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.
结论预警: CVE-2016-4480 综合评估为中等风险(48.2/100):CVSS 技术影响为高级,利用概率偏低(EPSS 0.55%) 强制指令: 梳理受影响资产并纳入修补计划。
风险随态势动态变化;本站持续评估并同步更新本页展示内容。
EPSS 日更估计相对被利用可能性;百分位表示该 CVE 在已评分漏洞中的相对排名(越高表示相对更严重)。
| # | 日期 | 旧 EPSS 分数 | 新 EPSS 分数 | 变化(新 − 旧) |
|---|---|---|---|---|
| 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 历史 (共 13 条)
该 CVE 的 CVSS 指标。
| 底座分 | 版本 | 严重度 | 向量 | 可利用性 | 影响 | 分数来源 |
|---|---|---|---|---|---|---|
| 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 |