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CVE-2026-72086

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

scsi: xen: scsiback: Free the command tag on the TMR submit-failure path

scsiback_device_action() obtains a command tag in scsiback_get_pend_req() and submits a task-management request with target_submit_tmr(). When target_submit_tmr() fails it returns < 0 and scsiback jumps to the err: label, which sends a response but frees nothing, leaking the tag.

Impact: a pvSCSI guest can leak the command tags of a LUN's session, stopping the LUN, by issuing VSCSIIF_ACT_SCSI_ABORT or RESET requests whenever target_submit_tmr() fails.

transport_generic_free_cmd() cannot be used here. By the time target_submit_tmr() returns an error it has already run __target_init_cmd() (so se_cmd->cmd_kref is one, not zero), and on its target_get_sess_cmd() error path it has freed se_cmd->se_tmr_req via core_tmr_release_req() while leaving SCF_SCSI_TMR_CDB set and the pointer dangling. Letting the command release run target_free_cmd_mem() would then double-free se_tmr_req.

Leer descripción completaMostrar menos

Use the same helper, which returns just the tag, on this path too.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-72086",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
              "lessThan": "4567ce79fe2f84c3dcc3a91b22a377cf482d33ad",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
              "lessThan": "6c01f0439098f00a64b246dc27479602201382f7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
              "lessThan": "18d4f86816592586b38513543b5e1f9553bc271f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
              "lessThan": "fbc1bdede66d0f2cde83b75d6524ce1a815bb69f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
              "lessThan": "255fb7b0cdc947b1c01929c7f133281342a3a6b5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
              "lessThan": "1357fb32d42ad8da193e6da285f09e6452feabda",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
              "lessThan": "66aefc277ebb796ec285d550305535dc3fc0179f",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/xen/xen-scsiback.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.6",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/xen/xen-scsiback.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:21:22.593",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1357fb32d42ad8da193e6da285f09e6452feabda",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/18d4f86816592586b38513543b5e1f9553bc271f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/255fb7b0cdc947b1c01929c7f133281342a3a6b5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4567ce79fe2f84c3dcc3a91b22a377cf482d33ad",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/66aefc277ebb796ec285d550305535dc3fc0179f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6c01f0439098f00a64b246dc27479602201382f7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fbc1bdede66d0f2cde83b75d6524ce1a815bb69f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: xen: scsiback: Free the command tag on the TMR submit-failure path\n\nscsiback_device_action() obtains a command tag in\nscsiback_get_pend_req() and submits a task-management request with\ntarget_submit_tmr(). When target_submit_tmr() fails it returns < 0 and\nscsiback jumps to the err: label, which sends a response but frees\nnothing, leaking the tag.\n\nImpact: a pvSCSI guest can leak the command tags of a LUN's session,\nstopping the LUN, by issuing VSCSIIF_ACT_SCSI_ABORT or RESET requests\nwhenever target_submit_tmr() fails.\n\ntransport_generic_free_cmd() cannot be used here. By the time\ntarget_submit_tmr() returns an error it has already run\n__target_init_cmd() (so se_cmd->cmd_kref is one, not zero), and on its\ntarget_get_sess_cmd() error path it has freed se_cmd->se_tmr_req via\ncore_tmr_release_req() while leaving SCF_SCSI_TMR_CDB set and the\npointer dangling. Letting the command release run target_free_cmd_mem()\nwould then double-free se_tmr_req.\n\nUse the same helper, which returns just the tag, on this path too."
    }
  ],
  "lastModified": "2026-08-17T06:18:07.513",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}