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().
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade rvUpgrade libperfUpgrade kernel-64k-debugUpgrade kernel-64k-modules-extraUpgrade kernel-debug-devel-matchedUpgrade kernel-devel-matchedUpgrade kernel-rt-modules-coreUpgrade kernel-rt-64k-modulesUpgrade kernel-rt-64k-debug-coreUpgrade kernel-64k-debug-modules-extraUpgrade kernel-rt-64k-debug-develUpgrade kernel-rt-64k-modules-extraUpgrade kernel-uki-virtUpgrade kernel-tools-libs-develUpgrade kernel-rt-64k-debug-modulesUpgrade kernel-rt-debug-modules-coreUpgrade kernel-debug-modulesUpgrade kernel-zfcpdump-coreUpgrade kernel-debug-modules-coreUpgrade kernel-rt-64k-modules-coreUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-abi-stablelistsUpgrade kernel-rt-debug-coreUpgrade kernel-zfcpdumpUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-zfcpdump-modulesUpgrade kernel-rt-debug-modules-extraUpgrade kernel-toolsUpgrade kernel-rt-64kUpgrade kernel-rtUpgrade kernel-64k-debug-devel-matchedUpgrade kernel-rt-modulesUpgrade kernel-uki-virt-addonsUpgrade kernel-64k-devel-matchedUpgrade kernel-debug-modules-extraUpgrade kernel-64k-coreUpgrade kernel-64k-debug-modules-coreUpgrade kernel-docUpgrade perfUpgrade kernel-rt-64k-debugUpgrade kernel-debug-develUpgrade kernel-rt-debug-develUpgrade python3-perfUpgrade kernel-debug-uki-virtUpgrade kernel-64k-modulesUpgrade kernel-debug-coreUpgrade kernel-rt-coreUpgrade kernel-rt-modules-extraUpgrade kernel-rt-develUpgrade kernel-rt-64k-develUpgrade kernel-64k-modules-coreUpgrade kernel-modules-coreUpgrade rtlaUpgrade kernel-64k-debug-modulesUpgrade kernel-modules-extraUpgrade kernelUpgrade kernel-rt-debug-modulesUpgrade kernel-64k-debug-coreUpgrade kernel-coreUpgrade kernel-rt-debugUpgrade kernel-tools-libsUpgrade kernel-rt-64k-debug-modules-coreUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-rt-64k-coreUpgrade kernel-64k-debug-develUpgrade kernel-64kUpgrade kernel-headersUpgrade kernel-modulesUpgrade kernel-cross-headersUpgrade kernel-develUpgrade kernel-debugUpgrade kernel-rt-64k-debug-modules-extraUpgrade kernel-64k-develUpgrade kernel-zfcpdump-devel | Oct 11, 2026 | Aug 6, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel6.18-tools-debuginfoUpgrade kernel6.18-tools-develUpgrade perf6.18-debuginfoUpgrade python3-perf6.18Upgrade bpftool6.18Upgrade bpftool6.18-debuginfoUpgrade perf6.18Upgrade python3-perf6.18-debuginfoUpgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.18-toolsUpgrade kernel6.18Upgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.18-develUpgrade kernel6.18-modules-extraUpgrade kernel6.18-debuginfoUpgrade kernel-livepatch-6.18.25-52.107Upgrade kernel6.18-headersUpgrade kernel6.18-modules-extra-common | Jun 9, 2026 | Apr 2, 2026 |
| Oracle_linux | — | Upgrade kernel | Oct 22, 2026 | Apr 2, 2026 |
| Redhat_linux | — | Upgrade kernelNo solution existsUpgrade kernel-rt | Jul 17, 2026 | Apr 2, 2026 |
| Rocky_linux | — | Upgrade kernel-debug-modules-extraUpgrade perf-debuginfoUpgrade kernel-zfcpdump-modulesUpgrade python3-perf-debuginfoUpgrade kernel-rt-debugUpgrade kernel-tools-libsUpgrade kernel-rt-modulesUpgrade kernel-rt-debug-debuginfoUpgrade kernel-rt-debug-modules-extraUpgrade kernel-uki-virt-addonsUpgrade kernel-rt-debug-modules-coreUpgrade kernel-develUpgrade kernel-rt-develUpgrade kernel-zfcpdump-coreUpgrade kernel-tools-libs-develUpgrade rvUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-rt-modules-coreUpgrade kernel-uki-virtUpgrade libperf-debuginfoUpgrade kernel-zfcpdumpUpgrade kernel-rtUpgrade perfUpgrade kernel-debuginfo-common-s390xUpgrade kernel-toolsUpgrade kernel-rt-debuginfoUpgrade kernel-debug-debuginfoUpgrade kernel-zfcpdump-debuginfoUpgrade kernel-coreUpgrade python3-perfUpgrade kernelUpgrade kernel-zfcpdump-develUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-debug-develUpgrade rtlaUpgrade kernel-rt-coreUpgrade libperfUpgrade kernel-debug-uki-virtUpgrade kernel-debug-coreUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-rt-modules-extraUpgrade kernel-modulesUpgrade kernel-debug-modules-coreUpgrade kernel-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-devel-matchedUpgrade kernel-debugUpgrade kernel-rt-debug-coreUpgrade kernel-modules-coreUpgrade kernel-rt-debug-modulesUpgrade kernel-modules-extraUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debug-modulesUpgrade kernel-modules-extra-matchedUpgrade kernel-debug-devel-matchedUpgrade kernel-rt-debug-devel | Aug 10, 2026 | Aug 7, 2026 |
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