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CVE-2026-68428

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <52f2f7c30126037975389aa04d24c506a5177c35, 6.12.101, 0, <=7.1.*, 5.15.216, <43cfb20d62ffe49626d62beecfc32eb6f262191c, <32b9f89ed9e6d7a45075d64089c254a7f6e13695, <=5.10.*, <=6.6.*, <6f4be73880302d5642c83a0813fdfe1f5fd4b6e3, 6.18.42, <42272b0f239f3a89f9c26a01cc37aee06138b1b7, 7.1.6, 6.1.183, <=6.18.*, <ec9daa8fd1b6f45545c9839dca55bd867fad9e13, 2.6.25, <940950d5cd86f250dca578279ad5ca63b4e0986b, <2.6.25, cb498ea2ce1d3f3c0bc0a2522241dca10263e437, <034b7fa1f5846d69eb51f12ce6d1c71871e83c2d, <=*, <=5.15.*, 5.10.265, 6.6.148, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Fix use-after-free on vendor module reload mmu_destroy_caches() destroys pte_list_desc_cache and mmu_page_header_cache, but leaves both pointers unchanged. The pointers live in kvm.ko, and therefore survive when a vendor module is unloaded while kvm.ko remains loaded. If creation of pte_list_desc_cache fails during a subsequent vendor module load, its assignment sets pte_list_desc_cache to NULL and the error path calls mmu_destroy_caches(). mmu_page_header_cache still points to the cache destroyed during the preceding vendor module unload. Passing that stale pointer to kmem_cache_destroy() causes a slab use-after-free. Reproduce the issue on a v7.1.3 kernel with CONFIG_KASAN=y, CONFIG_KASAN_GENERIC=y, CONFIG_KVM=m, and CONFIG_KVM_INTEL=m. A one-shot test hook forces pte_list_desc_cache to NULL on the second invocation of kvm_mmu_vendor_module_init(): 1. Load kvm.ko and kvm-intel.ko, creating both caches. 2. Unload only kvm_intel, leaving kvm.ko loaded. 3. Reload kvm_intel and force initialization through the -ENOMEM path. KASAN reports: BUG: KASAN: slab-use-after-free in kvm_mmu_vendor_module_init+0x5b/0x170 [kvm] ... kmem_cache_destroy+0x21/0x1d0 kvm_mmu_vendor_module_init+0x5b/0x170 [kvm] ... Allocated by task 16817: __kmem_cache_create_args+0x12c/0x3b0 __kmem_cache_create.constprop.0+0xb6/0xf0 [kvm] kvm_mmu_vendor_module_init+0x13b/0x170 [kvm] ... Freed by task 16820: kmem_cache_destroy+0x117/0x1d0 kvm_mmu_vendor_module_exit+0x21/0x30 [kvm] Clear both pointers immediately after destroying their caches so that the stored state reflects the caches' lifetime and repeated cleanup is safe. With the fix applied, the same injected vendor module reload fails with -ENOMEM as expected and produces no KASAN report.

Gravité et risque d'exploitation

CVE-2026-68428 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.17 %, ce qui la place devant 5.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <52f2f7c30126037975389aa04d24c506a5177c35, 6.12.101, 0, <=7.1.*, 5.15.216, <43cfb20d62ffe49626d62beecfc32eb6f262191c, <32b9f89ed9e6d7a45075d64089c254a7f6e13695, <=5.10.*, <=6.6.*, <6f4be73880302d5642c83a0813fdfe1f5fd4b6e3, 6.18.42, <42272b0f239f3a89f9c26a01cc37aee06138b1b7, 7.1.6, 6.1.183, <=6.18.*, <ec9daa8fd1b6f45545c9839dca55bd867fad9e13, 2.6.25, <940950d5cd86f250dca578279ad5ca63b4e0986b, <2.6.25, cb498ea2ce1d3f3c0bc0a2522241dca10263e437, <034b7fa1f5846d69eb51f12ce6d1c71871e83c2d, <=*, <=5.15.*, 5.10.265, 6.6.148, 7.2) 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

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