What’s Vulnerable › Vulnerabilities

CVE-2017-17807

• Severity: low (CVSS 3.3 v3.0)
• 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: 2017-12-20 · updated 2026-06-17
• Weakness: CWE-862

Description

The KEYS subsystem in the Linux kernel before 4.14.6 omitted an access-control check when adding a key to the current task's "default request-key keyring" via the request_key() system call, allowing a local user to use a sequence of crafted system calls to add keys to a keyring with only Search permission (not Write permission) to that keyring, related to construct_get_dest_keyring() in security/keys/request_key.c.

Affected products

• Linux kernel: before 4.14.6 — fixed in 4.14.6

How to fix

Upgrade to a fixed version: Linux kernel 4.14.6. Check the vendor advisory for mitigations.

References

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4dca6ea1d9432052afb06baf2e3ae78188a4410b
• http://www.securityfocus.com/bid/102301
• https://github.com/torvalds/linux/commit/4dca6ea1d9432052afb06baf2e3ae78188a4410b
• https://lists.debian.org/debian-lts-announce/2018/01/msg00004.html
• https://usn.ubuntu.com/3617-1/
• https://usn.ubuntu.com/3617-2/
• https://usn.ubuntu.com/3617-3/
• https://usn.ubuntu.com/3619-1/
• https://usn.ubuntu.com/3619-2/
• https://usn.ubuntu.com/3620-1/
• https://usn.ubuntu.com/3620-2/
• https://usn.ubuntu.com/3632-1/

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