Riskcovery

CVE-2021-47533

drm/vc4: kms: Clear the HVS FIFO commit pointer once done

State
Published
Severity
7.8 High
Published
May 24, 2024
Updated
Aug 5, 2026
Reserved
May 24, 2024

Read the record on cve.org

Description

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

drm/vc4: kms: Clear the HVS FIFO commit pointer once done

Commit 9ec03d7f1ed3 ("drm/vc4: kms: Wait on previous FIFO users before a commit") introduced a wait on the previous commit done on a given HVS FIFO.

However, we never cleared that pointer once done. Since drm_crtc_commit_put can free the drm_crtc_commit structure directly if we were the last user, this means that it can lead to a use-after free if we were to duplicate the state, and that stale pointer would even be copied to the new state.

Set the pointer to NULL once we're done with the wait so that we don't carry over a pointer to a free'd structure.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 9ec03d7f1ed394897891319a4dda75f52c5d292d to before 2931db9a5ed219546cf2ae0546698faf78281b89Affected
  • 9ec03d7f1ed394897891319a4dda75f52c5d292d to before d134c5ff71c7f2320fc7997f2fbbdedf0c76889aAffected
LinuxLinux
  • 5.12Affected
  • before 5.12Not affected
  • 5.15.7 through 5.15.*Not affected
  • 5.16 and laterNot affected

References

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