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CVE-2026-64400: Linux

8.6

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 по мрежата, без особени условия, без вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent path traversal bypass by restricting caseless retry ksmbd_vfs_path_lookup() enforces LOOKUP_BENEATH to restrict path resolution within the share root. When a crafted path attempts to escape the share boundary using parent-directory components ('..'), vfs_path_parent_lookup() detects this and immediately fails, returning -EXDEV. However, a bug exists in __ksmbd_vfs_kern_path() under caseless mode. The function fails to intercept the -EXDEV error and erroneously falls through to the caseless retry logic, which is intended only for genuinely missing files. During this retry process, the path is reconstructed, leading to an unintended LOOKUP_BENEATH bypass that allows write-capable users to create zero-length files or directories outside the exported share. Fix this by ensuring that the execution only proceeds to the caseless lookup retry when the error is specifically -ENOENT. Any other errors, such as -EXDEV from a path traversal attempt, must be returned immediately.

    Засегнати продукти

    • Linux Linux: 6927ffe7479c72e7ebf885507227266a75f7c97d преди 21f050439db157f2afcc19885dec14549ca6ffc0; 74d7970febf7e9005375aeda0df821d2edffc9f7 преди eec1dd2586c4016b7555a5d047db2b3756459fb2; 74d7970febf7e9005375aeda0df821d2edffc9f7 преди a1c331d98313380c38f616c8b28b890ec8ef9c28; 74d7970febf7e9005375aeda0df821d2edffc9f7 преди cfb5a56c218888f9d74165dff0c282cd0be97983; 74d7970febf7e9005375aeda0df821d2edffc9f7 преди 8c9a4f1327eb71efbf14842e7b8a6d965077eb67; 74d7970febf7e9005375aeda0df821d2edffc9f7 преди 54bab9ba5a9f156ffa9324fcbe5a356fd0242f95; 019aae488dbc67c97a33db03652e20e2c9e3afa7; ef6cc1c465786b3e4e735d1ab8b616b3e94402df; 6.1.71 преди 6.1.191; 5.15.145 преди 5.16; 6.3.10 преди 6.4
    • Linux Linux: 6.4; преди 6.4; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 6.18.57 до 6.18.*; 7.1.4 до 7.1.*; от 7.2 нататък

    История

    • 25 юли 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-64400: Linux | freedomonline.bg