CVE-2026-93782

vhost-scsi: flush backend after device ioctls

State: Published
Severity: 7.8 High
Published: Sep 24, 2026
Updated: Oct 3, 2026
Reserved: Sep 18, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

vhost-scsi: flush backend after device ioctls

vhost-scsi translates guest response descriptors into userspace iovecs when commands are submitted. Target-core completes those commands asynchronously, so VHOST_SET_MEM_TABLE can replace the memory table while an in-flight command still retains response iovecs translated through the old table.

If the old mapping is reused after VHOST_SET_MEM_TABLE returns, command completion can write the response to an unrelated userspace object.

Flush the vhost-scsi backend after vhost_dev_ioctl() handles a device ioctl. This waits for in-flight commands that can still use the old response iovecs before the ioctl returns.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	057cbf49a1f08297877e46c82f707b1bfea806a8 to before 6436411203d8c702ffc055700f1a6bde488ff681Affected 057cbf49a1f08297877e46c82f707b1bfea806a8 to before cec088285adcc7ae23c119b6bbdb22270dc2de8fAffected 057cbf49a1f08297877e46c82f707b1bfea806a8 to before e0bf6bed528693a6b32439ab122b34a34b66d96fAffected 057cbf49a1f08297877e46c82f707b1bfea806a8 to before be2636e1b21fe860db918152abf2932638d06ed7Affected 057cbf49a1f08297877e46c82f707b1bfea806a8 to before 981c97d09c6b9560bb12dcc41f11ce59b1a48e97Affected 057cbf49a1f08297877e46c82f707b1bfea806a8 to before 6c1b802e36b05ebd9d41686c4dce6f06966af469Affected 057cbf49a1f08297877e46c82f707b1bfea806a8 to before 22598f55a4c2b510b3df5e69e563387a963222aeAffected
LinuxLinux	3.6Affected before 3.6Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.111 through 6.12.Not affected 6.18.53 through 6.18.Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

057cbf49a1f08297877e46c82f707b1bfea806a8 to before 6436411203d8c702ffc055700f1a6bde488ff681Affected
057cbf49a1f08297877e46c82f707b1bfea806a8 to before cec088285adcc7ae23c119b6bbdb22270dc2de8fAffected
057cbf49a1f08297877e46c82f707b1bfea806a8 to before e0bf6bed528693a6b32439ab122b34a34b66d96fAffected
057cbf49a1f08297877e46c82f707b1bfea806a8 to before be2636e1b21fe860db918152abf2932638d06ed7Affected
057cbf49a1f08297877e46c82f707b1bfea806a8 to before 981c97d09c6b9560bb12dcc41f11ce59b1a48e97Affected
057cbf49a1f08297877e46c82f707b1bfea806a8 to before 6c1b802e36b05ebd9d41686c4dce6f06966af469Affected
057cbf49a1f08297877e46c82f707b1bfea806a8 to before 22598f55a4c2b510b3df5e69e563387a963222aeAffected

LinuxLinux

3.6Affected
before 3.6Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.111 through 6.12.*Not affected
6.18.53 through 6.18.*Not affected
7.2 and laterNot affected

References

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