CVE-2026-23415
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
W jądrze systemu Linux zidentyfikowano podatność związana z użyciem po zwolnieniu (use-after-free) w funkcji __futex_key_to_node(). Problem występuje, gdy podczas wykonywania futex_key_to_node_opt() odczytywana jest polityka pamięci, a równocześnie inna funkcja mbind() może zwolnić starą politykę pamięci, co prowadzi do dereferencji wskaźnika zwolnionej polityki.
Risk Assessment
Podatność ta może prowadzić do nieprzewidywalnych zachowań systemu, w tym do awarii aplikacji lub potencjalnego przejęcia kontroli nad systemem przez atakującego. W szczególności, wykorzystanie tej luki może skutkować naruszeniem integralności danych.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, w której ta podatność została naprawiona. Dodatkowo, monitorowanie logów systemowych w celu wykrycia potencjalnych prób wykorzystania tej luki jest wskazane.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy() During futex_key_to_node_opt() execution, vma->vm_policy is read under speculative mmap lock and RCU. Concurrently, mbind() may call vma_replace_policy() which frees the old mempolicy immediately via kmem_cache_free(). This creates a race where __futex_key_to_node() dereferences a freed mempolicy pointer, causing a use-after-free read of mpol->mode. [ 151.412631] BUG: KASAN: slab-use-after-free in __futex_key_to_node (kernel/futex/core.c:349) [ 151.414046] Read of size 2 at addr ffff888001c49634 by task e/87 [ 151.415969] Call Trace: [ 151.416732] __asan_load2 (mm/kasan/generic.c:271) [ 151.416777] __futex_key_to_node (kernel/futex/core.c:349) [ 151.416822] get_futex_key (kernel/futex/core.c:374 kernel/futex/core.c:386 kernel/futex/core.c:593) Fix by adding rcu to __mpol_put().
Vulnerability data from NVD (NIST) · CISA KEV · EPSS