Answer in brief
CVE-2025-21976 records a High severity (CVSS 7.8) vulnerability in fbdev: hyperv_fb: Allow graceful removal of framebuffer. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=68a2d20b79b105f02dcbc52c211d7e62f98996b7 <4545e2aa121aea304d33903099c03e29ed4fe50a || >=68a2d20b79b105f02dcbc52c211d7e62f98996b7 <a7b583dc99c6cf4a96877017be1d08247e1ef2c7 || >=68a2d20b79b105f02dcbc52c211d7e62f98996b7 <ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb | 4545e2aa121aea304d33903099c03e29ed4fe50a, a7b583dc99c6cf4a96877017be1d08247e1ef2c7, ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb |
| Linux/Linuxgeneric | 3.10 | Not reported |
| Linux/Linuxgeneric | >=68a2d20b79b105f02dcbc52c211d7e62f98996b7 <b1a86a5ab0d44160534f495a3630646092d98e27 || >=68a2d20b79b105f02dcbc52c211d7e62f98996b7 <4545e2aa121aea304d33903099c03e29ed4fe50a || >=68a2d20b79b105f02dcbc52c211d7e62f98996b7 <a7b583dc99c6cf4a96877017be1d08247e1ef2c7 || >=68a2d20b79b105f02dcbc52c211d7e62f98996b7 <ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb | b1a86a5ab0d44160534f495a3630646092d98e27, 4545e2aa121aea304d33903099c03e29ed4fe50a, a7b583dc99c6cf4a96877017be1d08247e1ef2c7, ea2f45ab0e53b255f72c85ccd99e2b394fc5fceb |
Published upstream
Apr 1, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.