CVE-2021-46966

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. 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. 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.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394 Patch
https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203 Patch
https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b Patch
https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9be Patch
https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23 Patch
https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17 Patch
https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234 Patch
https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa Patch
https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b Patch
https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394 Patch
https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203 Patch
https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b Patch
https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9be Patch
https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23 Patch
https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17 Patch
https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234 Patch
https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa Patch
https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

06 Dec 2024, 17:55

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
References () https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394 - () https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394 - Patch
References () https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203 - () https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203 - Patch
References () https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b - () https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b - Patch
References () https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9be - () https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9be - Patch
References () https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23 - () https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23 - Patch
References () https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17 - () https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17 - Patch
References () https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234 - () https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234 - Patch
References () https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa - () https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa - Patch
References () https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b - () https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
CWE CWE-416

21 Nov 2024, 06:35

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394 - () https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394 -
References () https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203 - () https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203 -
References () https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b - () https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b -
References () https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9be - () https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9be -
References () https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23 - () https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23 -
References () https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17 - () https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17 -
References () https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234 - () https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234 -
References () https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa - () https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa -
References () https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b - () https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b -

28 Feb 2024, 14:06

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ACPI: custom_method: soluciona un posible problema de use-after-free En cm_write(), buf siempre se libera al llegar al final de la función. Si el recuento solicitado es menor que table.length, el búfer asignado se liberará, pero las llamadas posteriores a cm_write() seguirán intentando acceder a él. Elimine el kfree(buf) incondicional al final de la función y establezca el buf en NULL en la ruta de error -EINVAL para que coincida con el resto de la función.

27 Feb 2024, 19:04

Type Values Removed Values Added
New CVE
Information

Published : 2024-02-27 19:04

Updated : 2024-12-06 17:55

NVD link : CVE-2021-46966

Mitre link : CVE-2021-46966

CVE.ORG link : CVE-2021-46966

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free