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CVE-2026-52944: 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: fix FSCTL permission bypass by adding a permission check for FSCTL_SET_SPARSE FSCTL_SET_SPARSE in fsctl_set_sparse() modifies the file's sparse attribute and saves it through xattr without any permission checks. This exposes two issues: 1) A client on a read-only share can change the sparse attribute on files it opened, even though the share is read-only. Other FSCTL write operations already check test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE), but FSCTL_SET_SPARSE does not. 2) Even on writable shares, clients without FILE_WRITE_DATA or FILE_WRITE_ATTRIBUTES access should not modify the sparse attribute. Similar handle-level checks exist in other functions but are missing here. Add both share-level writable check and per-handle access check. Use goto out on error to avoid leaking file references.

    Засегнати продукти

    • Linux Linux: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди ef664475c1bf1a27d45dae6848ca9c9c4d86853f; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 3a9a0a1c38ef90788f5d7c4b29903c8b220f744a; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 3127a884525dc8ca4def73254bfcd3ccef0bf812; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди c5ab11263e3c89aa7989afc5374ef7743e092fd0; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди de9eb0b44fa9123170e6245b49638e0e453c10f8; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди aef151bcfa494bfe983669de2726734b534adb73; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди cc57232cae23c0df91b4a59d0f519141ce9b5b02
    • Linux Linux: 5.15; преди 5.15; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.143 до 6.6.*; 6.12.110 до 6.12.*; 6.18.35 до 6.18.*; 7.0.12 до 7.0.*; от 7.1 нататък

    История

    • 24 юни 2026 Публикувано

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    CVE-2026-52944: Linux | freedomonline.bg