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CVE-2026-72094

Estado: RecibidaSin puntuar—

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

dma-buf: dma-fence: Fix potential NULL pointer dereference

The commit mentioned in the fixes tag below introduced a mechanism through which fence producers can fully decouple from fence consumers. This, desirable, mechanism is based on the fence's signaled-bit as the "decoupling point".

A sophisticated interaction between RCU and atomic instructions attempts to ensure that fence consumers can still interact with fence producers through the dma_fence_ops (callback pointers into the producer).

This is the desired behavior: to check for decoupling, the signaled-bit is first checked. If it's not yet signaled, RCU ensures that the ops pointer cannot yet be NULL.

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Hereby, dma_fence_signal_timestamp_locked() first sets the signaled-bit, and then sets the ops pointer to NULL. Readers first load the ops pointer, and then check through the signaled-bit whether the pointer can legally be accessed.

These set and load operations could occur out of order on weakly ordered platforms. This problem can be solved very elegantly by using the ops pointer itself as the synchronization point. The pointer is either NULL, or cannot become NULL while it is being used thanks to RCU.

Replace the signaled-bit check in dma_fence_timeline_name() and dma_fence_driver_name().

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-2026-72094",
  "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": "f4cc3ab824d6772a48ca9d9c74ac623b3309985d",
              "lessThan": "15ecfdf0ef6f6d874d0a26690d300857b39ebfd0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f4cc3ab824d6772a48ca9d9c74ac623b3309985d",
              "lessThan": "035219a760edb35ae9a9e96beba7f122e26a997b",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/dma-buf/dma-fence.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "7.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/dma-buf/dma-fence.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:21:23.477",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/035219a760edb35ae9a9e96beba7f122e26a997b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/15ecfdf0ef6f6d874d0a26690d300857b39ebfd0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf: dma-fence: Fix potential NULL pointer dereference\n\nThe commit mentioned in the fixes tag below introduced a mechanism\nthrough which fence producers can fully decouple from fence consumers.\nThis, desirable, mechanism is based on the fence's signaled-bit as the\n\"decoupling point\".\n\nA sophisticated interaction between RCU and atomic instructions attempts\nto ensure that fence consumers can still interact with fence producers\nthrough the dma_fence_ops (callback pointers into the producer).\n\nThis is the desired behavior: to check for decoupling, the signaled-bit\nis first checked. If it's not yet signaled, RCU ensures that the ops\npointer cannot yet be NULL.\n\nHereby, dma_fence_signal_timestamp_locked() first sets the signaled-bit,\nand then sets the ops pointer to NULL. Readers first load the ops\npointer, and then check through the signaled-bit whether the pointer can\nlegally be accessed.\n\nThese set and load operations could occur out of order on weakly ordered\nplatforms. This problem can be solved very elegantly by using the ops\npointer itself as the synchronization point. The pointer is either NULL,\nor cannot become NULL while it is being used thanks to RCU.\n\nReplace the signaled-bit check in dma_fence_timeline_name() and\ndma_fence_driver_name()."
    }
  ],
  "lastModified": "2026-08-17T06:18:08.327",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}