CVE-2021-47427

Summary

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

scsi: iscsi: Fix iscsi_task use after free

Commit d39df158518c ("scsi: iscsi: Have abort handler get ref to conn") added iscsi_get_conn()/iscsi_put_conn() calls during abort handling but then also changed the handling of the case where we detect an already completed task where we now end up doing a goto to the common put/cleanup code. This results in a iscsi_task use after free, because the common cleanup code will do a put on the iscsi_task.

This reverts the goto and moves the iscsi_get_conn() to after we've checked if the iscsi_task is valid.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd39df158518ccc3bf24ee18082b5e100c8f014aa < 1642f51ac0d4f2b55d5748094c49ff8f7191b93caffected
LinuxLinuxd39df158518ccc3bf24ee18082b5e100c8f014aa < 258aad75c62146453d03028a44f2f1590d58e1f6affected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
LinuxLinux5.14.12 <= 5.14.*unaffected
LinuxLinux5.15 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References