CVE-2026-45837
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
W jądrze Linux wykryto podatność use-after-free w mechanizmie BPF arena podczas wywoływania funkcji fork. Problem wynika z nieprawidłowego dziedziczenia VMA (Virtual Memory Area) przez proces potomny, co prowadzi do użycia wygasłego wskaźnika i potencjalnej eskalacji uprawnień.
Risk Assessment
Atakujący może wykorzystać tę podatność do uzyskania nieautoryzowanego dostępu do pamięci jądra, co może prowadzić do eskalacji uprawnień lub wycieku wrażliwych danych.
Recommendation
Zaleca się natychmiastową aktualizację jądra Linux do wersji zawierającej poprawkę (z flagą VM_DONTCOPY i odpowiednimi callbackami). Należy monitorować dostępność łatki dla używanej dystrybucji.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix use-after-free in arena_vm_close on fork arena_vm_open() only bumps vml->mmap_count but never registers the child VMA in arena->vma_list. The vml->vma always points at the parent VMA, so after parent munmap the pointer dangles. If the child then calls bpf_arena_free_pages(), zap_pages() reads the stale vml->vma triggering use-after-free. Fix this by preventing the arena VMA from being inherited across fork with VM_DONTCOPY, and preventing VMA splits via the may_split callback. Also reject mremap with a .mremap callback returning -EINVAL. A same-size mremap(MREMAP_FIXED) on the full arena VMA reaches copy_vma() through the following path: check_prep_vma() - returns 0 early: new_len == old_len skips VM_DONTEXPAND check prep_move_vma() - vm_start == old_addr and vm_end == old_addr + old_len so may_split is never called move_vma() copy_vma_and_data() copy_vma() vm_area_dup() - copies vm_private_data (vml pointer) vm_ops->open() - bumps vml->mmap_count vm_ops->mremap() - returns -EINVAL, rollback unmaps new VMA The refcount ensures the rollback's arena_vm_close does not free the vml shared with the original VMA.

