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Vulnerability · Published Feb 27, 2024 · Assigned by Linux

CVE-2021-46966ACPI: custom_method: fix potential use-after-free issue

High 7.8

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.2%top 86.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.38-1DEBIAN-CVE-2021-46966
Debian:13linux5.10.38-1DEBIAN-CVE-2021-46966
Debian:14linux5.10.38-1DEBIAN-CVE-2021-46966
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-46966
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-46966
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-46966

Affected products (as reported)

VendorProductVersions
Linux Linux 4bda2b79a9d04c8ba31681c66e95877dbb433416 – before 1d53ca5d131074c925ce38361fb0376d3bf7e3945c12dadcbef8cd55ef1f5dac799bfcbb7ea7db1d – before 8b04d57f30caf76649d0567551589af9a66ca9be35b88a10535edcf62d3e6b7893a8cd506ff98a24 – before 90575d1d9311b753cf1718f4ce9061ddda7dfd23e4467fb6ef547aa352dc03397f9474ec84eced5b – before a5b26a2e362f572d87e9fd35435680e557052a1703d1571d9513369c17e6848476763ebbd10ec2cb – before 72814a94c38a33239793f7622cec6ace1e540c4b03d1571d9513369c17e6848476763ebbd10ec2cb – before 62dc2440ebb552aa0d7f635e1697e077d9d2120303d1571d9513369c17e6848476763ebbd10ec2cb – before f16737caf41fc06cfe6e49048becb09657074d4b03d1571d9513369c17e6848476763ebbd10ec2cb – before b7a5baaae212a686ceb812c32fceed79c03c0234
Linux Linux 5.4

References