Confirmed as exploited
CVE-2023-0266
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
01 / ACTION
Required action
Apply updates per vendor instructions.
02 / AFFECTED SOFTWARE
Affected packages
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In ctl_elem_read_user, ctl_elem_write_user of control_compat.c, there is a possible memory corruption due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
Linux kernel contains a use-after-free vulnerability that allows for privilege escalation to gain ring0 access from the system user.
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
05 / REFERENCES
Further evidence
- https://android.googlesource.com/kernel/common/+/cc6c5c7fa237f65b08b9618188efe4b24b9cd886
- https://source.android.com/security/bulletin/2023-04-01
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-5.10/alsa-pcm-move-rwsem-lock-inside-snd_ctl_elem_read-to-prevent-uaf.patch?id=72783cf35e6c55bca84c4bb7b776c58152856fd4
- https://github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb055e
- https://github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02e1
- https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-0266