util-linux vulnerabilities

Blkid in util-linux before version 2.26rc-1 allows local users to execute arbitrary code.

CVE-2016-2779 vulnerability in runuser in util-linux allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.

The mkostemp function in login-utils in util-linux, when used incorrectly, allows remote attackers to cause file name collision and possibly other attacks.

A heap use-after-free vulnerability was found in the libblkid library of util-linux. During nested partition probing, a pointer to a parent partition entry becomes stale after array reallocation, allowing an attacker to read freed memory.

In util-linux prior to version 2.41.4, a TOCTOU vulnerability has been identified in the SUID binary /usr/bin/mount. When setting up loop devices, mount validates the source file path with user privileges but later re-canonicalizes and opens it with root privileges without verifying that the path has not been replaced. A local unprivileged user can replace the source file with a symlink pointing to any root-owned file or device.

A flaw was found in util-linux. Improper hostname canonicalization in the `login(1)` utility, when invoked with the `-h` option, can modify the supplied remote hostname before setting `PAM_RHOST`. A remote attacker could exploit this by providing a specially crafted hostname, potentially bypassing host-based PAM access control rules that rely on fully qualified domain names.

A flaw was found in util-linux that allows a heap buffer overread when processing 256-byte usernames in the `setpwnam()` function. This affects SUID login-utils utilities that write to the password database.