CVE-2017-5551

low-risk

Published 2017-02-06

The simple_set_acl function in fs/posix_acl.c in the Linux kernel before 4.9.6 preserves the setgid bit during a setxattr call involving a tmpfs filesystem, which allows local users to gain group privileges by leveraging the existence of a setgid program with restrictions on execute permissions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-7097.

Do I need to act?

0.06% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 4.4/10 Medium

LOCAL / LOW complexity

Affected Products (1)

Linux Kernel

Affected Vendors

Linux

References (16)

Issue Tracking http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=497de0...

http://www.debian.org/security/2017/dsa-3791

Release Notes http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.6

Mailing List http://www.openwall.com/lists/oss-security/2017/01/21/3

Third Party Advisory http://www.securityfocus.com/bid/95717

http://www.securitytracker.com/id/1038053

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1416126

Issue Tracking https://github.com/torvalds/linux/commit/497de07d89c1410d76a15bec2bb41f24a2a89f3...

Issue Tracking http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=497de0...

http://www.debian.org/security/2017/dsa-3791

Release Notes http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.6

Mailing List http://www.openwall.com/lists/oss-security/2017/01/21/3

Third Party Advisory http://www.securityfocus.com/bid/95717

http://www.securitytracker.com/id/1038053

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1416126

Issue Tracking https://github.com/torvalds/linux/commit/497de07d89c1410d76a15bec2bb41f24a2a89f3...

/ 100

low-risk

Severity 15/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal