title: Use after free in SNDRV_CTL_IOCTL_ELEM in Linux Kernel
description: A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel. SNDRV_CTL_IOCTL_ELEM_{READ|WRITE}32 is missing locks that can be used in a use-after-free that can result in a priviledge escalation to gain ring0 access from the system user. We recommend upgrading past commit 56b88b50565cd8b946a2d00b0c83927b7ebb055e
problem types: CWE-416 Use After Free
affected:
{
defaultStatus: unaffected
packageName: ALSA pcm
product: Linux Kernel
repo: https://git.kernel.org
vendor: Linux
versions:
lessThan: 56b88b50565cd8b946a2d00b0c83927b7ebb055e, status: affected, version: 4.14, versionType: git
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: ADJACENT_NETWORK
availabilityImpact: HIGH
baseScore: 7.9
baseSeverity: HIGH
confidentialityImpact: LOW
integrityImpact: HIGH
privilegesRequired: LOW
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H
version: 3.1
]
format: CVSS
scenarios: GENERAL