CVE-2025-40322

Summary

In the Linux kernel, the following vulnerability has been resolved:

fbdev: bitblit: bound-check glyph index in bit_putcs*

bit_putcs_aligned()/unaligned() derived the glyph pointer from the character value masked by 0xff/0x1ff, which may exceed the actual font's glyph count and read past the end of the built-in font array. Clamp the index to the actual glyph count before computing the address.

This fixes a global out-of-bounds read reported by syzbot.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a10cede006f9614b465cf25609a8753efbfd45ccaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0998a6cb232674408a03e8561dc15aa266b2f53baffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < db5c9a162d2f42bcc842b76b3d935dcc050a0eecaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c12003bf91fdff381c55ef54fef3e961a5af2545affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9ba1a7802ca9a2590cef95b253e6526f4364477faffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 901f44227072be60812fe8083e83e1533c04eed1affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < efaf89a75a29b2d179bf4fe63ca62852e93ad620affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 18c4ef4e765a798b47980555ed665d78b71aeadfaffected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux5.4.302 <= 5.4.*unaffected
LinuxLinux5.10.247 <= 5.10.*unaffected
LinuxLinux5.15.197 <= 5.15.*unaffected
LinuxLinux6.1.159 <= 6.1.*unaffected
LinuxLinux6.6.117 <= 6.6.*unaffected
LinuxLinux6.12.58 <= 6.12.*unaffected
LinuxLinux6.17.8 <= 6.17.*unaffected
LinuxLinux6.18 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References