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CVE-2026-31716: Linux

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, без вход и след действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate rec->used in journal-replay file record check check_file_record() validates rec->total against the record size but never validates rec->used. The do_action() journal-replay handlers read rec->used from disk and use it to compute memmove lengths: DeleteAttribute: memmove(attr, ..., used - asize - roff) CreateAttribute: memmove(..., attr, used - roff) change_attr_size: memmove(..., used - PtrOffset(rec, next)) When rec->used is smaller than the offset of a validated attribute, or larger than the record size, these subtractions can underflow allowing us to copy huge amounts of memory in to a 4kb buffer, generally considered a bad idea overall. This requires a corrupted filesystem, which isn't a threat model the kernel really needs to worry about, but checking for such an obvious out-of-bounds value is good to keep things robust, especially on journal replay Fix this up by bounding rec->used correctly. This is much like commit b2bc7c44ed17 ("fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot") which checked different values in this same switch statement.

    Засегнати продукти

    • Linux Linux: b46acd6a6a627d876898e1c84d3f84902264b445 преди 8e64d33198b5a0fb14a452708bad844f94f03b2c; b46acd6a6a627d876898e1c84d3f84902264b445 преди 1393a467a9607e62123806de7d4c3a3e54e396a9; b46acd6a6a627d876898e1c84d3f84902264b445 преди f90b8a1798b750755a9e9aee66678f0a1820bbaf; b46acd6a6a627d876898e1c84d3f84902264b445 преди 4b1613d7e2deda831a97e427d1ea586e50fe1be5; b46acd6a6a627d876898e1c84d3f84902264b445 преди 0112e6279420d4005b3d57af36fb45c01b8d0116; b46acd6a6a627d876898e1c84d3f84902264b445 преди f79d0403ea20a81bc29105bba54fbcab54e8c403; b46acd6a6a627d876898e1c84d3f84902264b445 преди 0ca0485e4b2e837ebb6cbd4f2451aba665a03e4b
    • Linux Linux: 5.15; преди 5.15; 5.15.209 до 5.15.*; 6.1.175 до 6.1.*; 6.6.136 до 6.6.*; 6.12.84 до 6.12.*; 6.18.25 до 6.18.*; 7.0.2 до 7.0.*; от 7.1 нататък

    История

    • 1 май 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-31716: Linux | freedomonline.bg