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CVE-2026-31445: Linux

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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/core: avoid use of half-online-committed context One major usage of damon_call() is online DAMON parameters update. It is done by calling damon_commit_ctx() inside the damon_call() callback function. damon_commit_ctx() can fail for two reasons: 1) invalid parameters and 2) internal memory allocation failures. In case of failures, the damon_ctx that attempted to be updated (commit destination) can be partially updated (or, corrupted from a perspective), and therefore shouldn't be used anymore. The function only ensures the damon_ctx object can safely deallocated using damon_destroy_ctx(). The API callers are, however, calling damon_commit_ctx() only after asserting the parameters are valid, to avoid damon_commit_ctx() fails due to invalid input parameters. But it can still theoretically fail if the internal memory allocation fails. In the case, DAMON may run with the partially updated damon_ctx. This can result in unexpected behaviors including even NULL pointer dereference in case of damos_commit_dests() failure [1]. Such allocation failure is arguably too small to fail, so the real world impact would be rare. But, given the bad consequence, this needs to be fixed. Avoid such partially-committed (maybe-corrupted) damon_ctx use by saving the damon_commit_ctx() failure on the damon_ctx object. For this, introduce damon_ctx->maybe_corrupted field. damon_commit_ctx() sets it when it is failed. kdamond_call() checks if the field is set after each damon_call_control->fn() is executed. If it is set, ignore remaining callback requests and return. All kdamond_call() callers including kdamond_fn() also check the maybe_corrupted field right after kdamond_call() invocations. If the field is set, break the kdamond_fn() main loop so that DAMON sill doesn't use the context that might be corrupted. [[email protected]: let kdamond_call() with cancel regardless of maybe_corrupted]

    Засегнати продукти

    • Linux Linux: 3301f1861d34f53911a30a8f5f41b9141bd8ed39 преди 9c495f9d3781cd692bd199531cabd4627155e8cd; 3301f1861d34f53911a30a8f5f41b9141bd8ed39 преди 1b247cd0654a3a306996fa80741d79296c683a56; 3301f1861d34f53911a30a8f5f41b9141bd8ed39 преди 26f775a054c3cda86ad465a64141894a90a9e145
    • Linux Linux: 6.15; преди 6.15; 6.18.21 до 6.18.*; 6.19.11 до 6.19.*; от 7.0 нататък

    История

    • 22 април 2026 Публикувано

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    CVE-2026-31445: Linux | freedomonline.bg