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PUBLISHED

CVE-2021-46966

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

Reserved:2024-02-27
Published:2024-02-27
Updated:2024-04-04

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.

Product status

Default status
unaffected

4bda2b79a9d0 before 1d53ca5d1310
affected

5c12dadcbef8 before 8b04d57f30ca
affected

35b88a10535e before 90575d1d9311
affected

e4467fb6ef54 before a5b26a2e362f
affected

03d1571d9513 before 72814a94c38a
affected

03d1571d9513 before 62dc2440ebb5
affected

03d1571d9513 before f16737caf41f
affected

03d1571d9513 before b7a5baaae212
affected

03d1571d9513 before e483bb9a991b
affected

Default status
affected

5.4
affected

Any version before 5.4
unaffected

4.4.269
unaffected

4.9.269
unaffected

4.14.233
unaffected

4.19.191
unaffected

5.4.118
unaffected

5.10.36
unaffected

5.11.20
unaffected

5.12.3
unaffected

5.13
unaffected

References

https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394

https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9be

https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23

https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17

https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b

https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203

https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b

https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234

https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa

cve.org CVE-2021-46966

nvd.nist.gov CVE-2021-46966

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