CVE-2012-2100
HighSummary
Funkcja ext4_fill_flex_info w jądrze Linux przed wersją 3.2.2 na platformie x86 oraz innych nieokreślonych platformach, pozwala zdalnym atakującym, wspieranym przez użytkownika, na wywołanie niespójnych danych grup systemu plików i potencjalnie spowodowanie odmowy usługi poprzez uszkodzony system plików ext4 zawierający superblok z dużym rozmiarem grupy FLEX_BG.
Risk Assessment
Podatność ta może prowadzić do awarii systemu plików, co skutkuje odmową usługi i może wpłynąć na dostępność krytycznych zasobów w organizacji.
Recommendation
Zaleca się aktualizację jądra Linux do wersji 3.2.2 lub nowszej, aby usunąć tę podatność oraz monitorowanie systemów pod kątem nieautoryzowanych zmian w systemie plików.
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Original NVD description (English source)
The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 3.2.2, on the x86 platform and unspecified other platforms, allows user-assisted remote attackers to trigger inconsistent filesystem-groups data and possibly cause a denial of service via a malformed ext4 filesystem containing a super block with a large FLEX_BG group size (aka s_log_groups_per_flex value). NOTE: this vulnerability exists because of an incomplete fix for CVE-2009-4307.

