PT-2026-113955 · Eclipse Foundation · Guix
CVSS v4.0
8.4
Alta
| Vetor | AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
The GUIX binary resource (theme) loader sizes its arena and populates it in two separate passes that traverse the resource file with independent cursor arithmetic. Because
gx page header data size is never validated against the glyph data a page actually contains, the two passes can read different page headers for the same font page, derive different glyph counts, and reserve less than the load pass writes. The excess is written past the end of the arena, with content taken verbatim from the file.The overflowed buffer is allocated by GUIX itself, through
gx system memory allocator, rather than supplied by the caller. The public API gx binres theme load() takes no size parameter, so no amount of caller diligence prevents this.Reproduces in the shipped default configuration;
GX BINARY RESOURCE SUPPORT is enabled by default.Correção
Memory Corruption
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