CVE-2026-46272 (GCVE-0-2026-46272)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:50 – Updated: 2026-10-21 12:41
VLAI
Title
coresight: tmc-etr: Fix race condition between sysfs and perf mode
Summary
In the Linux kernel, the following vulnerability has been resolved: coresight: tmc-etr: Fix race condition between sysfs and perf mode When trying to run perf and sysfs mode simultaneously, the WARN_ON() in tmc_etr_enable_hw() is triggered sometimes: WARNING: CPU: 42 PID: 3911571 at drivers/hwtracing/coresight/coresight-tmc-etr.c:1060 tmc_etr_enable_hw+0xc0/0xd8 [coresight_tmc] [..snip..] Call trace: tmc_etr_enable_hw+0xc0/0xd8 [coresight_tmc] (P) tmc_enable_etr_sink+0x11c/0x250 [coresight_tmc] (L) tmc_enable_etr_sink+0x11c/0x250 [coresight_tmc] coresight_enable_path+0x1c8/0x218 [coresight] coresight_enable_sysfs+0xa4/0x228 [coresight] enable_source_store+0x58/0xa8 [coresight] dev_attr_store+0x20/0x40 sysfs_kf_write+0x4c/0x68 kernfs_fop_write_iter+0x120/0x1b8 vfs_write+0x2c8/0x388 ksys_write+0x74/0x108 __arm64_sys_write+0x24/0x38 el0_svc_common.constprop.0+0x64/0x148 do_el0_svc+0x24/0x38 el0_svc+0x3c/0x130 el0t_64_sync_handler+0xc8/0xd0 el0t_64_sync+0x1ac/0x1b0 ---[ end trace 0000000000000000 ]--- Since the enablement of sysfs mode is separeted into two critical regions, one for sysfs buffer allocation and another for hardware enablement, it's possible to race with the perf mode. Fix this by double check whether the perf mode's been used before enabling the hardware in sysfs mode. mode: [sysfs mode] [perf mode] tmc_etr_get_sysfs_buffer() spin_lock(&drvdata->spinlock) [sysfs buffer allocation] spin_unlock(&drvdata->spinlock) spin_lock(&drvdata->spinlock) tmc_etr_enable_hw() drvdata->etr_buf = etr_perf->etr_buf spin_unlock(&drvdata->spinlock) spin_lock(&drvdata->spinlock) tmc_etr_enable_hw() WARN_ON(drvdata->etr_buf) // WARN sicne etr_buf initialized at the perf side spin_unlock(&drvdata->spinlock) With this fix, we retain the check for CS_MODE_PERF in get_etr_sysfs_buf. This ensures we verify whether the perf mode's already running before we actually allocate the buffer. Then we can save the time of allocating/freeing the sysfs buffer if race with the perf mode.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 296b01fd106e787d4463974a7f42d286a5df08cd , < 3e8cdf184646c28c5ea5fba754d24a3b29068739 (git)
Affected: 296b01fd106e787d4463974a7f42d286a5df08cd , < 206b6f672613d08b33e951a744d0a1c6ac5ad8ad (git)
Affected: 296b01fd106e787d4463974a7f42d286a5df08cd , < 38a07194bbcddb18d77dad40ba9978d994c0b74c (git)
Affected: 296b01fd106e787d4463974a7f42d286a5df08cd , < 6906aa70d4fc5900b954136e20e27c2be6d1acab (git)
Affected: 296b01fd106e787d4463974a7f42d286a5df08cd , < e6e43e82c79c97917cbe356c07e8a6f3f982ab53 (git)
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Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoresight: tmc-etr: Fix race condition between sysfs and perf mode\n\nWhen trying to run perf and sysfs mode simultaneously, the WARN_ON()\nin tmc_etr_enable_hw() is triggered sometimes:\n\n WARNING: CPU: 42 PID: 3911571 at drivers/hwtracing/coresight/coresight-tmc-etr.c:1060 tmc_etr_enable_hw+0xc0/0xd8 [coresight_tmc]\n [..snip..]\n Call trace:\n  tmc_etr_enable_hw+0xc0/0xd8 [coresight_tmc] (P)\n  tmc_enable_etr_sink+0x11c/0x250 [coresight_tmc] (L)\n  tmc_enable_etr_sink+0x11c/0x250 [coresight_tmc]\n  coresight_enable_path+0x1c8/0x218 [coresight]\n  coresight_enable_sysfs+0xa4/0x228 [coresight]\n  enable_source_store+0x58/0xa8 [coresight]\n  dev_attr_store+0x20/0x40\n  sysfs_kf_write+0x4c/0x68\n  kernfs_fop_write_iter+0x120/0x1b8\n  vfs_write+0x2c8/0x388\n  ksys_write+0x74/0x108\n  __arm64_sys_write+0x24/0x38\n  el0_svc_common.constprop.0+0x64/0x148\n  do_el0_svc+0x24/0x38\n  el0_svc+0x3c/0x130\n  el0t_64_sync_handler+0xc8/0xd0\n  el0t_64_sync+0x1ac/0x1b0\n ---[ end trace 0000000000000000 ]---\n\nSince the enablement of sysfs mode is separeted into two critical regions,\none for sysfs buffer allocation and another for hardware enablement, it\u0027s\npossible to race with the perf mode. Fix this by double check whether\nthe perf mode\u0027s been used before enabling the hardware in sysfs mode.\n\n mode:\n   [sysfs mode]                   [perf mode]\n   tmc_etr_get_sysfs_buffer()\n     spin_lock(\u0026drvdata-\u003espinlock)\n     [sysfs buffer allocation]\n     spin_unlock(\u0026drvdata-\u003espinlock)\n                                  spin_lock(\u0026drvdata-\u003espinlock)\n                                  tmc_etr_enable_hw()\n                                    drvdata-\u003eetr_buf = etr_perf-\u003eetr_buf\n                                  spin_unlock(\u0026drvdata-\u003espinlock)\n   spin_lock(\u0026drvdata-\u003espinlock)\n   tmc_etr_enable_hw()\n     WARN_ON(drvdata-\u003eetr_buf) // WARN sicne etr_buf initialized at\n                                  the perf side\n   spin_unlock(\u0026drvdata-\u003espinlock)\n\nWith this fix, we retain the check for CS_MODE_PERF in get_etr_sysfs_buf.\nThis ensures we verify whether the perf mode\u0027s already running before we\nactually allocate the buffer. Then we can save the time of\nallocating/freeing the sysfs buffer if race with the perf mode."
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    "dateReserved": "2026-05-13T15:03:33.109Z",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoresight: tmc-etr: Fix race condition between sysfs and perf mode\n\nWhen trying to run perf and sysfs mode simultaneously, the WARN_ON()\nin tmc_etr_enable_hw() is triggered sometimes:\n\n WARNING: CPU: 42 PID: 3911571 at drivers/hwtracing/coresight/coresight-tmc-etr.c:1060 tmc_etr_enable_hw+0xc0/0xd8 [coresight_tmc]\n [..snip..]\n Call trace:\n  tmc_etr_enable_hw+0xc0/0xd8 [coresight_tmc] (P)\n  tmc_enable_etr_sink+0x11c/0x250 [coresight_tmc] (L)\n  tmc_enable_etr_sink+0x11c/0x250 [coresight_tmc]\n  coresight_enable_path+0x1c8/0x218 [coresight]\n  coresight_enable_sysfs+0xa4/0x228 [coresight]\n  enable_source_store+0x58/0xa8 [coresight]\n  dev_attr_store+0x20/0x40\n  sysfs_kf_write+0x4c/0x68\n  kernfs_fop_write_iter+0x120/0x1b8\n  vfs_write+0x2c8/0x388\n  ksys_write+0x74/0x108\n  __arm64_sys_write+0x24/0x38\n  el0_svc_common.constprop.0+0x64/0x148\n  do_el0_svc+0x24/0x38\n  el0_svc+0x3c/0x130\n  el0t_64_sync_handler+0xc8/0xd0\n  el0t_64_sync+0x1ac/0x1b0\n ---[ end trace 0000000000000000 ]---\n\nSince the enablement of sysfs mode is separeted into two critical regions,\none for sysfs buffer allocation and another for hardware enablement, it\u0027s\npossible to race with the perf mode. Fix this by double check whether\nthe perf mode\u0027s been used before enabling the hardware in sysfs mode.\n\n mode:\n   [sysfs mode]                   [perf mode]\n   tmc_etr_get_sysfs_buffer()\n     spin_lock(\u0026drvdata-\u003espinlock)\n     [sysfs buffer allocation]\n     spin_unlock(\u0026drvdata-\u003espinlock)\n                                  spin_lock(\u0026drvdata-\u003espinlock)\n                                  tmc_etr_enable_hw()\n                                    drvdata-\u003eetr_buf = etr_perf-\u003eetr_buf\n                                  spin_unlock(\u0026drvdata-\u003espinlock)\n   spin_lock(\u0026drvdata-\u003espinlock)\n   tmc_etr_enable_hw()\n     WARN_ON(drvdata-\u003eetr_buf) // WARN sicne etr_buf initialized at\n                                  the perf side\n   spin_unlock(\u0026drvdata-\u003espinlock)\n\nWith this fix, we retain the check for CS_MODE_PERF in get_etr_sysfs_buf.\nThis ensures we verify whether the perf mode\u0027s already running before we\nactually allocate the buffer. Then we can save the time of\nallocating/freeing the sysfs buffer if race with the perf mode."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncoresight: tmc-etr: Soluciona condici\u00f3n de carrera entre el modo sysfs y perf\n\nAl intentar ejecutar los modos perf y sysfs simult\u00e1neamente, el WARN_ON() en tmc_etr_enable_hw() se activa a veces:\n\n ADVERTENCIA: CPU: 42 PID: 3911571 en drivers/hwtracing/coresight/coresight-tmc-etr.c:1060 tmc_etr_enable_hw+0xc0/0xd8 [coresight_tmc]\n [..recorte..]\n Rastro de llamada:\n  tmc_etr_enable_hw+0xc0/0xd8 [coresight_tmc] (P)\n  tmc_enable_etr_sink+0x11c/0x250 [coresight_tmc] (L)\n  tmc_enable_etr_sink+0x11c/0x250 [coresight_tmc]\n  coresight_enable_path+0x1c8/0x218 [coresight]\n  coresight_enable_sysfs+0xa4/0x228 [coresight]\n  enable_source_store+0x58/0xa8 [coresight]\n  dev_attr_store+0x20/0x40\n  sysfs_kf_write+0x4c/0x68\n  kernfs_fop_write_iter+0x120/0x1b8\n  vfs_write+0x2c8/0x388\n  ksys_write+0x74/0x108\n  __arm64_sys_write+0x24/0x38\n  el0_svc_common.constprop.0+0x64/0x148\n  do_el0_svc+0x24/0x38\n  el0_svc+0x3c/0x130\n  el0t_64_sync_handler+0xc8/0xd0\n  el0t_64_sync+0x1ac/0x1b0\n ---[ fin del rastro 0000000000000000 ]---\n\nDado que la habilitaci\u00f3n del modo sysfs est\u00e1 separada en dos regiones cr\u00edticas, una para la asignaci\u00f3n del b\u00fafer sysfs y otra para la habilitaci\u00f3n del hardware, es posible que haya una condici\u00f3n de carrera con el modo perf. Soluciona esto verificando dos veces si el modo perf ha sido utilizado antes de habilitar el hardware en el modo sysfs.\n\n modo:\n   [modo sysfs]                   [modo perf]\n   tmc_etr_get_sysfs_buffer()\n     spin_lock(\u0026drvdata-\u003espinlock)\n     [asignaci\u00f3n de b\u00fafer sysfs]\n     spin_unlock(\u0026drvdata-\u003espinlock)\n                                  spin_lock(\u0026drvdata-\u003espinlock)\n                                  tmc_etr_enable_hw()\n                                    drvdata-\u003eetr_buf = etr_perf-\u003eetr_buf\n                                  spin_unlock(\u0026drvdata-\u003espinlock)\n   spin_lock(\u0026drvdata-\u003espinlock)\n   tmc_etr_enable_hw()\n     WARN_ON(drvdata-\u003eetr_buf) // ADVERTENCIA ya que etr_buf inicializado en\n                                  el lado perf\n   spin_unlock(\u0026drvdata-\u003espinlock)\n\nCon esta soluci\u00f3n, mantenemos la verificaci\u00f3n de CS_MODE_PERF en get_etr_sysfs_buf. Esto asegura que verifiquemos si el modo perf ya est\u00e1 en ejecuci\u00f3n antes de asignar realmente el b\u00fafer. Entonces podemos ahorrar el tiempo de asignar/liberar el b\u00fafer sysfs si hay una condici\u00f3n de carrera con el modo perf."
          }
        ],
        "id": "CVE-2026-46272",
        "lastModified": "2026-10-21T13:19:06.063",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 4.7,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-06-03T18:16:29.023",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/206b6f672613d08b33e951a744d0a1c6ac5ad8ad"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/38a07194bbcddb18d77dad40ba9978d994c0b74c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3e8cdf184646c28c5ea5fba754d24a3b29068739"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/6906aa70d4fc5900b954136e20e27c2be6d1acab"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e6e43e82c79c97917cbe356c07e8a6f3f982ab53"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-362"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-11-07T10:59:10+00:00",
      "cve": "CVE-2026-46272",
      "id": "CVE-2026-46272",
      "initial_release_date": "2026-06-03T00:00:00+00:00",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: coresight: tmc-etr: Fix race condition between sysfs and perf mode",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46272.json",
      "version": "3"
    }
  }
}



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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

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

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.