CVE-2018-20855 — An issue was discovered in the Linux kernel before 4

An issue was discovered in the Linux kernel before 4.18.7. In create_qp_common in drivers/infiniband/hw/mlx5/qp.c, mlx5_ib_create_qp_resp was never initialized, resulting in a leak of stack memory to userspace.

01What is this vulnerability?

An issue was discovered in the Linux kernel before 4.18.7. In create_qp_common in drivers/infiniband/hw/mlx5/qp.c, mlx5_ib_create_qp_resp was never initialized, resulting in a leak of stack memory to userspace.

02Affected products

Vendor	Product	Versions
n	a / n/a	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: 2019-07-26T04:39:40.000Z
• Last modified: 2024-08-05T12:12:29.320Z

09References

• github.com — https://github.com/torvalds/linux/commit/0625b4ba1a5d4703c7fb01c497bd6c156908af0…
• git.kernel.org — https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0625b…
• cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.7
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00055.html
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00056.html
• security.netapp.com — https://security.netapp.com/advisory/ntap-20190905-0002/