What’s Vulnerable › Vulnerabilities

CVE-2017-17856

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-12-27 · updated 2026-06-17
• Weakness: CWE-119

Description

kernel/bpf/verifier.c in the Linux kernel through 4.14.8 allows local users to cause a denial of service (memory corruption) or possibly have unspecified other impact by leveraging the lack of stack-pointer alignment enforcement.

Affected products

• Debian Linux: 9.0
• Linux kernel: from 4.14 before 4.14.9 — fixed in 4.14.9

How to fix

Upgrade to a fixed version: Linux kernel 4.14.9. Check the vendor advisory for mitigations.

References

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a5ec6ae161d72f01411169a938fa5f8baea16e8f
• http://www.openwall.com/lists/oss-security/2017/12/21/2
• https://github.com/torvalds/linux/commit/a5ec6ae161d72f01411169a938fa5f8baea16e8f
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a5ec6ae161d72f01411169a938fa5f8baea16e8f
• http://www.openwall.com/lists/oss-security/2017/12/21/2
• https://github.com/torvalds/linux/commit/a5ec6ae161d72f01411169a938fa5f8baea16e8f

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