CVE-2026-23415 - futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()

CVE-2026-23415 - futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()

https://cvefeed.io/rssfeed/latest.atom / Thu, 04/02/2026 - 15:09
CVE ID :CVE-2026-23415
Published : April 2, 2026, 12:16 p.m. | 50 minutes ago
Description :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().
Severity: 0.0 | NA
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