perf: Require kernel access for text poke events
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EPSS probability
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Risk score
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Published
21 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%63
Short explanation
The perf subsystem in the Linux kernel fails to suppress text-poke sideband records despite the exclude_kernel=1 setting, leading to the leakage of the runtime kernel text base address and bypassing KASLR.
It allows an unprivileged task to observe raw kernel instruction addresses and weakens the effectiveness of KASLR protections.
What should be done?
- Calling perf_allow_kernel() whenever attr.text_poke is set
- Following vendor advisories for updates
Chain of evidence and sources
exclude_kernel=1 ayarına rağmen text-poke yan kanal kayıtları engellenmez.
Her PERF_RECORD_TEXT_POKE kaydı ham çekirdek komut adresi içerir.
Bu durum, KASLR korumasına rağmen çalışma zamanı çekirdek metin taban adresini açığa çıkarır.
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: perf: Require kernel access for text poke events Perf events with exclude_kernel=1 can be opened without kernel perf access. However, exclude_kernel does not suppress text-poke sideband records. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL and contains a raw kernel instruction address. An unprivileged task can therefore open and mmap a task-local software event with text_poke=1. Both opening a count-only tracepoint event and configuring UDP GRO for ESP-in-UDP cause updates to inline static calls; the observer receives the relocated addresses of the modified instructions. For a known kernel image, any such address reveals the runtime kernel text base despite KASLR. Call perf_allow_kernel() whenever attr.text_poke is set, regardless of exclude_kernel. Events that neither monitor kernel execution nor request text-poke records retain their existing permissions.
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
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SCORING: CVSS from Multiple Sources
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Patch and Remediation Guide
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98655 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98655 weaknesses.
Official Sources and Advisories
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