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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.
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Title: Linux, Description: En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:
drm/v3d: Rechazar extensión multisync vacía para prevenir bucle infinito
v3d_get_extensions() recorre una lista enlazada simple de extensiones ioctl proporcionada por el espacio de usuario sin ningún límite en la longitud de la cadena. Un usuario local puede crear una extensión autorreferencial (ext->next == &ext) con in_sync_count y out_sync_count en cero, lo que elude la protección existente contra extensiones duplicadas:
if (se->in_sync_count || se->out_sync_count)
return -EINVAL;
La protección nunca se activa porque v3d_get_multisync_post_deps() devuelve inmediatamente cuando count es cero, dejando ambos campos en cero en cada iteración. El resultado es un bucle infinito en contexto de kernel, bloqueando el hilo llamador y acaparando un núcleo de CPU indefinidamente.
Solucione esto rechazando una extensión multisync donde tanto in_sync_count como out_sync_count son cero en v3d_get_multisync_submit_deps(). Una multisync vacía no lleva información de sincronización y no tiene ningún propósito útil, por lo que devolver -EINVAL para dicha extensión es la defensa correcta contra este vector de ataque.
Initial Analysis by NIST7/08/2026 10:50:58 AM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Added
CWE
CWE-835
Added
CPE Configuration
OR
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.9
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.176
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.18.33
New CVE Received from kernel.org6/08/2026 1:16:50 PM
Action
Type
Old Value
New Value
Added
Description
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.
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