CVE-2025-21976 (GCVE-0-2025-21976)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:47 – Updated: 2025-05-04 07:26
VLAI?
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 68a2d20b79b105f02dcbc52c211d7e62f98996b7 , < 4545e2aa121aea304d33903099c03e29ed4fe50a (git)
Affected: 68a2d20b79b105f02dcbc52c211d7e62f98996b7 , < a7b583dc99c6cf4a96877017be1d08247e1ef2c7 (git)
Affected: 68a2d20b79b105f02dcbc52c211d7e62f98996b7 , < ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb (git)
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    Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 6.12.20 , ≤ 6.12.* (semver)
Unaffected: 6.13.8 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/hyperv_fb.c"
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          "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."
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        "dateUpdated": "2025-05-04T07:26:20.310Z",
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        {
          "url": "https://git.kernel.org/stable/c/ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb"
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      "title": "fbdev: hyperv_fb: Allow graceful removal of framebuffer",
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    "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"
  },
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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\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.10\",\"versionEndExcluding\":\"6.12.20\",\"matchCriteriaId\":\"AE704F9A-FF6F-4BA0-91F8-FD065BD23F1E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.8\",\"matchCriteriaId\":\"0A20D4D7-B329-4C68-B662-76062EA7DCF0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"186716B6-2B66-4BD0-852E-D48E71C0C85F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D3E781C-403A-498F-9DA9-ECEE50F41E75\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"66619FB8-0AAF-4166-B2CF-67B24143261D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"D3D6550E-6679-4560-902D-AF52DCFE905B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"45B90F6B-BEC7-4D4E-883A-9DBADE021750\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"1759FFB7-531C-41B1-9AE1-FD3D80E0D920\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4545e2aa121aea304d33903099c03e29ed4fe50a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a7b583dc99c6cf4a96877017be1d08247e1ef2c7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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  • 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 patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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