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CVE-2026-31652: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: mm/damon/stat: deallocate damon_call() failure leaking damon_ctx damon_stat_start() always allocates the module's damon_ctx object (damon_stat_context). Meanwhile, if damon_call() in the function fails, the damon_ctx object is not deallocated. Hence, if the damon_call() is failed, and the user writes Y to “enabled” again, the previously allocated damon_ctx object is leaked. This cannot simply be fixed by deallocating the damon_ctx object when damon_call() fails. That's because damon_call() failure doesn't guarantee the kdamond main function, which accesses the damon_ctx object, is completely finished. In other words, if damon_stat_start() deallocates the damon_ctx object after damon_call() failure, the not-yet-terminated kdamond could access the freed memory (use-after-free). Fix the leak while avoiding the use-after-free by keeping returning damon_stat_start() without deallocating the damon_ctx object after damon_call() failure, but deallocating it when the function is invoked again and the kdamond is completely terminated. If the kdamond is not yet terminated, simply return -EAGAIN, as the kdamond will soon be terminated. The issue was discovered [1] by sashiko.

    Засегнати продукти

    • Linux Linux: 405f61996d9d2e9d497cd9f6b66f41dc28d3d1d8 преди 447f8870b484f6596d7a7130e72bd0a3f1e037bb; 405f61996d9d2e9d497cd9f6b66f41dc28d3d1d8 преди 16c92e9bf55fa049ddb5e894dc0623dacd46a620; 405f61996d9d2e9d497cd9f6b66f41dc28d3d1d8 преди 4c04c6b47c361612b1d70cec8f7a60b1482d1400
    • Linux Linux: 6.17; преди 6.17; 6.18.23 до 6.18.*; 6.19.13 до 6.19.*; от 7.0 нататък

    История

    • 24 април 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-31652: Linux | freedomonline.bg