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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2025-38685

fbdev: Fix vmalloc out-of-bounds write in fast_imageblit

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: fbdev: Fix vmalloc out-of-bounds write in fast_imageblit This issue triggers when a userspace program does an ioctl FBIOPUT_CON2FBMAP by passing console number and frame buffer number. Ideally this maps console to frame buffer and updates the screen if console is visible. As part of mapping it has to do resize of console according to frame buffer info. if this resize fails and returns from vc_do_resize() and continues further. At this point console and new frame buffer are mapped and sets display vars. Despite failure still it continue to proceed updating the screen at later stages where vc_data is related to previous frame buffer and frame buffer info and display vars are mapped to new frame buffer and eventully leading to out-of-bounds write in fast_imageblit(). This bheviour is excepted only when fg_console is equal to requested console which is a visible console and updates screen with invalid struct references in fbcon_putcs().

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 078e62bffca4b7e72e8f3550eb063ab981c36c7aaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 4c4d7ddaf1d43780b106bedc692679f965dc5a3aaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 27b118aebdd84161c8ff5ce49d9d536f2af10754affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ed9b8e5016230868c8d813d9179523f729fec8c6affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 56701bf9eeb63219e378cb7fcbd066ea4eaeeb50affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < cfec17721265e72e50cc69c6004fe3475cd38df2affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < af0db3c1f898144846d4c172531a199bb3ca375daffected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 5.15.190 to ≤ 5.15.*unaffected
  • 6.1.149 to ≤ 6.1.*unaffected
  • 6.6.103 to ≤ 6.6.*unaffected
  • 6.12.43 to ≤ 6.12.*unaffected
  • 6.15.11 to ≤ 6.15.*unaffected
  • 6.16.2 to ≤ 6.16.*unaffected
  • 6.17 to ≤ *unaffected

References