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CVE-2026-93782

Linux: vhost-scsi: flush backend after device ioctls

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.12%Chance of exploitation activity in the next 30 days, higher than 1% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6436411203d8c702ffc055700f1a6bde488ff681Also 981c97d09c6b9560bb12dcc41f11ce59b1a48e97, 6c1b802e36b05ebd9d41686c4dce6f06966af469 and 1 moreCVE List
Published24 Sep 2026Updated 3 Oct 2026CVE List

What fixes it

  • 6436411203d8c702ffc055700f1a6bde488ff681LinuxCVE List
  • 981c97d09c6b9560bb12dcc41f11ce59b1a48e97LinuxCVE List
  • 6c1b802e36b05ebd9d41686c4dce6f06966af469LinuxCVE List
  • 22598f55a4c2b510b3df5e69e563387a963222aeLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 16

  • Linuxaffected: 057cbf49a1f08297877e46c82f707b1bfea806a8 before 6436411203d8c702ffc055700f1a6bde488ff681CVE List
  • Linuxaffected: 057cbf49a1f08297877e46c82f707b1bfea806a8 before cec088285adcc7ae23c119b6bbdb22270dc2de8fCVE List
  • Linuxaffected: 057cbf49a1f08297877e46c82f707b1bfea806a8 before e0bf6bed528693a6b32439ab122b34a34b66d96fCVE List
  • Linuxaffected: 057cbf49a1f08297877e46c82f707b1bfea806a8 before be2636e1b21fe860db918152abf2932638d06ed7CVE List
  • Linuxaffected: 057cbf49a1f08297877e46c82f707b1bfea806a8 before 981c97d09c6b9560bb12dcc41f11ce59b1a48e97CVE List
  • Linuxaffected: 057cbf49a1f08297877e46c82f707b1bfea806a8 before 6c1b802e36b05ebd9d41686c4dce6f06966af469CVE List
  • Linuxaffected: 057cbf49a1f08297877e46c82f707b1bfea806a8 before 22598f55a4c2b510b3df5e69e563387a963222aeCVE List
  • Linuxaffected: 3.6CVE List
  • Linuxunaffected: all versions before 3.6CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2CVE List

References 7