CVE-2017-9461

Publication date 6 June 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

smbd in Samba before 4.4.10 and 4.5.x before 4.5.6 has a denial of service vulnerability (fd_open_atomic infinite loop with high CPU usage and memory consumption) due to wrongly handling dangling symlinks.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
samba	17.10 artful	Not affected
	17.04 zesty	Not affected
	16.10 yakkety	Fixed 2:4.4.5+dfsg-2ubuntu5.7
	16.04 LTS xenial	Fixed 2:4.3.11+dfsg-0ubuntu0.16.04.8
	14.04 LTS trusty	Fixed 2:4.3.11+dfsg-0ubuntu0.14.04.9

Notes

leosilva

precise/esm hasn't the code affect.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
samba	Upstream: https://git.samba.org/?p=samba.git;a=commit;h=10c3e3923022485c720f322ca4f0aca5d7501310 Upstream: https://git.samba.org/?p=samba.git;a=commit;h=f289980e5531372dd63ec483e265e48efb8cf207

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H