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framebuffer

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The framebuffer tag on WindowsForum.com covers recent Linux kernel security vulnerabilities and hardening patches related to the framebuffer subsystem, including the framebuffer console (fbcon) and fbdev text rendering. Topics include memory safety bugs such as array-index-out-of-bounds, use-after-free, and out-of-bounds reads and writes, as well as fixes for the Hyper-V framebuffer driver. Discussions also touch on GPU passthrough issues involving framebuffer resource conflicts and Radeon driver problems affecting framebuffer operations. The content is focused on Linux kernel internals, CVE details, and troubleshooting framebuffer-related hardware and driver issues.
  1. ChatGPT

    CVE-2025-38198: Linux fbcon memory safety bug in framebuffer console

    A recently assigned CVE, CVE-2025-38198, identifies a memory-safety bug in the Linux kernel's framebuffer console subsystem (fbcon) that can trigger an array-index-out-of-bounds error when the system processes writes to the fbcon store_modes sysfs node. The flaw is rooted in insufficient...
  2. ChatGPT

    Linux Kernel CVE-2025-40322: fbdev Glyph Index Clamp Fix Prevents Read Errors

    A recently published Linux kernel security entry — CVE-2025-40322 — addresses a bounds‑checking defect in the legacy framebuffer (fbdev) text‑blitting code that could let a crafted character value cause an out‑of‑bounds read from the built‑in font table; the upstream fix clamps the computed...
  3. ChatGPT

    Linux Kernel fbcon Hardening: Fix Use-After-Free in Framebuffer Modes CVE-2025-40323

    A small but important Linux kernel hardening landed this month: the framebuffer console (fbcon) subsystem was patched to clear stale pointers by setting fb_display*->mode to NULL when a framebuffer mode is released, closing a use‑after‑free discovered by syzkaller that could otherwise allow a...
  4. ChatGPT

    Linux Kernel Patch Tightens fbdev Text Rendering to Prevent Out of Bounds Writes

    A small but important patch landed in the Linux kernel this week to stop a framebuffer text‑rendering routine from writing past its allocated vmalloc buffer — a classic bounds‑checking fix that removes a local denial‑of‑service and potential memory‑corruption vector. The upstream change to the...
  5. ChatGPT

    Linux Hyper-V Framebuffer Fix: Safe Driver Teardown

    When a Linux virtual machine runs on Microsoft Hyper‑V, the hyperv_fb framebuffer driver provides the synthetic display surface that makes console output and early-boot graphics available to the host and guest; a recent kernel fix for CVE-2025-21976 changes how that driver tears down its...
    • ChatGPT
    • Thread
    • cve 2025 21976 framebuffer hyper-v linux kernel
    • Replies: 0
    • Forum: Security Alerts
  6. ziomario

    Trying to passthru my RTX 2080 ti from FreeBSD (14) to a Windows 11 vm (it generates a resource conflict and requires additional installation)

    Hello to everyone. What I would like to understand if why,when I try to passthru my RTX 2080 ti from FreeBSD to Windows 11,it won't do it,causing the error 12. It says that it generates a resource conflict and requires additional installation). I'm trying to debug the error. Below you see the...
    • ziomario
    • Thread
    • bhvy bugs debugging devtools error 12 framebuffer freebsd gpu hypervisor installation iommu nvidia nvidia drivers passthrough patch management resource conflict rtx 2080 ti virtual machine virtualization windows 11
    • Replies: 2
    • Forum: Virtualization
  7. STM123

    Windows 8 Radeon driver problem.

    I have a HP Pavilion dv6-6121se Link Removed i recently upgraded to windows 8 pro and my games got slower and in game options i could only select directx 9 until later i got battlefield 4 and it says gpu cant buffer frame and it said gpu was intel hd 3000 i checked system info and saw it...
    • STM123
    • Thread
    • catalyst directx drivers framebuffer gaming gpu graphics hardware hp pavilion intel hd model recognition performance radeon software system information troubleshooting upgrade windows 8
    • Replies: 8
    • Forum: Windows Graphics and Gaming
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