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CVE-2025-38102

VMCI: fix race between vmci_host_setup_notify and vmci_ctx_unset_notify

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.296, 5.10.240, 5.15.186, 6.1.142, 6.6.94, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: VMCI: fix race between vmci_host_setup_notify and vmci_ctx_unset_notify During our test, it is found that a warning can be trigger in try_grab_folio as 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: <TASK> 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_fast and can be seen in vmci_ctx_unset_notify which will try to put_page. However get_user_pages_fast is not finished here and lead to following try_grab_folio warning. The race condition is shown as follow: cpu0 cpu1 vmci_host_do_set_notify vmci_host_setup_notify get_user_pages_fast(uva, 1, FOLL_WRITE, &context->notify_page); lockless_pages_from_mm gup_pgd_range gup_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_pages follow_trans_huge_pmd try_grab_folio // warn here To slove this, use local variable page to make notify_page can be seen after finish get_user_pages_fast.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From a1d88436d53a75e950db15834b3d2f8c0c358fdc · fixed in 74095bbbb19ca74a0368d857603a2438c88ca86c; From a1d88436d53a75e950db15834b3d2f8c0c358fdc · fixed in 468aec888f838ce5174b96e0cb4396790d6f60ca; From a1d88436d53a75e950db15834b3d2f8c0c358fdc · fixed in b4209e4b778e4e57d0636e1c9fc07a924dbc6043; From a1d88436d53a75e950db15834b3d2f8c0c358fdc · fixed in 58a90db70aa6616411e5f69d1982d9b1dd97d774; From a1d88436d53a75e950db15834b3d2f8c0c358fdc · fixed in 6e3af836805ed1d7a699f76ec798626198917aa4; From a1d88436d53a75e950db15834b3d2f8c0c358fdc · fixed in 00ddc7dad55b7bbb78df80d6e174d0c4764dea0c; From a1d88436d53a75e950db15834b3d2f8c0c358fdc · fixed in 75b5313c80c39a26d27cbb602f968a05576c36f9; From a1d88436d53a75e950db15834b3d2f8c0c358fdc · fixed in 1bd6406fb5f36c2bb1e96e27d4c3e9f4d09edde4

  • Linux Linux

    4.0

  • KernelLinux

    From 4.0.0 · fixed in 5.4.296; From 5.5.0 · fixed in 5.10.240; From 5.11.0 · fixed in 5.15.186; From 5.16.0 · fixed in 6.1.142; From 6.2.0 · fixed in 6.6.94; From 6.7.0 · fixed in 6.12.34; From 6.13.0 · fixed in 6.15.3

References 8

git.kernel.org