CVE-2021-46966

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4bda2b79a9d04c8ba31681c66e95877dbb433416 < 1d53ca5d131074c925ce38361fb0376d3bf7e394affected
LinuxLinux5c12dadcbef8cd55ef1f5dac799bfcbb7ea7db1d < 8b04d57f30caf76649d0567551589af9a66ca9beaffected
LinuxLinux35b88a10535edcf62d3e6b7893a8cd506ff98a24 < 90575d1d9311b753cf1718f4ce9061ddda7dfd23affected
LinuxLinuxe4467fb6ef547aa352dc03397f9474ec84eced5b < a5b26a2e362f572d87e9fd35435680e557052a17affected
LinuxLinux03d1571d9513369c17e6848476763ebbd10ec2cb < 72814a94c38a33239793f7622cec6ace1e540c4baffected
LinuxLinux03d1571d9513369c17e6848476763ebbd10ec2cb < 62dc2440ebb552aa0d7f635e1697e077d9d21203affected
LinuxLinux03d1571d9513369c17e6848476763ebbd10ec2cb < f16737caf41fc06cfe6e49048becb09657074d4baffected
LinuxLinux03d1571d9513369c17e6848476763ebbd10ec2cb < b7a5baaae212a686ceb812c32fceed79c03c0234affected
LinuxLinux03d1571d9513369c17e6848476763ebbd10ec2cb < e483bb9a991bdae29a0caa4b3a6d002c968f94aaaffected
LinuxLinux70424999fbf1f160ade111cb9baab51776e0f9c2affected
LinuxLinux06cd4a06eb596a888239fb8ceb6ea15677cab396affected
LinuxLinux4.4.195 < 4.4.269affected
LinuxLinux4.9.195 < 4.9.269affected
LinuxLinux4.14.147 < 4.14.233affected
LinuxLinux4.19.77 < 4.19.191affected
LinuxLinux5.2.19 < 5.3affected
LinuxLinux5.3.4 < 5.4affected
LinuxLinux5.4affected
LinuxLinux0 < 5.4unaffected
LinuxLinux4.4.269 <= 4.4.*unaffected
LinuxLinux4.9.269 <= 4.9.*unaffected
LinuxLinux4.14.233 <= 4.14.*unaffected
LinuxLinux4.19.191 <= 4.19.*unaffected
LinuxLinux5.4.118 <= 5.4.*unaffected
LinuxLinux5.10.36 <= 5.10.*unaffected
LinuxLinux5.11.20 <= 5.11.*unaffected
LinuxLinux5.12.3 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References