FKIE_CVE-2026-74646

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke When an invoke is interrupted by a signal, wait_for_completion_interruptible() returns -ERESTARTSYS and fastrpc_internal_invoke() moves every buffer from fl->mmaps onto cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk runs without holding fl->lock, the lock that serialises fl->mmaps in fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else. Take fl->lock around the move, matching every other fl->mmaps accessor.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f265e405e5ef85030c3777262e18bb556bc8724
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a902fe1f80f58a2335b6be1131866f827ec44d1a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/af6345159abcbaa550518f31990d2a9558c2d369
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b85a0e91d7d6cd06a53c881a46f749cfcef416a2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/efd02f8d1a7449f15809bc18d3cd41aafea75d7e
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/fastrpc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3f265e405e5ef85030c3777262e18bb556bc8724",
              "status": "affected",
              "version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
              "versionType": "git"
            },
            {
              "lessThan": "a902fe1f80f58a2335b6be1131866f827ec44d1a",
              "status": "affected",
              "version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
              "versionType": "git"
            },
            {
              "lessThan": "af6345159abcbaa550518f31990d2a9558c2d369",
              "status": "affected",
              "version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
              "versionType": "git"
            },
            {
              "lessThan": "efd02f8d1a7449f15809bc18d3cd41aafea75d7e",
              "status": "affected",
              "version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
              "versionType": "git"
            },
            {
              "lessThan": "b85a0e91d7d6cd06a53c881a46f749cfcef416a2",
              "status": "affected",
              "version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/fastrpc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: take fl-\u003elock when moving mmaps on interrupted invoke\n\nWhen an invoke is interrupted by a signal,\nwait_for_completion_interruptible() returns -ERESTARTSYS and\nfastrpc_internal_invoke() moves every buffer from fl-\u003emmaps onto\ncctx-\u003einvoke_interrupted_mmaps. This list_del()/list_add_tail() walk\nruns without holding fl-\u003elock, the lock that serialises fl-\u003emmaps in\nfastrpc_req_mmap() and fastrpc_req_munmap() everywhere else.\n\nTake fl-\u003elock around the move, matching every other fl-\u003emmaps accessor."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmisc: fastrpc: tomar fl -\u003e lock al mover mmaps en una invocaci\u00f3n interrumpida\n\nCuando una invocaci\u00f3n es interrumpida por una se\u00f1al, wait_for_completion_interruptible() devuelve -ERESTARTSYS y fastrpc_internal_invoke() mueve cada b\u00fafer de fl -\u003e mmaps a cctx -\u003e invoke_interrupted_mmaps. Este recorrido de list_del()/list_add_tail() se ejecuta sin mantener fl -\u003e lock, el bloqueo que serializa fl -\u003e mmaps en fastrpc_req_mmap() y fastrpc_req_munmap() en cualquier otro lugar.\n\nTomar fl -\u003e lock durante el movimiento, igualando a cualquier otro accesor de fl -\u003e mmaps."
    }
  ],
  "id": "CVE-2026-74646",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:37.940",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3f265e405e5ef85030c3777262e18bb556bc8724"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a902fe1f80f58a2335b6be1131866f827ec44d1a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/af6345159abcbaa550518f31990d2a9558c2d369"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b85a0e91d7d6cd06a53c881a46f749cfcef416a2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/efd02f8d1a7449f15809bc18d3cd41aafea75d7e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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