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CVE-2026-31787: Linux

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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: xen/privcmd: fix double free via VMA splitting privcmd_vm_ops defines .close (privcmd_close), but neither .may_split nor .open. When userspace does a partial munmap() on a privcmd mapping, the kernel splits the VMA via __split_vma(). Since may_split is NULL, the split is allowed. vm_area_dup() copies vm_private_data (a pages array allocated in alloc_empty_pages()) into the new VMA without any fixup, because there is no .open callback. Both VMAs now point to the same pages array. When the unmapped portion is closed, privcmd_close() calls: - xen_unmap_domain_gfn_range() - xen_free_unpopulated_pages() - kvfree(pages) The surviving VMA still holds the dangling pointer. When it is later destroyed, the same sequence runs again, which leads to a double free. Fix this issue by adding a .may_split callback denying the VMA split. This is XSA-487 / CVE-2026-31787

    Засегнати продукти

    • Linux Linux: d71f513985c22f1050295d1a7e4327cf9fb060da преди dbf862ce9f009128ab86b234d91413a3e450beb4; d71f513985c22f1050295d1a7e4327cf9fb060da преди 2b985d3a024b9e8c24e21671b34e855569763808; d71f513985c22f1050295d1a7e4327cf9fb060da преди 1576ff3869cbd3620717195f971c85b7d7fd62b5; d71f513985c22f1050295d1a7e4327cf9fb060da преди 402d84ad9e89bd4cbfd07ca8598532b7021daf95; d71f513985c22f1050295d1a7e4327cf9fb060da преди 2894a351fe2ea8684919d36df3188b9a35e3926f; d71f513985c22f1050295d1a7e4327cf9fb060da преди 446ee446d9ae66f36e95c3c90bbcc4e56b94cde0; d71f513985c22f1050295d1a7e4327cf9fb060da преди 71bf829800758a6e3889096e4754ef47ba7fc850; d71f513985c22f1050295d1a7e4327cf9fb060da преди 24daca4fc07f3ff8cd0e3f629cd982187f48436a
    • Linux Linux: 3.8; преди 3.8; 5.10.254 до 5.10.*; 5.15.204 до 5.15.*; 6.1.170 до 6.1.*; 6.6.137 до 6.6.*; 6.12.85 до 6.12.*; 6.18.26 до 6.18.*; 7.0.3 до 7.0.*; от 7.1 нататък

    История

    • 30 април 2026 Публикувано

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    CVE-2026-31787: Linux | freedomonline.bg