CVE-2017-9461

Severity: medium (CVSS 6.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2017-06-06 · updated 2026-06-17
Weakness: CWE-835

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.

Affected products

Debian Linux: 8.0
RedHat Enterprise Linux Desktop: 7.0
RedHat Enterprise Linux Server: 7.0
RedHat Enterprise Linux Server Aus: 7.4, 7.6
RedHat Enterprise Linux Server Eus: 7.4, 7.5, 7.6
RedHat Enterprise Linux Server Tus: 7.6
RedHat Enterprise Linux Workstation: 7.0
Samba: through 4.4.9; 4.5.0, 4.5.1, 4.5.2, 4.5.3, 4.5.4, 4.5.5

References

http://www.securityfocus.com/bid/99455
https://access.redhat.com/errata/RHSA-2017:1950
https://access.redhat.com/errata/RHSA-2017:2338
https://access.redhat.com/errata/RHSA-2017:2778
https://bugs.debian.org/864291
https://bugzilla.samba.org/show_bug.cgi?id=12572
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=10c3e3923022485c720f322ca4f0aca5d7501310
https://lists.debian.org/debian-lts-announce/2019/04/msg00013.html
http://www.securityfocus.com/bid/99455
https://access.redhat.com/errata/RHSA-2017:1950
https://access.redhat.com/errata/RHSA-2017:2338
https://access.redhat.com/errata/RHSA-2017:2778

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