CVE-2026-89615

CVE-2026-89615 · fs/ntfs3: bound page_lcns[] index by the log record

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In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound page_lcns[] index by the log record The copy_lcns loop and the redo shorten loop index page_lcns[] at j + i, where i runs up to the log record's lcns_follow. That count is checked only against the record's own length, not the target entry, so check_dp_table() (which validates the entry's lcns_follow) does not cover it: the copy_lcns entry may even be freshly allocated after that check, and find_dp() bounds j but not i. A crafted record thus overflows page_lcns[] of an otherwise valid entry. Add dp_range_ok() and reject, before each loop, any record whose run does not fit the entry. These are the only two page_lcns[] accesses indexed by the record rather than the entry, so together with the entry validation every access is now bounded. [[email protected]: original patch contained changes to the problem already handled, applied partly]

CVSS 8.4 · Élevée · EPSS 0,2% · Correctif disponible

Publication

2026-09-11T19:45:15.397Z

Mise à jour

2026-10-19T08:49:47.839Z

Pile logicielle: system

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