not_affected": "385",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47346",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47346.json",
      "version": "20"
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                    "id": "CVE-2021-47346",
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              "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 =================================================================="
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                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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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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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.