USN-6699-1: Linux kernel vulnerabilities
Reima Ishii discovered that the nested KVM implementation for Intel x86 processors in the Linux kernel did not properly validate control registers in certain situations. An attacker in a guest VM could use this to cause a denial of service (guest crash). (CVE-2023-30456) It was discovered that the Quick Fair Queueing scheduler implementation in the Linux kernel did not properly handle network packets in certain conditions, leading to a use after free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-4921) It was discovered that a race condition existed in the SCSI Emulex LightPulse Fibre Channel driver in the Linux kernel when unregistering FCF and re-scanning an HBA FCF table, leading to a null pointer dereference vulnerability. A local attacker could use this to cause a denial of service (system crash). (CVE-2024-24855)
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
ubuntu/linux-image-3.13.0-197-genericto a version that resolves this vulnerability.Fixed in 3.13.0-197.248 - Upgrade
Upgrade
ubuntu/linux-image-3.13.0-197-lowlatencyto a version that resolves this vulnerability.Fixed in 3.13.0-197.248 - Upgrade
Upgrade
ubuntu/linux-image-genericto a version that resolves this vulnerability.Fixed in 3.13.0.197.207 - Upgrade
Upgrade
ubuntu/linux-image-generic-lts-trustyto a version that resolves this vulnerability.Fixed in 3.13.0.197.207 - Upgrade
Upgrade
ubuntu/linux-image-lowlatencyto a version that resolves this vulnerability.Fixed in 3.13.0.197.207 - Upgrade
Upgrade
ubuntu/linux-image-serverto a version that resolves this vulnerability.Fixed in 3.13.0.197.207 - Upgrade
Upgrade
ubuntu/linux-image-virtualto a version that resolves this vulnerability.Fixed in 3.13.0.197.207
Event History
Child vulnerabilities
Contains the following vulnerabilities.
Frequently Asked Questions
What is the severity of USN-6699-1?
The severity of USN-6699-1 is considered critical due to its potential to cause denial of service in guest VMs.
How do I fix USN-6699-1?
To fix USN-6699-1, users should update their systems to the recommended kernel versions provided in the advisory.
What systems are affected by USN-6699-1?
USN-6699-1 affects Ubuntu 14.04 systems running specific versions of the Linux kernel.
What kind of attack can exploit USN-6699-1?
An attacker in a guest VM can exploit USN-6699-1 to cause a crash of the guest system.
Who discovered the vulnerability in USN-6699-1?
The vulnerability in USN-6699-1 was discovered by Reima Ishii.