GHSA-9VFF-P882-X7QP
Vulnerability from github – Published: 2025-04-01 18:30 – Updated: 2025-10-30 21:30In 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] [ 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.
{
"affected": [],
"aliases": [
"CVE-2025-21976"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-04-01T16:15:28Z",
"severity": "MODERATE"
},
"details": "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.",
"id": "GHSA-9vff-p882-x7qp",
"modified": "2025-10-30T21:30:41Z",
"published": "2025-04-01T18:30:54Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21976"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4545e2aa121aea304d33903099c03e29ed4fe50a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a7b583dc99c6cf4a96877017be1d08247e1ef2c7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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