CVE-2018-14656 — A missing address check in the callers of the show_opcodes() in the Linux kernel

A missing address check in the callers of the show_opcodes() in the Linux kernel allows an attacker to dump the kernel memory at an arbitrary kernel address into the dmesg log.

01What is this vulnerability?

A missing address check in the callers of the show_opcodes() in the Linux kernel allows an attacker to dump the kernel memory at an arbitrary kernel address into the dmesg log.

02Affected products

Vendor	Product	Versions
[UNKNOWN]	kernel	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-10-08T22:00:00.000Z
• Last modified: 2024-08-05T09:38:12.828Z

09References

• bugzilla.redhat.com — https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14656
• www.securitytracker.com — http://www.securitytracker.com/id/1041804
• git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=34…
• lore.kernel.org — https://lore.kernel.org/lkml/20180828154901.112726-1-jannh%40google.com/T/
• seclists.org — https://seclists.org/oss-sec/2018/q4/9
• bugs.chromium.org — https://bugs.chromium.org/p/project-zero/issues/detail?id=1650