NULL pointer dereference/Race condition in Linux kernel - CVE-2015-7550
Published: April 17, 2018
Vulnerability identifier: #VU11852
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2015-7550
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to cause DoS condition on the target system.
The weakness in the keyctl_read_key function in security/keys/keyctl.c due to improper use of a semaphore. A local attacker can submit a specially crafted application that leverages a race condition between keyctl_revoke and keyctl_read calls, trigger NULL pointer dereference and cause the service o crash.
The weakness in the keyctl_read_key function in security/keys/keyctl.c due to improper use of a semaphore. A local attacker can submit a specially crafted application that leverages a race condition between keyctl_revoke and keyctl_read calls, trigger NULL pointer dereference and cause the service o crash.
Affected software
Linux kernel
Ubuntu
Fedora
kernel
Ubuntu
Fedora
kernel
How to mitigate CVE-2015-7550
Update to version 4.3.4.
kernel - addressed in versions 4.2.8-200.fc22, 4.2.8-300.fc23