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CVE-2026-90303

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 5.15.221, <c71f9a56520b419e55d173052629f2324deb5549, <2a14d7797a49a47bccd1a9327fd69da838dcb0dd, 0, 5.10.270, 6.1.188, 6.18.52, <720408d98d9fb3c91a12090436734c8c61f04545, <4.0, <=5.10.*, <=6.6.*, 4.0, 6.6.157, <ab14f07952adfe735d86a53518f8cd576dfd5892, 7.2.6, <=6.18.*, <1039bffd6ae9c75b42b7d148d6c1106134107b66, 6.12.110, <=7.2.*, <59bbf86d0ff9373bfa033ca123c1e924f09f1eba, <07e4d5380f2a844ab7a1b440dde350caf561cbb0, <=*, <=5.15.*, <63e3c958a602d0896a101a897c2361878c266ca7, 6d021b724481fbb908eb29384898deb9f00dfe70, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults When CONFIG_DEBUG_USER=y, and cmdline "user_debug=31" is set, a user fault may trigger show_pte() without any lock. If another thread in the same process concurrently calls munmap(), the page table pages may be freed while show_pte() is still traversing them, causing a use-after-free in show_pte(). If CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table of PMD are freed when show_pte() is running. Acquire mmap_write_lock() around show_pte() for user faults to fix the contention. For user faults, additionally restrict that show_pte() is called only when the addr is a user-space address (addr < TASK_SIZE). This is because the lock of tsk->mm only protects the virtual memory of user address space, furthermore, dumping the page tables of a kernel-space address for user faults is unnecessary and may have security implications. Keep everything unchanged for kernel faults, because the kernel is already in the "oops" state, acquiring a lock may risk a deadlock.

Gravité et risque d'exploitation

CVE-2026-90303 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 0.22 %, ce qui la place devant 11.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 5.15.221, <c71f9a56520b419e55d173052629f2324deb5549, <2a14d7797a49a47bccd1a9327fd69da838dcb0dd, 0, 5.10.270, 6.1.188, 6.18.52, <720408d98d9fb3c91a12090436734c8c61f04545, <4.0, <=5.10.*, <=6.6.*, 4.0, 6.6.157, <ab14f07952adfe735d86a53518f8cd576dfd5892, 7.2.6, <=6.18.*, <1039bffd6ae9c75b42b7d148d6c1106134107b66, 6.12.110, <=7.2.*, <59bbf86d0ff9373bfa033ca123c1e924f09f1eba, <07e4d5380f2a844ab7a1b440dde350caf561cbb0, <=*, <=5.15.*, <63e3c958a602d0896a101a897c2361878c266ca7, 6d021b724481fbb908eb29384898deb9f00dfe70, 7.3) 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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