CVE-2023-0266 on CISA KEV

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 upgradin

01What CISA says about this vulnerability

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

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• github.com — https://github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02e…
• git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/que…
• github.com — https://github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb055…
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Linux	Linux Kernel	4.14

06Detection

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