CVE-2025-39792 (GCVE-0-2025-39792)

Vulnerability from cvelistv5 – Published: 2025-09-12 15:59 – Updated: 2026-10-15 22:02
VLAI
Title
dm: Always split write BIOs to zoned device limits
Summary
In the Linux kernel, the following vulnerability has been resolved: dm: Always split write BIOs to zoned device limits Any zoned DM target that requires zone append emulation will use the block layer zone write plugging. In such case, DM target drivers must not split BIOs using dm_accept_partial_bio() as doing so can potentially lead to deadlocks with queue freeze operations. Regular write operations used to emulate zone append operations also cannot be split by the target driver as that would result in an invalid writen sector value return using the BIO sector. In order for zoned DM target drivers to avoid such incorrect BIO splitting, we must ensure that large BIOs are split before being passed to the map() function of the target, thus guaranteeing that the limits for the mapped device are not exceeded. dm-crypt and dm-flakey are the only target drivers supporting zoned devices and using dm_accept_partial_bio(). In the case of dm-crypt, this function is used to split BIOs to the internal max_write_size limit (which will be suppressed in a different patch). However, since crypt_alloc_buffer() uses a bioset allowing only up to BIO_MAX_VECS (256) vectors in a BIO. The dm-crypt device max_segments limit, which is not set and so default to BLK_MAX_SEGMENTS (128), must thus be respected and write BIOs split accordingly. In the case of dm-flakey, since zone append emulation is not required, the block layer zone write plugging is not used and no splitting of BIOs required. Modify the function dm_zone_bio_needs_split() to use the block layer helper function bio_needs_zone_write_plugging() to force a call to bio_split_to_limits() in dm_split_and_process_bio(). This allows DM target drivers to avoid using dm_accept_partial_bio() for write operations on zoned DM devices.
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 21:54 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7034 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f211268ed1f9bdf48f06a3ead5f5d88437450579 , < d10bf66d9f9335ffc7521b3029b114f50604cabe (git)
Affected: f211268ed1f9bdf48f06a3ead5f5d88437450579 , < f5dd256333c08ab44b5aec4a8118cb04c0f20c54 (git)
Affected: f211268ed1f9bdf48f06a3ead5f5d88437450579 , < 4e9fef1cf0243d665d75c371cc80be6156cd30a2 (git)
Affected: f211268ed1f9bdf48f06a3ead5f5d88437450579 , < 2df7168717b7d2d32bcf017c68be16e4aae9dd13 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndm: Siempre dividir los BIO de escritura a los l\u00edmites del dispositivo por zonas\n\nCualquier objetivo DM por zonas que requiera emulaci\u00f3n de adici\u00f3n de zona utilizar\u00e1 el \u0027plugging\u0027 de escritura de zona de la capa de bloques. En tal caso, los controladores de destino DM no deben dividir los BIO utilizando dm_accept_partial_bio() ya que hacerlo puede potencialmente conducir a interbloqueos con operaciones de congelaci\u00f3n de cola. Las operaciones de escritura regulares utilizadas para emular operaciones de adici\u00f3n de zona tampoco pueden ser divididas por el controlador de destino, ya que eso resultar\u00eda en un valor de sector escrito inv\u00e1lido devuelto utilizando el sector del BIO.\n\nPara que los controladores de destino DM por zonas eviten dicha divisi\u00f3n incorrecta de BIO, debemos asegurarnos de que los BIO grandes se dividan antes de ser pasados a la funci\u00f3n map() del destino, garantizando as\u00ed que no se excedan los l\u00edmites para el dispositivo mapeado.\n\ndm-crypt y dm-flakey son los \u00fanicos controladores de destino que soportan dispositivos por zonas y utilizan dm_accept_partial_bio().\n\nEn el caso de dm-crypt, esta funci\u00f3n se utiliza para dividir los BIO al l\u00edmite interno de max_write_size (que ser\u00e1 suprimido en un parche diferente). Sin embargo, dado que crypt_alloc_buffer() utiliza un bioset que permite solo hasta BIO_MAX_VECS (256) vectores en un BIO. El l\u00edmite max_segments del dispositivo dm-crypt, que no est\u00e1 establecido y por lo tanto por defecto es BLK_MAX_SEGMENTS (128), debe ser respetado y los BIO de escritura divididos en consecuencia.\n\nEn el caso de dm-flakey, dado que la emulaci\u00f3n de adici\u00f3n de zona no es requerida, el \u0027plugging\u0027 de escritura de zona de la capa de bloques no se utiliza y no se requiere divisi\u00f3n de BIO.\n\nModificar la funci\u00f3n dm_zone_bio_needs_split() para utilizar la funci\u00f3n auxiliar de la capa de bloques bio_needs_zone_write_plugging() para forzar una llamada a bio_split_to_limits() en dm_split_and_process_bio(). Esto permite a los controladores de destino DM evitar el uso de dm_accept_partial_bio() para operaciones de escritura en dispositivos DM por zonas."
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            "url": "https://git.kernel.org/stable/c/4e9fef1cf0243d665d75c371cc80be6156cd30a2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d10bf66d9f9335ffc7521b3029b114f50604cabe"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f5dd256333c08ab44b5aec4a8118cb04c0f20c54"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:57:33+00:00",
      "cve": "CVE-2025-39792",
      "id": "CVE-2025-39792",
      "initial_release_date": "2025-09-12T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dm: Always split write BIOs to zoned device limits",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39792.json",
      "version": "3"
    }
  }
}



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