High 7.8Published Apr 1, 2025

CVE-2025-21976fbdev: hyperv_fb: Allow graceful removal of framebuffer

Updated under an hour ago (2026-10-19 07:10 UTC)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 68a2d20b79b105f02dcbc52c211d7e62f98996b7 before 4545e2aa121aea304d33903099c03e29ed4fe50a; from 68a2d20b79b105f02dcbc52c211d7e62f98996b7 before a7b583dc99c6cf4a96877017be1d08247e1ef2c7; from 68a2d20b79b105f02dcbc52c211d7e62f98996b7 before ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb	CNA record
linux linux_kernel linux:linux_kernel	from 3.10 before 6.12.20; from 6.13 before 6.13.8; 6.14; 6.14; 6.14; 6.14; 6.14; 6.14	NVD

References

https://git.kernel.org/stable/c/4545e2aa121aea304d33903099c03e29ed4fe50apatch
https://git.kernel.org/stable/c/a7b583dc99c6cf4a96877017be1d08247e1ef2c7patch
https://git.kernel.org/stable/c/ea2f45ab0e53b255f72c85ccd99e2b394fc5fcebpatch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.