The guest_walk_tables function in arch/x86/mm/guest_walk.c in Xen 4.6.x and earlier does not properly handle the Page Size (PS) page table entry bit at the L4 and L3 page table levels, which might allow local guest OS users to gain privileges via a crafted mapping of memory.
結論預警: CVE-2016-4480 綜合評估為中等風險(48.2/100):CVSS 技術影響為高級,利用機率偏低(EPSS 0.55%) 強制指令: 梳理受影響資產並納入修補計畫。
風險隨態勢動態變化;本站持續評估並同步更新本頁展示內容。
EPSS 日更估計相對被利用可能性;百分位表示該 CVE 在已評分漏洞中的相對排名(越高表示相對更嚴重)。
| # | 日期 | 舊 EPSS 分數 | 新 EPSS 分數 | 變化(新 − 舊) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.40% | 0.55% | +0.14% |
| 2 | 2026-02-18 | 0.52% | 0.40% | -0.11% |
| 3 | 2025-12-03 | — | 0.52% | — |
完整 EPSS 歷史 (共 13 筆)
該 CVE 的 CVSS 指標。
| 底座分 | 版本 | 嚴重度 | 向量 | 可利用性 | 影響 | 分數來源 |
|---|---|---|---|---|---|---|
| 8.4 | 3.0 | HIGH |
|
2.5 | 5.9 | [email protected] |
| 7.2 | 2.0 | HIGH |
|
3.9 | 10.0 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2016-4480 not yet assigned priority: Debian including 1 source packages (xen), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2016-4480 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2016-4480 |
ubuntu
|
low | CVE-2016-4480 low priority: Ubuntu including 24 source packages (linux, linux-armadaxp, …), 120 status rows across 5 suites (precise, trusty, upstream, wily, xenial): DNE 70, not-affected 38, ignored 7, released 4, needs-triage 1. | https://ubuntu.com/security/CVE-2016-4480 |