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CVE-2025-38102

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 6.6.94, <58a90db70aa6616411e5f69d1982d9b1dd97d774, 0, 6.12.34, <=6.15.*, a1d88436d53a75e950db15834b3d2f8c0c358fdc, <4.0, <75b5313c80c39a26d27cbb602f968a05576c36f9, 5.15.186, <=5.10.*, <=6.6.*, 4.0, 5.10.240, 5.4.296, <00ddc7dad55b7bbb78df80d6e174d0c4764dea0c, 6.1.142, <=5.4.*, 6.16, <1bd6406fb5f36c2bb1e96e27d4c3e9f4d09edde4, <468aec888f838ce5174b96e0cb4396790d6f60ca, <b4209e4b778e4e57d0636e1c9fc07a924dbc6043, <6e3af836805ed1d7a699f76ec798626198917aa4, 6.15.3, <=*, <=5.15.*, <74095bbbb19ca74a0368d857603a2438c88ca86c

Description

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.

Gravité et risque d'exploitation

CVE-2025-38102 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.16 %, ce qui la place devant 4.4 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 6.6.94, <58a90db70aa6616411e5f69d1982d9b1dd97d774, 0, 6.12.34, <=6.15.*, a1d88436d53a75e950db15834b3d2f8c0c358fdc, <4.0, <75b5313c80c39a26d27cbb602f968a05576c36f9, 5.15.186, <=5.10.*, <=6.6.*, 4.0, 5.10.240, 5.4.296, <00ddc7dad55b7bbb78df80d6e174d0c4764dea0c, 6.1.142, <=5.4.*, 6.16, <1bd6406fb5f36c2bb1e96e27d4c3e9f4d09edde4, <468aec888f838ce5174b96e0cb4396790d6f60ca, <b4209e4b778e4e57d0636e1c9fc07a924dbc6043, <6e3af836805ed1d7a699f76ec798626198917aa4, 6.15.3, <=*, <=5.15.*, <74095bbbb19ca74a0368d857603a2438c88ca86c) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

Rechercher une autre CVE