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CVE-2025-38102

Description

In the Linux kernel, the following vulnerability has been resolved:VMCI: fix race between vmci_host_setup_notify and vmci_ctx_unset_notifyDuring our test, it is found that a warning can be trigger in try_grab_folioas follow: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1678 at mm/gup.c:147 try_grab_folio+0x106/0x130 Modules linked in: CPU: 0 UID: 0 PID: 1678 Comm: syz.3.31 Not tainted 6.15.0-rc5 #163 PREEMPT(undef) RIP: 0010:try_grab_folio+0x106/0x130 Call Trace: follow_huge_pmd+0x240/0x8e0 follow_pmd_mask.constprop.0.isra.0+0x40b/0x5c0 follow_pud_mask.constprop.0.isra.0+0x14a/0x170 follow_page_mask+0x1c2/0x1f0 __get_user_pages+0x176/0x950 __gup_longterm_locked+0x15b/0x1060 ? gup_fast+0x120/0x1f0 gup_fast_fallback+0x17e/0x230 get_user_pages_fast+0x5f/0x80 vmci_host_unlocked_ioctl+0x21c/0xf80 RIP: 0033:0x54d2cd ---[ end trace 0000000000000000 ]---Digging into the source, context->notify_page may init by get_user_pages_fastand can be seen in vmci_ctx_unset_notify which will try to put_page. Howeverget_user_pages_fast is not finished here and lead to followingtry_grab_folio warning. The race condition is shown as follow:cpu0 cpu1vmci_host_do_set_notifyvmci_host_setup_notifyget_user_pages_fast(uva, 1, FOLL_WRITE, &context->notify_page);lockless_pages_from_mmgup_pgd_rangegup_huge_pmd // update &context->notify_page vmci_host_do_set_notify vmci_ctx_unset_notify notify_page = context->notify_page; if (notify_page) put_page(notify_page); // page is freed__gup_longterm_locked__get_user_pagesfollow_trans_huge_pmdtry_grab_folio // warn hereTo slove this, use local variable page to make notify_page can be seenafter finish get_user_pages_fast.

CVE-2025-38102

Description

POC

Reference

Github