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CVE-2026-68099: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: ksmbd: restore DACL size on check_add_overflow() to avoid malformed ACL check_add_overflow() unconditionally writes the truncated sum into *d even on overflow, per its contract in include/linux/overflow.h. The four check_add_overflow() guards in set_posix_acl_entries_dacl() and set_ntacl_dacl() break out of the ACE-building loops on overflow, but the truncated *size is then consumed downstream at the end of set_ntacl_dacl(): pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size); This produces an on-wire NT ACL whose pndacl->size under-reports the bytes actually written by the preceding fill_ace_for_sid()/memcpy() calls, yielding a malformed ACL that can trigger out-of-bounds reads when re-parsed by clients or ksmbd itself. Restore *size to its pre-addition value on each overflow branch (via `*size -= ace_sz` / `size -= nt_ace_size`) so that after the break, *size once again holds the cumulative size of the successfully-written ACEs. The committed ACL is then truncated-but-self-consistent rather than malformed. The ksmbd DACL builders are the only check_add_overflow() sites found where an overflow path breaks out of a loop and the destination value is consumed afterward. The other nearby break-style cases either return -EINVAL on overflow (transport_ipc.c) or break without consuming the overflowed destination value afterward (buildid.c).

    Засегнати продукти

    • Linux Linux: 41e53a773db6342ac9a689ee5ba635c31744c9f0 преди 8f3a7a499a7d9bb1c0f33fe78c4a4594d7e307f4; 8d5729350b236896f51379588d9a690b7fafb8db преди f4fcd0c1a243d449307b887fafee23921e9db5ab; e1955a94b6f17f4b058afa955a6f187eb3ed7615 преди 0bf38372821b1526f31538a7d9811844c55c7f38; 5e7b8f3c539d69b2ed5f2408e2f75e68ce7eef43 преди 847ecd4eb3c117c3d2f13f1e7ab506543aad8183; 299f962c0b02d048fb45d248b4da493d03f3175d преди bc90144ce8bb7fcf05ad9417c7adb4e9509d9e13; 299f962c0b02d048fb45d248b4da493d03f3175d преди bbf0a8e931204ecdab494a88d43b0a24a04285c5; ef7902be3f215b6bf7babe4dc9dd9a7d57dad7a7; 6.1.175 преди 6.1.184; 6.6.136 преди 6.6.148; 6.12.84 преди 6.12.101; 6.18.25 преди 6.18.42; 7.0.2 преди 7.1
    • Linux Linux: 7.1; преди 7.1; 6.1.184 до 6.1.*; 6.6.148 до 6.6.*; 6.12.101 до 6.12.*; 6.18.42 до 6.18.*; 7.1.6 до 7.1.*; от 7.2 нататък

    История

    • 10 август 2026 Публикувано

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    Първоизточници

    CVE-2026-68099: Linux | freedomonline.bg