CVE-2021-46966

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

State: Published
Severity: Not scored
Published: Feb 27, 2024
Updated: May 23, 2026
Reserved: Feb 27, 2024

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	4bda2b79a9d04c8ba31681c66e95877dbb433416 to before 1d53ca5d131074c925ce38361fb0376d3bf7e394Affected 5c12dadcbef8cd55ef1f5dac799bfcbb7ea7db1d to before 8b04d57f30caf76649d0567551589af9a66ca9beAffected 35b88a10535edcf62d3e6b7893a8cd506ff98a24 to before 90575d1d9311b753cf1718f4ce9061ddda7dfd23Affected e4467fb6ef547aa352dc03397f9474ec84eced5b to before a5b26a2e362f572d87e9fd35435680e557052a17Affected 03d1571d9513369c17e6848476763ebbd10ec2cb to before 72814a94c38a33239793f7622cec6ace1e540c4bAffected 03d1571d9513369c17e6848476763ebbd10ec2cb to before 62dc2440ebb552aa0d7f635e1697e077d9d21203Affected 03d1571d9513369c17e6848476763ebbd10ec2cb to before f16737caf41fc06cfe6e49048becb09657074d4bAffected 03d1571d9513369c17e6848476763ebbd10ec2cb to before b7a5baaae212a686ceb812c32fceed79c03c0234Affected 03d1571d9513369c17e6848476763ebbd10ec2cb to before e483bb9a991bdae29a0caa4b3a6d002c968f94aaAffected 70424999fbf1f160ade111cb9baab51776e0f9c2Affected 06cd4a06eb596a888239fb8ceb6ea15677cab396Affected 4.4.195 to before 4.4.269Affected 4.9.195 to before 4.9.269Affected 4.14.147 to before 4.14.233Affected 4.19.77 to before 4.19.191Affected 5.2.19 to before 5.3Affected 5.3.4 to before 5.4Affected
LinuxLinux	5.4Affected before 5.4Not affected 4.4.269 through 4.4.Not affected 4.9.269 through 4.9.Not affected 4.14.233 through 4.14.Not affected 4.19.191 through 4.19.Not affected 5.4.118 through 5.4.Not affected 5.10.36 through 5.10.Not affected 5.11.20 through 5.11.Not affected 5.12.3 through 5.12.Not affected 5.13 and laterNot affected

Product

Versions

LinuxLinux

4bda2b79a9d04c8ba31681c66e95877dbb433416 to before 1d53ca5d131074c925ce38361fb0376d3bf7e394Affected
5c12dadcbef8cd55ef1f5dac799bfcbb7ea7db1d to before 8b04d57f30caf76649d0567551589af9a66ca9beAffected
35b88a10535edcf62d3e6b7893a8cd506ff98a24 to before 90575d1d9311b753cf1718f4ce9061ddda7dfd23Affected
e4467fb6ef547aa352dc03397f9474ec84eced5b to before a5b26a2e362f572d87e9fd35435680e557052a17Affected
03d1571d9513369c17e6848476763ebbd10ec2cb to before 72814a94c38a33239793f7622cec6ace1e540c4bAffected
03d1571d9513369c17e6848476763ebbd10ec2cb to before 62dc2440ebb552aa0d7f635e1697e077d9d21203Affected
03d1571d9513369c17e6848476763ebbd10ec2cb to before f16737caf41fc06cfe6e49048becb09657074d4bAffected
03d1571d9513369c17e6848476763ebbd10ec2cb to before b7a5baaae212a686ceb812c32fceed79c03c0234Affected
03d1571d9513369c17e6848476763ebbd10ec2cb to before e483bb9a991bdae29a0caa4b3a6d002c968f94aaAffected
70424999fbf1f160ade111cb9baab51776e0f9c2Affected
06cd4a06eb596a888239fb8ceb6ea15677cab396Affected
4.4.195 to before 4.4.269Affected
4.9.195 to before 4.9.269Affected
4.14.147 to before 4.14.233Affected
4.19.77 to before 4.19.191Affected
5.2.19 to before 5.3Affected
5.3.4 to before 5.4Affected

LinuxLinux

5.4Affected
before 5.4Not affected
4.4.269 through 4.4.*Not affected
4.9.269 through 4.9.*Not affected
4.14.233 through 4.14.*Not affected
4.19.191 through 4.19.*Not affected
5.4.118 through 5.4.*Not affected
5.10.36 through 5.10.*Not affected
5.11.20 through 5.11.*Not affected
5.12.3 through 5.12.*Not affected
5.13 and laterNot affected

References

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