CVE-2025-38515 (GCVE-0-2025-38515)

Vulnerability from cvelistv5 – Published: 2025-08-16 10:55 – Updated: 2026-05-11 21:29
VLAI
Title
drm/sched: Increment job count before swapping tail spsc queue
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/sched: Increment job count before swapping tail spsc queue A small race exists between spsc_queue_push and the run-job worker, in which spsc_queue_push may return not-first while the run-job worker has already idled due to the job count being zero. If this race occurs, job scheduling stops, leading to hangs while waiting on the job’s DMA fences. Seal this race by incrementing the job count before appending to the SPSC queue. This race was observed on a drm-tip 6.16-rc1 build with the Xe driver in an SVM test case.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 27105db6c63a571b91d01e749d026105a1e63bcf , < 549a9c78c3ea6807d0dc4162a4f5ba59f217d5a0 (git)
Affected: 27105db6c63a571b91d01e749d026105a1e63bcf , < e62f51d0ec8a9baf324caf9a564f8e318d36a551 (git)
Affected: 27105db6c63a571b91d01e749d026105a1e63bcf , < ef841f8e4e1ff67817ca899bedc5ebb00847c0a7 (git)
Affected: 27105db6c63a571b91d01e749d026105a1e63bcf , < f9a4f28a4fc4ee453a92a9abbe36e26224d17749 (git)
Affected: 27105db6c63a571b91d01e749d026105a1e63bcf , < c64f5310530baf75328292f9b9f3f2961d185183 (git)
Affected: 27105db6c63a571b91d01e749d026105a1e63bcf , < e2d6547dc8b9b332f9bc00875197287a6a4db65a (git)
Affected: 27105db6c63a571b91d01e749d026105a1e63bcf , < ef58a95457466849fa7b31fd3953801a5af0f58b (git)
Affected: 27105db6c63a571b91d01e749d026105a1e63bcf , < 8af39ec5cf2be522c8eb43a3d8005ed59e4daaee (git)
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Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.4.296 , ≤ 5.4.* (semver)
Unaffected: 5.10.240 , ≤ 5.10.* (semver)
Unaffected: 5.15.189 , ≤ 5.15.* (semver)
Unaffected: 6.1.146 , ≤ 6.1.* (semver)
Unaffected: 6.6.99 , ≤ 6.6.* (semver)
Unaffected: 6.12.39 , ≤ 6.12.* (semver)
Unaffected: 6.15.7 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/sched: Incremento del recuento de trabajos antes de intercambiar la cola de cola de spsc. Existe una peque\u00f1a competencia entre spsc_queue_push y el trabajador de ejecuci\u00f3n de trabajos, en la que spsc_queue_push puede devolver un resultado no-first mientras el trabajador de ejecuci\u00f3n de trabajos ya est\u00e1 inactivo debido a que el recuento de trabajos es cero. Si se produce esta competencia, se detiene la programaci\u00f3n de trabajos, lo que provoca bloqueos mientras se espera en las barreras DMA del trabajo. Para solucionar esta competencia, incremente el recuento de trabajos antes de agregarlos a la cola de SPSC. Esta competencia se observ\u00f3 en una compilaci\u00f3n drm-tip 6.16-rc1 con el controlador Xe en un caso de prueba SVM."
          }
        ],
        "id": "CVE-2025-38515",
        "lastModified": "2026-06-17T09:17:01.497",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 4.7,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-08-16T11:15:44.637",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/549a9c78c3ea6807d0dc4162a4f5ba59f217d5a0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8af39ec5cf2be522c8eb43a3d8005ed59e4daaee"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c64f5310530baf75328292f9b9f3f2961d185183"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e2d6547dc8b9b332f9bc00875197287a6a4db65a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e62f51d0ec8a9baf324caf9a564f8e318d36a551"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ef58a95457466849fa7b31fd3953801a5af0f58b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ef841f8e4e1ff67817ca899bedc5ebb00847c0a7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f9a4f28a4fc4ee453a92a9abbe36e26224d17749"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-11-06T15:04:22+00:00",
      "cve": "CVE-2025-38515",
      "id": "CVE-2025-38515",
      "initial_release_date": "2025-08-16T00:00:00+00:00",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/sched: Increment job count before swapping tail spsc queue",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38515.json",
      "version": "3"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
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Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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