Use After Free Affecting perf package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (5th percentile)

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  • Snyk IDSNYK-RHEL8-PERF-7503496
  • published17 Jul 2024
  • disclosed16 Jul 2024

Introduced: 16 Jul 2024

CVE-2022-48790  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 perf.

NVD Description

Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1