Horizon Alert
Summary of the vulnerability and why it matters
The Linux kernel contains a race condition vulnerability within its POSIX CPU timers. This flaw can occur when a task is exiting and simultaneously being managed by CPU timer functions.
- Linux kernel POSIX CPU timers
- Race condition in task exit and timer deletion
- Potential data corruption and system instability
Attack Path
How an attacker could exploit the issue
A race condition in the Linux kernel's handling of POSIX CPU timers can be exploited when a task is exiting. If a specific sequence of events occurs involving the exiting task and a concurrent timer deletion operation, it can lead to failures in critical kernel functions. This can impact system stability and data integrity.
- Exposure condition: A task is exiting.
- Attacker starting point: Local system access.
- Trigger and result: Race condition causes failures.
Live Threat
Current exploitation, exposure, and threat context
A vulnerability in the Linux kernel could allow an attacker with local access to disrupt system operations, potentially impacting data confidentiality, integrity, and availability. The exploit requires a specific timing condition during process exit and timer deletion, making it complex to achieve. Organizations should prioritize patching systems to mitigate this risk.
- Attackers likely need advanced skills.
- Requires local system access.
- Potential for high business risk.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
The Linux kernel has a resolved race condition vulnerability affecting its POSIX CPU timers. This issue could allow for a task to be unexpectedly reaped, leading to failures in timer deletion operations. Organizations utilizing affected Linux kernel versions should take action to identify and address potential risks.
- Find affected Linux kernel assets.
- Isolate risk or reduce exposure.
- Apply vendor fixes and validate.
- Monitor for related issues.
