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CVE-2026-89495: Linux

9.8

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 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: ocfs2: bound namelen in dlm_migrate_request_handler Patch series "ocfs2/dlm: bound peer-controlled lengths in the o2dlm". The o2dlm receive handlers trust u8 length and count fields from the wire without bounding them, so a node in a DLM domain can corrupt or panic any other node with a malformed message. Three defects: - dlm_migrate_request_handler() passes migrate->namelen unchecked to dlm_init_mle(), which memcpy()s it into the 32-byte mname[] of an o2dlm_mle slab object: a heap out-of-bounds write of up to ~215 attacker-controlled bytes. - dlm_mig_lockres_handler() passes mres->lockname_len unchecked to dlm_init_lockres(), which memcpy()s it into the 32-byte o2dlm_lockname slab object: a heap out-of-bounds write of up to ~223 bytes. - the same handler trusts mres->num_locks without checking that the message is large enough to hold that many entries, so dlm_process_recovery_data() walks mres->ml[] past the kmalloc(data_len) copy and trips a BUG_ON (an out-of-bounds read ending in a panic). The other o2dlm receive handlers already reject an oversized name; the migration and recovery handlers have omitted it since the DLM was added (see the Fixes tags). Patch 1 bounds namelen; patch 2 validates lockname_len, num_locks, and the payload size. Conforming recovery and migration traffic is unaffected. o2net authenticates peers only by the DLM domain key, so any node that has joined the domain -- including a compromised or malicious member -- can send these messages. There is no local trigger; the attacker must already be a member of the cluster. Each sink was confirmed under KASAN with an out-of-tree module mirroring it exactly -- a kmem_cache/kmalloc of the real destination size, then the same unclamped memcpy/loop: slab-out-of-bounds Write for the two writes, Read for the recovery walk, and a panic. A userspace AddressSanitizer build faults identical

    Засегнати продукти

    • Linux Linux: 6714d8e86bf443f6f7af50f9d432025649f091f5 преди e1288865b8ceac0dcd1009ecba43de961f13d5bd; 6714d8e86bf443f6f7af50f9d432025649f091f5 преди aabc5d8388e6f8826345f0073455dbcaaaa6491d; 6714d8e86bf443f6f7af50f9d432025649f091f5 преди 006c96ea488eca2ef5155ec76038e0a4dbf65f0a; 6714d8e86bf443f6f7af50f9d432025649f091f5 преди 24989909d3413b44b104102caa6661b1e424ba0f; 6714d8e86bf443f6f7af50f9d432025649f091f5 преди f8658ee3327f73bd81c0bcd07cdeb5a8527fac98; 6714d8e86bf443f6f7af50f9d432025649f091f5 преди de10cd3b062a5235af754925fcf49beb5a1109d4; 6714d8e86bf443f6f7af50f9d432025649f091f5 преди 2487bea2098322669f0563baff53e797486b823f; 6714d8e86bf443f6f7af50f9d432025649f091f5 преди ea5b5609305a8437bc955a0834a530c12246d78f
    • Linux Linux: 2.6.16; преди 2.6.16; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

    История

    • 11 септември 2026 Публикувано

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