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CVE-2026-90954— Busybox: busybox: dpkg-deb extraction-root escape via per-ar-member deferred symlink flush

一分钟漏洞结论

影响对象
Red Hat Red Hat Hardened Images
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

A flaw was found in BusyBox's dpkg-deb archive extraction. The ar archive handler flushes deferred symlinks after each archive member, unlike the tar, cpio, and unzip handlers which flush once after the last member. A specially crafted .deb archive with two da

CVSS 7.8 · High
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一、 漏洞 CVE-2026-90954 基础信息

漏洞信息

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Vulnerability Title
Busybox: busybox: dpkg-deb extraction-root escape via per-ar-member deferred symlink flush
来源: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in BusyBox's dpkg-deb archive extraction. The ar archive handler flushes deferred symlinks after each archive member, unlike the tar, cpio, and unzip handlers which flush once after the last member. A specially crafted .deb archive with two data.tar members can exploit this ordering: the first member declares a symlink pointing to an absolute path (e.g., '/'), which is deferred as unsafe but flushed after the first member. The second member declares a regular file whose path traverses the now-live symlink, resulting in a file being written outside the intended extraction directory. This could allow an attacker to write arbitrary files to arbitrary locations when a user extracts a crafted .deb package.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1

二、漏洞 CVE-2026-90954 的公开POC

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三、漏洞 CVE-2026-90954 的情报信息

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CVE-2026-90954 其他参考 (2)

同批安全公告 · Red Hat · 2026-10-14 · 共 10 条

CVE-2026-104795 8.8 HIGH Insights-runtime-extractor: insights-runtime-extractor: container escape via privileged bi
CVE-2026-86476 8.4 HIGH Gstreamer1-plugins-base: gst-plugins-base: heap buffer overflow via unvalidated gstvideome
CVE-2026-88829 7.2 HIGH Busybox: busybox: http request smuggling via pipelined requests in httpd reverse proxy
CVE-2026-100229 6.5 MEDIUM Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad-free: out-of-bounds write in gst_h266_
CVE-2026-100231 6.1 MEDIUM Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad-free: heap out-of-bounds write in asfm
CVE-2026-109971 4.7 MEDIUM Clevis: clevis: pkcs#11 token pin exposed on command line via pkcs11-tool
CVE-2026-109970 4.7 MEDIUM Clevis: clevis: pkcs#11 token pin written to world-readable file
CVE-2026-109969 4.7 MEDIUM Clevis: clevis: no authentication on pkcs#11 af_unix sockets allows key injection under pe
CVE-2026-88842 3.3 LOW Busybox: busybox: dpkg stale field_start pointer causes out-of-bounds read and status file

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat
Same weakness: CWE-59

V. Comments for CVE-2026-90954

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