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QSN-8704-1: GNU cpio vulnerabilities
August 31, 2026
Summary
Several security issues were fixed in GNU cpio.
Details
It was discovered that cpio incorrectly sanitized hard-link targets when extracting tar archives in copy-in mode. If a user or automated system were tricked into extracting a specially crafted tar archive, an attacker could possibly use this issue to create hard links to files outside the extraction directory, even when using the --no-absolute-filenames option. (CVE-2026-66484)
It was discovered that cpio did not properly bound the stack memory allocated for pathnames during archive extraction. If a user or automated system were tricked into extracting a specially crafted cpio archive, an attacker could possibly use this issue to cause cpio to crash, resulting in a denial of service. (CVE-2026-66485)
It was discovered that cpio did not properly escape archive member names when listing archive contents. If a user or automated system were tricked into listing a specially crafted archive, an attacker could possibly use this issue to inject misleading output or malicious terminal control sequences. (CVE-2026-66486)
Affected QuantaStor releases
| Release | Platform | Package | Exposure | Shipped version | Fixed version | Status |
|---|---|---|---|---|---|---|
| 6.9.1.001 | Ubuntu 22.04 LTS | cpio | Internally-facing | 2.13+dfsg-7ubuntu0.1 | 2.13+dfsg-7ubuntu0.2 | Fixed by QuantaStor security update |
| 6.9.0.464 | Ubuntu 22.04 LTS | cpio | Internally-facing | 2.13+dfsg-7ubuntu0.1 | 2.13+dfsg-7ubuntu0.2 | Fixed by QuantaStor security update |
| 6.8.6.015 | Ubuntu 22.04 LTS | cpio | Internally-facing | 2.13+dfsg-7ubuntu0.1 | 2.13+dfsg-7ubuntu0.2 | Fixed by QuantaStor security update |
| 6.8.5.018 | Ubuntu 22.04 LTS | cpio | Internally-facing | 2.13+dfsg-7ubuntu0.1 | 2.13+dfsg-7ubuntu0.2 | Fixed by QuantaStor security update |
| 6.8.4.038 | Ubuntu 22.04 LTS | cpio | Internally-facing | 2.13+dfsg-7ubuntu0.1 | 2.13+dfsg-7ubuntu0.2 | Fixed by QuantaStor security update |
| 6.8.3.018 | Ubuntu 22.04 LTS | cpio | Internally-facing | 2.13+dfsg-7ubuntu0.1 | 2.13+dfsg-7ubuntu0.2 | Fixed by QuantaStor security update |
| 6.8.2.002 | Ubuntu 22.04 LTS | cpio | Internally-facing | 2.13+dfsg-7ubuntu0.1 | 2.13+dfsg-7ubuntu0.2 | Fixed by QuantaStor security update |
| 6.8.1.007 | Ubuntu 22.04 LTS | cpio | Internally-facing | 2.13+dfsg-7ubuntu0.1 | 2.13+dfsg-7ubuntu0.2 | Fixed by QuantaStor security update |
| 6.8.0.205 | Ubuntu 22.04 LTS | cpio | Internally-facing | 2.13+dfsg-7ubuntu0.1 | 2.13+dfsg-7ubuntu0.2 | Fixed by QuantaStor security update |
Internally-facing: only accessible when logged into the QuantaStor console/ssh as the qadmin administrative sudo user; generally lower priority. Externally-facing: part of a service the storage platform presents on the network (or the kernel), so potentially reachable over the network.
CVEs
CVE-2026-66485, CVE-2026-66484, CVE-2026-66486
References
https://ubuntu.com/security/notices/USN-8704-1
https://nvd.nist.gov/vuln/detail/CVE-2026-66485
https://nvd.nist.gov/vuln/detail/CVE-2026-66484
https://nvd.nist.gov/vuln/detail/CVE-2026-66486
Update
Fixes marked Fixed by QuantaStor security update are applied by upgrading QuantaStor with security patches included (Upgrade Manager). Fixed package versions:
| Platform | Package | Version |
|---|---|---|
| bionic | cpio | 2.12+dfsg-6ubuntu0.18.04.4+esm1 |
| Ubuntu 20.04 LTS | cpio | 2.13+dfsg-2ubuntu0.4+esm1 |
| Ubuntu 22.04 LTS | cpio | 2.13+dfsg-7ubuntu0.2 |
| Ubuntu 24.04 LTS | cpio | 2.15+dfsg-1ubuntu2.1 |
| resolute | cpio | 2.15+dfsg-2.1ubuntu0.1 |
| trusty | cpio | 2.11+dfsg-1ubuntu1.2+esm3 |
| xenial | cpio | 2.11+dfsg-5ubuntu1.1+esm2 |