Answer in brief
CVE-2026-23417 records a Unknown severity vulnerability in bpf: Fix constant blinding for PROBE_MEM32 stores. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=6082b6c328b5486da2b356eae94b8b83c98b5565 <56af722756ed82fee2ae5d5b4d04743407506195 || >=6082b6c328b5486da2b356eae94b8b83c98b5565 <ccbf29b28b5554f9d65b2fb53b994673ad58b3bf || >=6082b6c328b5486da2b356eae94b8b83c98b5565 <de641ea08f8fff6906e169d2576c2ac54e562fbb || >=6082b6c328b5486da2b356eae94b8b83c98b5565 <2321a9596d2260310267622e0ad8fbfa6f95378f | 56af722756ed82fee2ae5d5b4d04743407506195, ccbf29b28b5554f9d65b2fb53b994673ad58b3bf, de641ea08f8fff6906e169d2576c2ac54e562fbb, 2321a9596d2260310267622e0ad8fbfa6f95378f |
| Linux/Linuxgeneric | 6.9 | Not reported |
Published upstream
Apr 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.