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CVE-2026-23417— bpf: Fix constant blinding for PROBE_MEM32 stores

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bpf未对PROBE_MEM32存储进行常量混淆，可能导致用户控制的数据进入JIT代码。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 6082b6c328b5486da2b356eae94b8b83c98b5565< 56af722756ed82fee2ae5d5b4d04743407506195 affected
6082b6c328b5486da2b356eae94b8b83c98b5565< ccbf29b28b5554f9d65b2fb53b994673ad58b3bf affected
6082b6c328b5486da2b356eae94b8b83c98b5565< de641ea08f8fff6906e169d2576c2ac54e562fbb affected
6082b6c328b5486da2b356eae94b8b83c98b5565< 2321a9596d2260310267622e0ad8fbfa6f95378f affected
6.9 affected
< 6.9 unaffected
6.12.80≤ 6.12.* unaffected
6.18.21≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-23417

Vulnerability Information
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Vulnerability Title
bpf: Fix constant blinding for PROBE_MEM32 stores
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix constant blinding for PROBE_MEM32 stores BPF_ST | BPF_PROBE_MEM32 immediate stores are not handled by bpf_jit_blind_insn(), allowing user-controlled 32-bit immediates to survive unblinded into JIT-compiled native code when bpf_jit_harden >= 1. The root cause is that convert_ctx_accesses() rewrites BPF_ST|BPF_MEM to BPF_ST|BPF_PROBE_MEM32 for arena pointer stores during verification, before bpf_jit_blind_constants() runs during JIT compilation. The blinding switch only matches BPF_ST|BPF_MEM (mode 0x60), not BPF_ST|BPF_PROBE_MEM32 (mode 0xa0). The instruction falls through unblinded. Add BPF_ST|BPF_PROBE_MEM32 cases to bpf_jit_blind_insn() alongside the existing BPF_ST|BPF_MEM cases. The blinding transformation is identical: load the blinded immediate into BPF_REG_AX via mov+xor, then convert the immediate store to a register store (BPF_STX). The rewritten STX instruction must preserve the BPF_PROBE_MEM32 mode so the architecture JIT emits the correct arena addressing (R12-based on x86-64). Cannot use the BPF_STX_MEM() macro here because it hardcodes BPF_MEM mode; construct the instruction directly instead.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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bpf未对PROBE_MEM32存储进行常量混淆，可能导致用户控制的数据进入JIT代码。
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 6082b6c328b5486da2b356eae94b8b83c98b5565 ~ 56af722756ed82fee2ae5d5b4d04743407506195 -
Linux Linux 6.9 -

II. Public POCs for CVE-2026-23417

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III. Intelligence Information for CVE-2026-23417

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

CVE-2026-23415 7.8 HIGH futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
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-2026-23416 mm/mseal: update VMA end correctly on merge

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23417

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