CVE-2025-21976 (GCVE-0-2025-21976)
Vulnerability from cvelistv5
Published
2025-04-01 15:47
Modified
2025-05-04 07:26
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fbdev: hyperv_fb: Allow graceful removal of framebuffer When a Hyper-V framebuffer device is unbind, hyperv_fb driver tries to release the framebuffer forcefully. If this framebuffer is in use it produce the following WARN and hence this framebuffer is never released. [ 44.111220] WARNING: CPU: 35 PID: 1882 at drivers/video/fbdev/core/fb_info.c:70 framebuffer_release+0x2c/0x40 < snip > [ 44.111289] Call Trace: [ 44.111290] <TASK> [ 44.111291] ? show_regs+0x6c/0x80 [ 44.111295] ? __warn+0x8d/0x150 [ 44.111298] ? framebuffer_release+0x2c/0x40 [ 44.111300] ? report_bug+0x182/0x1b0 [ 44.111303] ? handle_bug+0x6e/0xb0 [ 44.111306] ? exc_invalid_op+0x18/0x80 [ 44.111308] ? asm_exc_invalid_op+0x1b/0x20 [ 44.111311] ? framebuffer_release+0x2c/0x40 [ 44.111313] ? hvfb_remove+0x86/0xa0 [hyperv_fb] [ 44.111315] vmbus_remove+0x24/0x40 [hv_vmbus] [ 44.111323] device_remove+0x40/0x80 [ 44.111325] device_release_driver_internal+0x20b/0x270 [ 44.111327] ? bus_find_device+0xb3/0xf0 Fix this by moving the release of framebuffer and assosiated memory to fb_ops.fb_destroy function, so that framebuffer framework handles it gracefully. While we fix this, also replace manual registrations/unregistration of framebuffer with devm_register_framebuffer.
References
Impacted products
Vendor Product Version
Linux Linux Version: 68a2d20b79b105f02dcbc52c211d7e62f98996b7
Version: 68a2d20b79b105f02dcbc52c211d7e62f98996b7
Version: 68a2d20b79b105f02dcbc52c211d7e62f98996b7
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/hyperv_fb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4545e2aa121aea304d33903099c03e29ed4fe50a",
              "status": "affected",
              "version": "68a2d20b79b105f02dcbc52c211d7e62f98996b7",
              "versionType": "git"
            },
            {
              "lessThan": "a7b583dc99c6cf4a96877017be1d08247e1ef2c7",
              "status": "affected",
              "version": "68a2d20b79b105f02dcbc52c211d7e62f98996b7",
              "versionType": "git"
            },
            {
              "lessThan": "ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb",
              "status": "affected",
              "version": "68a2d20b79b105f02dcbc52c211d7e62f98996b7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/hyperv_fb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.10"
            },
            {
              "lessThan": "3.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.20",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.8",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: hyperv_fb: Allow graceful removal of framebuffer\n\nWhen a Hyper-V framebuffer device is unbind, hyperv_fb driver tries to\nrelease the framebuffer forcefully. If this framebuffer is in use it\nproduce the following WARN and hence this framebuffer is never released.\n\n[   44.111220] WARNING: CPU: 35 PID: 1882 at drivers/video/fbdev/core/fb_info.c:70 framebuffer_release+0x2c/0x40\n\u003c snip \u003e\n[   44.111289] Call Trace:\n[   44.111290]  \u003cTASK\u003e\n[   44.111291]  ? show_regs+0x6c/0x80\n[   44.111295]  ? __warn+0x8d/0x150\n[   44.111298]  ? framebuffer_release+0x2c/0x40\n[   44.111300]  ? report_bug+0x182/0x1b0\n[   44.111303]  ? handle_bug+0x6e/0xb0\n[   44.111306]  ? exc_invalid_op+0x18/0x80\n[   44.111308]  ? asm_exc_invalid_op+0x1b/0x20\n[   44.111311]  ? framebuffer_release+0x2c/0x40\n[   44.111313]  ? hvfb_remove+0x86/0xa0 [hyperv_fb]\n[   44.111315]  vmbus_remove+0x24/0x40 [hv_vmbus]\n[   44.111323]  device_remove+0x40/0x80\n[   44.111325]  device_release_driver_internal+0x20b/0x270\n[   44.111327]  ? bus_find_device+0xb3/0xf0\n\nFix this by moving the release of framebuffer and assosiated memory\nto fb_ops.fb_destroy function, so that framebuffer framework handles\nit gracefully.\n\nWhile we fix this, also replace manual registrations/unregistration of\nframebuffer with devm_register_framebuffer."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:26:20.310Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4545e2aa121aea304d33903099c03e29ed4fe50a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7b583dc99c6cf4a96877017be1d08247e1ef2c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb"
        }
      ],
      "title": "fbdev: hyperv_fb: Allow graceful removal of framebuffer",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21976",
    "datePublished": "2025-04-01T15:47:07.120Z",
    "dateReserved": "2024-12-29T08:45:45.798Z",
    "dateUpdated": "2025-05-04T07:26:20.310Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21976\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-01T16:15:28.973\",\"lastModified\":\"2025-04-01T20:26:01.990\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfbdev: hyperv_fb: Allow graceful removal of framebuffer\\n\\nWhen a Hyper-V framebuffer device is unbind, hyperv_fb driver tries to\\nrelease the framebuffer forcefully. If this framebuffer is in use it\\nproduce the following WARN and hence this framebuffer is never released.\\n\\n[   44.111220] WARNING: CPU: 35 PID: 1882 at drivers/video/fbdev/core/fb_info.c:70 framebuffer_release+0x2c/0x40\\n\u003c snip \u003e\\n[   44.111289] Call Trace:\\n[   44.111290]  \u003cTASK\u003e\\n[   44.111291]  ? show_regs+0x6c/0x80\\n[   44.111295]  ? __warn+0x8d/0x150\\n[   44.111298]  ? framebuffer_release+0x2c/0x40\\n[   44.111300]  ? report_bug+0x182/0x1b0\\n[   44.111303]  ? handle_bug+0x6e/0xb0\\n[   44.111306]  ? exc_invalid_op+0x18/0x80\\n[   44.111308]  ? asm_exc_invalid_op+0x1b/0x20\\n[   44.111311]  ? framebuffer_release+0x2c/0x40\\n[   44.111313]  ? hvfb_remove+0x86/0xa0 [hyperv_fb]\\n[   44.111315]  vmbus_remove+0x24/0x40 [hv_vmbus]\\n[   44.111323]  device_remove+0x40/0x80\\n[   44.111325]  device_release_driver_internal+0x20b/0x270\\n[   44.111327]  ? bus_find_device+0xb3/0xf0\\n\\nFix this by moving the release of framebuffer and assosiated memory\\nto fb_ops.fb_destroy function, so that framebuffer framework handles\\nit gracefully.\\n\\nWhile we fix this, also replace manual registrations/unregistration of\\nframebuffer with devm_register_framebuffer.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fbdev: hyperv_fb: Permite la eliminaci\u00f3n ordenada del framebuffer. Cuando se desvincula un dispositivo framebuffer de Hyper-V, el controlador hyperv_fb intenta liberarlo forzosamente. Si este framebuffer est\u00e1 en uso, genera la siguiente advertencia y, por lo tanto, nunca se libera. [44.111220] ADVERTENCIA: CPU: 35 PID: 1882 en drivers/video/fbdev/core/fb_info.c:70 framebuffer_release+0x2c/0x40 \u0026lt; snip \u0026gt; [44.111289] Rastreo de llamadas: [ 44.111290]  [ 44.111291] ? show_regs+0x6c/0x80 [ 44.111295] ? __warn+0x8d/0x150 [ 44.111298] ? framebuffer_release+0x2c/0x40 [ 44.111300] ? report_bug+0x182/0x1b0 [ 44.111303] ? handle_bug+0x6e/0xb0 [ 44.111306] ? exc_invalid_op+0x18/0x80 [ 44.111308] ? asm_exc_invalid_op+0x1b/0x20 [ 44.111311] ? framebuffer_release+0x2c/0x40 [ 44.111313] ? hvfb_remove+0x86/0xa0 [hyperv_fb] [ 44.111315] vmbus_remove+0x24/0x40 [hv_vmbus] [ 44.111323] device_remove+0x40/0x80 [ 44.111325] device_release_driver_internal+0x20b/0x270 [ 44.111327] ? bus_find_device+0xb3/0xf0. Solucione esto trasladando la liberaci\u00f3n del framebuffer y la memoria asociada a la funci\u00f3n fb_ops.fb_destroy, para que el framework del framebuffer lo gestione correctamente. Mientras lo solucionamos, tambi\u00e9n reemplace el registro/desregistro manual del framebuffer con devm_register_framebuffer.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4545e2aa121aea304d33903099c03e29ed4fe50a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7b583dc99c6cf4a96877017be1d08247e1ef2c7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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