CVE-2018-16841

high

Published — · Modified —

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CVSS v3

—

CVSS v4 NEW

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not yet in upstream

VIR risk

8.0

Description

Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`4.9.3-1`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`2:4.9.2+dfsg-2`
sid	Fixed	`2:4.9.2+dfsg-2`
forky	Fixed	`2:4.9.2+dfsg-2`
bullseye	Fixed	`2:4.9.2+dfsg-2`
bookworm	Fixed	`2:4.9.2+dfsg-2`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

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