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CVE-2021-46966

ACPI: custom_method: fix potential use-after-free issue

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.4.269, 4.9.269, 4.14.233, 4.19.191, 5.3, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

In the Linux kernel, the following vulnerability has been resolved: ACPI: custom_method: fix potential use-after-free issue In cm_write(), buf is always freed when reaching the end of the function. If the requested count is less than table.length, the allocated buffer will be freed but subsequent calls to cm_write() will still try to access it. Remove the unconditional kfree(buf) at the end of the function and set the buf to NULL in the -EINVAL error path to match the rest of function.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 4.4.195 · fixed in 4.4.269; From 4.9.195 · fixed in 4.9.269; From 4.14.147 · fixed in 4.14.233; From 4.19.77 · fixed in 4.19.191; From 5.2.19 · fixed in 5.3; From 5.3.4 · fixed in 5.4

  • Linux Linux

    5.4

References 9

git.kernel.org