CVE-2018-20856

unknown

Published — · Modified —

CVSS v3

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CVSS v2

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VIR risk

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Description

An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2018-20856

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2018-20856.html

OS impact

OS	Version	Status	Fixed in
sles		affected
debian	bookworm	fixed	`4.18.8-1`
debian	bullseye	fixed	`4.18.8-1`
debian	forky	fixed	`4.18.8-1`
debian	sid	fixed	`4.18.8-1`
debian	trixie	fixed	`4.18.8-1`

References

https://www.suse.com/security/cve/CVE-2018-20856.html
https://security-tracker.debian.org/tracker/CVE-2018-20856

Verify integrity in audit chain (admin only). AS-IS.