CVE-2023-52731

Summary

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

fbdev: Fix invalid page access after closing deferred I/O devices

When a fbdev with deferred I/O is once opened and closed, the dirty pages still remain queued in the pageref list, and eventually later those may be processed in the delayed work. This may lead to a corruption of pages, hitting an Oops.

This patch makes sure to cancel the delayed work and clean up the pageref list at closing the device for addressing the bug. A part of the cleanup code is factored out as a new helper function that is called from the common fb_release().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux186b89659c4c67cccead52961eab0ca3b23951dc < 87b9802ca824fcee7915e717e9a60471af62e8e9affected
LinuxLinux56c134f7f1b58be08bdb0ca8372474a4a5165f31 < f1d91f0e9d5a240a809698d7d9c5a538e7dcc149affected
LinuxLinux56c134f7f1b58be08bdb0ca8372474a4a5165f31 < 3efc61d95259956db25347e2a9562c3e54546e20affected
LinuxLinux5.19affected
LinuxLinux0 < 5.19unaffected
LinuxLinux6.1.13 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References