CVE-2025-40061

{
  "id": "CVE-2025-40061",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-10-28T12:15:40.493",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix race in do_task() when draining\n\nWhen do_task() exhausts its iteration budget (!ret), it sets the state\nto TASK_STATE_IDLE to reschedule, without a secondary check on the\ncurrent task->state. This can overwrite the TASK_STATE_DRAINING state\nset by a concurrent call to rxe_cleanup_task() or rxe_disable_task().\n\nWhile state changes are protected by a spinlock, both rxe_cleanup_task()\nand rxe_disable_task() release the lock while waiting for the task to\nfinish draining in the while(!is_done(task)) loop. The race occurs if\ndo_task() hits its iteration limit and acquires the lock in this window.\nThe cleanup logic may then proceed while the task incorrectly\nreschedules itself, leading to a potential use-after-free.\n\nThis bug was introduced during the migration from tasklets to workqueues,\nwhere the special handling for the draining case was lost.\n\nFix this by restoring the original pre-migration behavior. If the state is\nTASK_STATE_DRAINING when iterations are exhausted, set cont to 1 to\nforce a new loop iteration. This allows the task to finish its work, so\nthat a subsequent iteration can reach the switch statement and correctly\ntransition the state to TASK_STATE_DRAINED, stopping the task as intended."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nRDMA/rxe: Corrige una condición de carrera en do_task() al drenar\n\nCuando do_task() agota su presupuesto de iteración (!ret), establece el estado en TASK_STATE_IDLE para reprogramar, sin una verificación secundaria del task->state actual. Esto puede sobrescribir el estado TASK_STATE_DRAINING establecido por una llamada concurrente a rxe_cleanup_task() o rxe_disable_task().\n\nSi bien los cambios de estado están protegidos por un spinlock, tanto rxe_cleanup_task() como rxe_disable_task() liberan el bloqueo mientras esperan que la tarea termine de drenar en el bucle while(!is_done(task)). La condición de carrera ocurre si do_task() alcanza su límite de iteración y adquiere el bloqueo en esta ventana. La lógica de limpieza puede entonces proceder mientras la tarea se reprograma incorrectamente, lo que lleva a un potencial uso después de liberación.\n\nEste error fue introducido durante la migración de tasklets a workqueues, donde se perdió el manejo especial para el caso de drenaje.\n\nSoluciona esto restaurando el comportamiento original previo a la migración. Si el estado es TASK_STATE_DRAINING cuando las iteraciones se agotan, establece cont en 1 para forzar una nueva iteración del bucle. Esto permite que la tarea termine su trabajo, para que una iteración subsiguiente pueda alcanzar la instrucción switch y transicionar correctamente el estado a TASK_STATE_DRAINED, deteniendo la tarea según lo previsto."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_task.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "9b4b7c1f9f54120940e243251e2b1407767b3381",
              "lessThan": "85288bcf7ffe11e7b036edf91937bc62fd384076",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "9b4b7c1f9f54120940e243251e2b1407767b3381",
              "lessThan": "52edccfb555142678c836c285bf5b4ec760bd043",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "9b4b7c1f9f54120940e243251e2b1407767b3381",
              "lessThan": "660b6959c4170637f5db2279d1f71af33a49e49b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "9b4b7c1f9f54120940e243251e2b1407767b3381",
              "lessThan": "8ca7eada62fcfabf6ec1dc7468941e791c1d8729",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_task.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.5",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.5",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.112",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.53",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.17.3",
              "lessThanOrEqual": "6.17.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-15T21:56:38.354420Z",
          "id": "CVE-2025-40061",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/52edccfb555142678c836c285bf5b4ec760bd043",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/660b6959c4170637f5db2279d1f71af33a49e49b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/85288bcf7ffe11e7b036edf91937bc62fd384076",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8ca7eada62fcfabf6ec1dc7468941e791c1d8729",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}