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CVE-2026-46086: 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: net: bridge: use a stable FDB dst snapshot in RCU readers Local FDB entries can be rewritten in place by `fdb_delete_local()`, which updates `f->dst` to another port or to `NULL` while keeping the entry alive. Several bridge RCU readers inspect `f->dst`, including `br_fdb_fillbuf()` through the `brforward_read()` sysfs path. These readers currently load `f->dst` multiple times and can therefore observe inconsistent values across the check and later dereference. In `br_fdb_fillbuf()`, this means a concurrent local-FDB update can change `f->dst` after the NULL check and before the `port_no` dereference, leading to a NULL-ptr-deref. Fix this by taking a single `READ_ONCE()` snapshot of `f->dst` in each affected RCU reader and using that snapshot for the rest of the access sequence. Also publish the in-place `f->dst` updates in `fdb_delete_local()` with `WRITE_ONCE()` so the readers and writer use matching access patterns.

    Засегнати продукти

    • Linux Linux: 960b589f86c74ce582922fcb996103271081f4de преди c502fa9f094cb03d1d1685c71e2105ab359bc2b8; 960b589f86c74ce582922fcb996103271081f4de преди a6ae4511c07b91f597e461406c6330f0d4ff810e; 960b589f86c74ce582922fcb996103271081f4de преди 1406c4e0ed1eaf8a29801ab1163d00fb7ee4359a; 960b589f86c74ce582922fcb996103271081f4de преди 0b9e4bbfb7c949151e3acd44ed4aa33614d2e110; 960b589f86c74ce582922fcb996103271081f4de преди 81af4137a30c4c2dc694dea8cacb180bd66000ef; 960b589f86c74ce582922fcb996103271081f4de преди 5424e678f9b304e148cf5dcc047cffc7a56a3bb5; 960b589f86c74ce582922fcb996103271081f4de преди 9a2d9d4e657b23dc21f24cf139e3aeff0b61341f; 960b589f86c74ce582922fcb996103271081f4de преди df4601653201de21b487c3e7fffd464790cab808
    • Linux Linux: 3.14; преди 3.14; 5.10.259 до 5.10.*; 5.15.210 до 5.15.*; 6.1.176 до 6.1.*; 6.6.140 до 6.6.*; 6.12.86 до 6.12.*; 6.18.27 до 6.18.*; 7.0.4 до 7.0.*; 7.1 до *
    • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *
    • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: V3.1.6 преди *
    • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: преди *
    • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *

    История

    • 27 май 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-46086: Linux | freedomonline.bg