CVE-2026-46314 is a vulnerability in Linux Kernel
Published on June 8, 2026
drm/v3d: Reject empty multisync extension to prevent infinite loop
In the Linux kernel, the following vulnerability has been resolved:
drm/v3d: Reject empty multisync extension to prevent infinite loop
v3d_get_extensions() walks a userspace-provided singly-linked list of
ioctl extensions without any bound on the chain length. A local user
can craft a self-referential extension (ext->next == &ext) with zero
in_sync_count and out_sync_count, which bypasses the existing duplicate-
extension guard:
if (se->in_sync_count || se->out_sync_count)
return -EINVAL;
The guard never fires because v3d_get_multisync_post_deps() returns
immediately when count is zero, leaving both fields at zero on every
iteration. The result is an infinite loop in kernel context, blocking
the calling thread and pegging a CPU core indefinitely.
Fix this by rejecting a multisync extension where both in_sync_count
and out_sync_count are zero in v3d_get_multisync_submit_deps(). An
empty multisync carries no synchronization information and serves no
useful purpose, so returning -EINVAL for such an extension is the
correct defense against this attack vector.
Products Associated with CVE-2026-46314
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version e4165ae8304e5ea822fbe5909dd3be5445c058b7 and below 4fa42a249e8cd6ed17aea04e5695b6e9001f2433 is affected.
- Version e4165ae8304e5ea822fbe5909dd3be5445c058b7 and below 9c5164781cb388d219d8f49fa0f0b04cf86ad544 is affected.
- Version e4165ae8304e5ea822fbe5909dd3be5445c058b7 and below fb44d589bf3148e13452185a6e772a7efbf2d684 is affected.
- Version 5.16 is affected.
- Before 5.16 is unaffected.
- Version 6.18.33, <= 6.18.* is unaffected.
- Version 7.0.9, <= 7.0.* is unaffected.
- Version 7.1-rc1, <= * is unaffected.