CVE-2021-46966
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.23%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.23% probability · 14th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394Patch
- https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203Patch
- https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4bPatch
- https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9bePatch
- https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23Patch
- https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17Patch
- https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234Patch
- https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aaPatch
- https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4bPatch
- https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394Patch
- https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203Patch
- https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4bPatch
- https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9bePatch
- https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23Patch
- https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17Patch
- https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234Patch
- https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aaPatch
- https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4bPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.