Description
In the Linux kernel, the following vulnerability has been resolved: vhost-scsi: protect vq->log_used with vq->mutex The vhost-scsi completion path may access vq->log_base when vq->log_used is already set to false. vhost-thread QEMU-thread vhost_scsi_complete_cmd_work() -> vhost_add_used() -> vhost_add_used_n() if (unlikely(vq->log_used)) QEMU disables vq->log_used via VHOST_SET_VRING_ADDR. mutex_lock(&vq->mutex); vq->log_used = false now! mutex_unlock(&vq->mutex); QEMU gfree(vq->log_base) log_used() -> log_write(vq->log_base) Assuming the VMM is QEMU. The vq->log_base is from QEMU userpace and can be reclaimed via gfree(). As a result, this causes invalid memory writes to QEMU userspace. The control queue path has the same issue.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
057cbf49a1f08297877e46c82f707b1bfea806a8 to < 80cf68489681c165ded460930e391b1eb37b5f6faffected057cbf49a1f08297877e46c82f707b1bfea806a8 to < 8312a1ccff1566f375191a89b9ba71b6eb48a8cdaffected057cbf49a1f08297877e46c82f707b1bfea806a8 to < 59614c5acf6688f7af3c245d359082c0e9e53117affected057cbf49a1f08297877e46c82f707b1bfea806a8 to < ca85c2d0db5f8309832be45858b960d933c2131caffected057cbf49a1f08297877e46c82f707b1bfea806a8 to < bd8c9404e44adb9f6219c09b3409a61ab7ce3427affected057cbf49a1f08297877e46c82f707b1bfea806a8 to < c0039e3afda29be469d29b3013d7f9bdee136834affected057cbf49a1f08297877e46c82f707b1bfea806a8 to < f591cf9fce724e5075cc67488c43c6e39e8cbe27affected
Linux Linux
Default version status: affected
3.6affected0 to < 3.6unaffected5.10.240 to ≤ 5.10.*unaffected5.15.189 to ≤ 5.15.*unaffected6.1.146 to ≤ 6.1.*unaffected6.6.93 to ≤ 6.6.*unaffected6.12.31 to ≤ 6.12.*unaffected6.14.9 to ≤ 6.14.*unaffected6.15 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/80cf68489681c165ded460930e391b1eb37b5f6f ↗
- https://git.kernel.org/stable/c/8312a1ccff1566f375191a89b9ba71b6eb48a8cd ↗
- https://git.kernel.org/stable/c/59614c5acf6688f7af3c245d359082c0e9e53117 ↗
- https://git.kernel.org/stable/c/ca85c2d0db5f8309832be45858b960d933c2131c ↗
- https://git.kernel.org/stable/c/bd8c9404e44adb9f6219c09b3409a61ab7ce3427 ↗
- https://git.kernel.org/stable/c/c0039e3afda29be469d29b3013d7f9bdee136834 ↗
- https://git.kernel.org/stable/c/f591cf9fce724e5075cc67488c43c6e39e8cbe27 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html ↗