xsk: Use a 32-bit compare in xsk_map_gen_lookup
CVSS score
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EPSS probability
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Risk score
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Published
15 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%63
Short explanation
In the Linux kernel, the xsk_map_gen_lookup function can bypass bounds checking when a 32‑bit key is sign‑extended to 64‑bit by BPF_JMP_IMM, leading to out‑of‑bounds reads of the xsk_map array (CVE‑2026‑98631).
Out‑of‑bounds reads can expose kernel memory, increasing the risk of exploitation and gaining root privileges.
What should be done?
- Monitor and apply kernel patches when released
- If patch status is unknown, follow vendor advisories
- Disable XDP sockets if not required
- Harden eBPF program loading policies
- Enable security monitoring for anomalous behavior
Chain of evidence and sources
xsk_map_gen_lookup işlevi, BPF_JMP_IMM ile 32‑bit anahtarı 64‑bit’e genişlettiğinde sınır kontrolünü atlayarak xsk_map dizisinin dışına okuma yapabiliyor (CVE‑2026‑98631).
Vulnerabilite, Linux çekirdeğinin 5.5, 5.10.271+, 5.15.222+, 6.1.189+, 6.6.158+, 6.12.112+, 6.18.55+, 7.2.9+ sürümlerinde etkilenmediği, ancak belirtilen commit hash aralıkları içinde bulunan sürümlerde etkili olduğu rapor edilmiştir.
CVE‑2026‑98631 için CISA KEV listesinde aktif istismar bulunmamaktadır ve yama durumu resmi kaynaklarda "UNKNOWN" olarak belirtilmiştir; bu, yama yok anlamına gelmez ancak mevcut bir düzeltme doğrulanmamıştır.
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: xsk: Use a 32-bit compare in xsk_map_gen_lookup xsk_map_gen_lookup() loads a u32 key and compares it with max_entries using BPF_JMP_IMM. BPF immediates are sign-extended to 64 bits, so a max_entries value of 0x80000000 or higher becomes a threshold larger than every zero-extended 32-bit key. An out-of-range index then skips the bounds check and the generated lookup reads past xsk_map[]. Compare with BPF_JMP32_IMM so the check stays in 32-bit unsigned range.
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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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-2026-98631 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-2026-98631 weaknesses.
Official Sources and Advisories
Yama durumu bilinmiyor
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