CVE-2019-16921

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-09-27 · updated 2026-06-17
Weakness: CWE-665

Description

In the Linux kernel before 4.17, hns_roce_alloc_ucontext in drivers/infiniband/hw/hns/hns_roce_main.c does not initialize the resp data structure, which might allow attackers to obtain sensitive information from kernel stack memory, aka CID-df7e40425813.

Affected products

Linux kernel: before 4.17 — fixed in 4.17

How to fix

Upgrade to a fixed version: Linux kernel 4.17. Check the vendor advisory for mitigations.

References

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=df7e40425813c50cd252e6f5e348a81ef1acae56
https://github.com/torvalds/linux/commit/df7e40425813c50cd252e6f5e348a81ef1acae56
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=df7e40425813c50cd252e6f5e348a81ef1acae56
https://github.com/torvalds/linux/commit/df7e40425813c50cd252e6f5e348a81ef1acae56

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