CVE-2025-68376 (GCVE-0-2025-68376)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:33 – Updated: 2026-10-21 12:38
VLAI
Title
coresight: ETR: Fix ETR buffer use-after-free issue
Summary
In the Linux kernel, the following vulnerability has been resolved: coresight: ETR: Fix ETR buffer use-after-free issue When ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed and enabled again, currently sysfs_buf will point to the newly allocated memory(buf_new) and free the old memory(buf_old). But the etr_buf that is being used by the ETR remains pointed to buf_old, not updated to buf_new. In this case, it will result in a memory use-after-free issue. Fix this by checking ETR's mode before updating and releasing buf_old, if the mode is CS_MODE_SYSFS, then skip updating and releasing it.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bd2767ec3df2775bc336f441f9068a989ccb919d , < 5d5d130835b417c7bfd6c942f0149e34397d4463 (git)
Affected: bd2767ec3df2775bc336f441f9068a989ccb919d , < 4e83434247ff8005a0b9a1ee997864abf8f259ec (git)
Affected: bd2767ec3df2775bc336f441f9068a989ccb919d , < 70acbc9c77686b7a521af6d7a543dcd9c324cf07 (git)
Affected: bd2767ec3df2775bc336f441f9068a989ccb919d , < cda077a19f5c8d6ec61e5b97deca203d95e3a422 (git)
Affected: bd2767ec3df2775bc336f441f9068a989ccb919d , < 35501ac3c7d40a7bb9568c2f89d6b56beaf9bed3 (git)
Affected: fdd3ceb0001da6768bede9779a0190a42e65c404 (git)
Affected: 6.5.8 , < 6.6 (semver)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.17.13 , ≤ 6.17.* (semver)
Unaffected: 6.18.2 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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              "versionType": "semver"
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              "version": "6.18.2",
              "versionType": "semver"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoresight: ETR: Fix ETR buffer use-after-free issue\n\nWhen ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed\nand enabled again, currently sysfs_buf will point to the newly\nallocated memory(buf_new) and free the old memory(buf_old). But the\netr_buf that is being used by the ETR remains pointed to buf_old, not\nupdated to buf_new. In this case, it will result in a memory\nuse-after-free issue.\n\nFix this by checking ETR\u0027s mode before updating and releasing buf_old,\nif the mode is CS_MODE_SYSFS, then skip updating and releasing it."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:38:21.502Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/5d5d130835b417c7bfd6c942f0149e34397d4463"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e83434247ff8005a0b9a1ee997864abf8f259ec"
        },
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/35501ac3c7d40a7bb9568c2f89d6b56beaf9bed3"
        }
      ],
      "title": "coresight: ETR: Fix ETR buffer use-after-free issue",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68376",
    "datePublished": "2025-12-24T10:33:05.503Z",
    "dateReserved": "2025-12-16T14:48:05.310Z",
    "dateUpdated": "2026-10-21T12:38:21.502Z",
    "state": "PUBLISHED"
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      "id": "msrc_CVE-2025-68376",
      "initial_release_date": "2025-12-02T00:00:00.000Z",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "coresight: ETR: Fix ETR buffer use-after-free issue",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-68376.json",
      "version": "4"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoresight: ETR: Fix ETR buffer use-after-free issue\n\nWhen ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed\nand enabled again, currently sysfs_buf will point to the newly\nallocated memory(buf_new) and free the old memory(buf_old). But the\netr_buf that is being used by the ETR remains pointed to buf_old, not\nupdated to buf_new. In this case, it will result in a memory\nuse-after-free issue.\n\nFix this by checking ETR\u0027s mode before updating and releasing buf_old,\nif the mode is CS_MODE_SYSFS, then skip updating and releasing it."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncoresight: ETR: Solucionar el problema de uso despu\u00e9s de liberaci\u00f3n del b\u00fafer ETR\n\nCuando ETR est\u00e1 habilitado como CS_MODE_SYSFS, si el tama\u00f1o del b\u00fafer se cambia y se habilita de nuevo, actualmente sysfs_buf apuntar\u00e1 a la memoria reci\u00e9n asignada (buf_new) y liberar\u00e1 la memoria antigua (buf_old). Pero el etr_buf que est\u00e1 siendo utilizado por el ETR permanece apuntando a buf_old, no actualizado a buf_new. En este caso, resultar\u00e1 en un problema de uso despu\u00e9s de liberaci\u00f3n de memoria.\n\nSolucione esto verificando el modo de ETR antes de actualizar y liberar buf_old; si el modo es CS_MODE_SYSFS, entonces omita su actualizaci\u00f3n y liberaci\u00f3n."
          }
        ],
        "id": "CVE-2025-68376",
        "lastModified": "2026-10-21T13:18:23.520",
        "metrics": {},
        "published": "2025-12-24T11:16:01.193",
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      "cve": "CVE-2025-68376",
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      "version": "3"
    }
  }
}



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