In the Linux kernel, the following vulnerability has been resolved:
dma-buf: fix UAF in dma_buf_fd() tracepoint
Once FD_ADD() returns, the fd is live in the file descriptor table
and a thread sharing that table can close() it before DMA_BUF_TRACE()
runs. The close drops the last reference, __fput() frees the dma_buf,
and the tracepoint then dereferences dmabuf to take dmabuf->name_lock
-- slab-use-after-free.
Split FD_ADD() back into get_unused_fd_flags() + fd_install() and
emit the tracepoint between them. While the fdtable slot is reserved
with a NULL file pointer, a racing close() returns -EBADF without
entering __fput(), so the dma_buf stays alive across the trace. Same
approach as commit 2d76319c4cbb ("dma-buf: fix UAF in dma_buf_put()
tracepoint").
This undoes the FD_ADD() conversion done in commit 34dfce523c90
("dma: convert dma_buf_fd() to FD_ADD()"); FD_ADD() has no place to
hook the tracepoint safely.
References
Configurations
Configuration 1 (hide)
|
History
30 Oct 2026, 14:29
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-416 | |
| CPE | cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* |
|
| First Time |
Linux linux Kernel
Linux |
|
| References | () https://git.kernel.org/stable/c/b569f86e2f8dbf6f11d31d3de794d22e18098b23 - Patch | |
| References | () https://git.kernel.org/stable/c/ead6680f354f83966c796fc7f9463a3171789616 - Patch |
Information
Published : 2026-07-19 16:17
Updated : 2026-10-30 14:29
NVD link : CVE-2026-63910
Mitre link : CVE-2026-63910
CVE.ORG link : CVE-2026-63910
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-416
Use After Free