CVE-2021-46966: ACPI: custom_method: fix potential use-after-free issue
First published: Tue Feb 27 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=4.4.195<4.4.269 | |
| Linux Kernel | >=4.9.195<4.9.269 | |
| Linux Kernel | >=4.14.147<4.14.233 | |
| Linux Kernel | >=4.19.77<4.19.191 | |
| Linux Kernel | >=5.4<5.4.118 | |
| Linux Kernel | >=5.5<5.10.36 | |
| Linux Kernel | >=5.11<5.11.20 | |
| Linux Kernel | >=5.12<5.12.3 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394
- https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203
- https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b
- 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/b7a5baaae212a686ceb812c32fceed79c03c0234
- https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa
- https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b
- https://launchpad.net/bugs/cve/CVE-2021-46966
- https://git.kernel.org/linus/e483bb9a991bdae29a0caa4b3a6d002c968f94aa
- https://security-tracker.debian.org/tracker/CVE-2021-46966
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-46966
- https://nvd.nist.gov/vuln/detail/CVE-2021-46966
- https://ubuntu.com/security/CVE-2021-46966
Frequently Asked Questions
What is the severity of CVE-2021-46966?
CVE-2021-46966 has a severity rating that indicates a medium impact vulnerability in the Linux kernel.
How do I fix CVE-2021-46966?
To fix CVE-2021-46966, upgrade to the patched versions of the Linux kernel, specifically versions 5.10.223-1, 5.10.226-1, 6.1.123-1, or later.
What systems are affected by CVE-2021-46966?
CVE-2021-46966 affects a variety of Linux kernel versions between 4.4.195 and 5.12.3.
What type of vulnerability is CVE-2021-46966?
CVE-2021-46966 is classified as a use-after-free vulnerability within the Linux kernel.
Is there a workaround for CVE-2021-46966?
There is no recommended workaround for CVE-2021-46966; patching the system is the recommended mitigation.
- agent/title
- agent/weakness
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/author
- agent/references
- agent/severity
- agent/remedy
- agent/description
- agent/event
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/trending
- agent/source
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- collector/nvd-api
- agent/tags
- agent/softwarecombine
- collector/usn-cve
- source/Ubuntu
- collector/security-tracker-debian
- source/Debian
- vendor/linux
- canonical/linux kernel
- version/linux kernel/4.4.195
- version/linux kernel/4.9.195
- version/linux kernel/4.14.147
- version/linux kernel/4.19.77
- version/linux kernel/5.4
- version/linux kernel/5.5
- version/linux kernel/5.11
- version/linux kernel/5.12
- package-manager/debian