CVE-2023-53421
MediumCVSS 5.5Summary
W jądrze systemu Linux zidentyfikowano podatność związaną z niewłaściwą inicjalizacją pól w strukturze blkg_iostat_set podczas alokacji. Problemy te mogą prowadzić do paniki jądra z powodu dostępu do wskaźnika NULL oraz problemów w trybie debugowania.
Risk Assessment
Organizacja może doświadczyć awarii systemu operacyjnego, co prowadzi do przestojów i potencjalnych utrat danych. Niewłaściwe działanie w trybie debugowania może również utrudnić diagnozowanie problemów.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, aby usunąć tę podatność i zapewnić prawidłową inicjalizację struktur. Regularne monitorowanie i testowanie systemu w celu wykrycia potencjalnych problemów również jest wskazane.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats() When blkg_alloc() is called to allocate a blkcg_gq structure with the associated blkg_iostat_set's, there are 2 fields within blkg_iostat_set that requires proper initialization - blkg & sync. The former field was introduced by commit 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()") while the later one was introduced by commit f73316482977 ("blk-cgroup: reimplement basic IO stats using cgroup rstat"). Unfortunately those fields in the blkg_iostat_set's are not properly re-initialized when they are cleared in v1's blkcg_reset_stats(). This can lead to a kernel panic due to NULL pointer access of the blkg pointer. The missing initialization of sync is less problematic and can be a problem in a debug kernel due to missing lockdep initialization. Fix these problems by re-initializing them after memory clearing.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS