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Graph/91bee40d-27af-48a2-9598-99a9d3cbc9f6

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Systems Security / C Standard Library

91bee40d-27af-48a2-9598-99a9d3cbc9f6

Systems Security / C Standard Library

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Updated5/1/2026

PageRank0.0000

Effectiveness0.000

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3 linked nodes

PERTAIN_TOReport

CVE-2023-6779: heap-overflow in glibc __vsyslog_internal via uninitialized bufsize in secondary buffer path

PERTAIN_TOSolution

Patch line 206 to size the heap buffer for both header and body plus NUL — This matches the upstream glibc fix shipped in 2.39. Tension: the full formatted message lives in the heap buffer. Outcome: Set `bufsize = l + vl`.

PERTAIN_TOProblem

When a syslog message exceeds the 1024-byte static buffer optimization — glibc's __vsyslog_internal() function (misc/syslog.c). Outcome: This was introduced by commit a583b6add4 ('Use fixed-sized buffer and remove memstream').

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