CVE-2022-48790

Summary

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

nvme: fix a possible use-after-free in controller reset during load

Unlike .queue_rq, in .submit_async_event drivers may not check the ctrl readiness for AER submission. This may lead to a use-after-free condition that was observed with nvme-tcp.

The race condition may happen in the following scenario:

  1. driver executes its reset_ctrl_work
  2. -> nvme_stop_ctrl - flushes ctrl async_event_work
  3. ctrl sends AEN which is received by the host, which in turn schedules AEN handling
  4. teardown admin queue (which releases the queue socket)
  5. AEN processed, submits another AER, calling the driver to submit
  6. driver attempts to send the cmd ==> use-after-free

In order to fix that, add ctrl state check to validate the ctrl is actually able to accept the AER submission.

This addresses the above race in controller resets because the driver during teardown should:

  1. change ctrl state to RESETTING
  2. flush async_event_work (as well as other async work elements)

So after 1,2, any other AER command will find the ctrl state to be RESETTING and bail out without submitting the AER.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxad22c355b707a8d8d48e282aadc01c0b0604b2e9 < a25e460fbb0340488d119fb2e28fe3f829b7417eaffected
LinuxLinuxad22c355b707a8d8d48e282aadc01c0b0604b2e9 < 70356b756a58704e5c8818cb09da5854af87e765affected
LinuxLinuxad22c355b707a8d8d48e282aadc01c0b0604b2e9 < 0ead57ceb21bbf15963b4874c2ac67143455382faffected
LinuxLinuxad22c355b707a8d8d48e282aadc01c0b0604b2e9 < e043fb5a0336ee74614e26f0d9f36f1f5bb6d606affected
LinuxLinuxad22c355b707a8d8d48e282aadc01c0b0604b2e9 < 9e956a2596ae276124ef0d96829c013dd0faf861affected
LinuxLinuxad22c355b707a8d8d48e282aadc01c0b0604b2e9 < 0fa0f99fc84e41057cbdd2efbfe91c6b2f47dd9daffected
LinuxLinux4.15affected
LinuxLinux0 < 4.15unaffected
LinuxLinux4.19.231 <= 4.19.*unaffected
LinuxLinux5.4.181 <= 5.4.*unaffected
LinuxLinux5.10.102 <= 5.10.*unaffected
LinuxLinux5.15.25 <= 5.15.*unaffected
LinuxLinux5.16.11 <= 5.16.*unaffected
LinuxLinux5.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References