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CVE-2026-93800: Linux

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CVSS

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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: btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol() If during relocation we fail in insert_dirty_subvol() because btrfs_update_reloc_root() returned an error, we will leave a root's reloc_root field pointing to a reloc root that was freed instead of NULL, resulting later in a use-after-free, or double free attempt during unmount. The sequence of steps is this: 1) During relocation the call to btrfs_update_reloc_root() in insert_dirty_subvol() fails, so insert_dirty_subvol() returns the error to merge_reloc_root() without adding the root to the list rc->dirty_subvol_roots; 2) Then merge_reloc_root() aborts the current transaction because insert_dirty_subvol() returned an error; 3) Up the call chain, merge_reloc_roots() gets the error, adds the reloc root for root X to the local reloc_roots list and jumps to the 'out' label, where it calls free_reloc_roots() to free all the reloc roots in the local reloc_roots list. This frees the reloc root for root X; 4) We go up the call chain to relocate_block_group() which calls clean_dirty_subvols() to go over dirty roots and set their ->reloc_root field to NULL, but root X is not in the dirty_subvol_roots list, so its ->reloc_root still points to a reloc root; 5) Relocation finishes, with an error and a transaction abort, but the ->reloc_root field for root X still points to the reloc root that was freed in step 3; 6) When unmounting the fs we end up calling: btrfs_free_fs_roots() btrfs_drop_and_free_fs_root() --> calls btrfs_put_root() against root X's ->reloc_root which is not NULL and points to the already freed reloc root in step 4 above Resulting in a use-after-free to a double free attempt. Syzbot reported this with the following dmesg/syslog: [ 106.004389][ T5339] BTRFS error (device loop0 state A): Transaction aborted

    Засегнати продукти

    • Linux Linux: f32b84d7c977e1906a4781b93b3c93090b6cd675 преди 5a247097c5f94b51ffc991b444d998ad6e85875f; 592fbcd50c99b8adf999a2a54f9245caff333139 преди 6372dd394ea907cd85a7a8063db320ec73dfaed0; 592fbcd50c99b8adf999a2a54f9245caff333139 преди 9f599d120b2b79d2d937c3935b7cdf2697514283; 592fbcd50c99b8adf999a2a54f9245caff333139 преди a01837ae174a2a968c245a30e6dd010f50eaf05d; 592fbcd50c99b8adf999a2a54f9245caff333139 преди 97a540d72ebcb21853d11f2a56782fe377f358e7; 592fbcd50c99b8adf999a2a54f9245caff333139 преди fda1b6636ff1846f00643e791099db5564b547d9; 592fbcd50c99b8adf999a2a54f9245caff333139 преди 83201804efa4a5168be754e1dfc9b2faee760cac; aa18bc1ff8a51f082d5b3b6d07693797637b4028; 4cb0aea2e250eee35ccfac5f5395cd8f3238a9e5; 5.10.36 преди 5.10.271; 5.11.20 преди 5.12; 5.12.3 преди 5.13
    • Linux Linux: 5.13; преди 5.13; 5.10.271 до 5.10.*; 5.15.222 до 5.15.*; 6.1.189 до 6.1.*; 6.6.158 до 6.6.*; 6.12.111 до 6.12.*; 6.18.53 до 6.18.*; от 7.2 нататък

    История

    • 24 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-93800: Linux | freedomonline.bg