Use-after-free in Linux kernel - CVE-2026-63930

Vulnerability identifier: #VU138718

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-63930

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in iio_hw_consumer_alloc() when cleaning up buffers in the error path. A local user can trigger the vulnerable cleanup path to cause a denial of service.

Linux kernel
Ubuntu
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

• https://git.kernel.org/stable/c/29783e6b6ec0b7152a15e53a063f17537e81177d
• https://git.kernel.org/stable/c/2ff615fc455acda5425c4900160cbe11cfea4449
• https://git.kernel.org/stable/c/6f5ed4f2c7c83f33344e0ba179f72a12e5dad4a4
• https://git.kernel.org/stable/c/9319c94f63ed10723afd738d79f5617daba87cc8
• https://git.kernel.org/stable/c/a3763ae33476328cf8d661742deb9daec78eac96
• https://git.kernel.org/stable/c/b71893c57730809c222766e5718bb33610f11963
• https://git.kernel.org/stable/c/d2759d49860b9a39b5cde2fb88e4b822ddf5f58f
• https://git.kernel.org/stable/c/e965627f0d442bfcae3f496c90cb653fb0917a61

• Use-after-free in Linux kernel iio buffer driver
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia