CVE-2026-89996
kernel: dma-buf: dma-heap: don't publish fd before copy_to_user() succeeds
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 16, 2026
Updated · October 6, 2026
Description
A flaw was found in the Linux kernel's dma-buf subsystem. A local attacker can exploit a race condition during the DMA_HEAP_IOCTL_ALLOC operation. If the copy_to_user() function fails after a file descriptor (fd) has been installed, the fd is leaked for the lifetime of the process. This continuous leaking of file descriptors can lead to resource exhaustion, resulting in a Denial of Service (DoS) for the affected system.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-772 · Missing Release of Resource after Effective Lifetime