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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于futex_key_to_node_opt和vma_replace_policy之间存在竞争条件，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux c042c505210dc3453f378df432c10fff3d471bc5< 853f70c67d1b37e368fdcb3e328c4b8c04f53ac0 affected
c042c505210dc3453f378df432c10fff3d471bc5< 7e196194ea27bd49adf3551e2aceb83498eb73fe affected
c042c505210dc3453f378df432c10fff3d471bc5< 190a8c48ff623c3d67cb295b4536a660db2012aa affected
6.16 affected
< 6.16 unaffected
6.18.21≤ 6.18.* unaffected
6.19.11≤ 6.19.* unaffected
7.0≤ * unaffected
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I. Basic Information for CVE-2026-23415

Vulnerability Information
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Vulnerability Title
futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
Source: CVE Program / CVE List V5
Vulnerability 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().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于futex_key_to_node_opt和vma_replace_policy之间存在竞争条件，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux c042c505210dc3453f378df432c10fff3d471bc5 ~ 853f70c67d1b37e368fdcb3e328c4b8c04f53ac0 -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-23415

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III. Intelligence Information for CVE-2026-23415

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Same Patch Batch · Linux · 2026-04-02 · 6 CVEs total

CVE-2026-23413 7.8 HIGH clsact: Fix use-after-free in init/destroy rollback asymmetry
CVE-2026-23412 7.8 HIGH netfilter: bpf: defer hook memory release until rcu readers are done
CVE-2026-23414 7.5 HIGH tls: Purge async_hold in tls_decrypt_async_wait()
CVE-2026-23417 bpf: Fix constant blinding for PROBE_MEM32 stores
CVE-2026-23416 mm/mseal: update VMA end correctly on merge

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23415

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