CVE-2021-47276

In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ftrace_bug() It was reported that a bug on arm64 caused a bad ip address to be used for updating into a nop in ftrace_init(), but the error path (rightfully) returned -EINVAL and not -EFAULT, as the bug caused more than one error to occur. But because -EINVAL was returned, the ftrace_bug() tried to report what was at the location of the ip address, and read it directly. This caused the machine to panic, as the ip was not pointing to a valid memory address. Instead, read the ip address with copy_from_kernel_nofault() to safely access the memory, and if it faults, report that the address faulted, otherwise report what was in that location.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28	Patch
https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875	Patch
https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b	Patch
https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051	Patch
https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2	Patch
https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb	Patch
https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81	Patch
https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7	Patch
https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28	Patch
https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875	Patch
https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b	Patch
https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051	Patch
https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2	Patch
https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb	Patch
https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81	Patch
https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7	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:5.13:rc1::::::
	cpe:2.3:o:linux:linux_kernel:5.13:rc2::::::
	cpe:2.3:o:linux:linux_kernel:5.13:rc3::::::
	cpe:2.3:o:linux:linux_kernel:5.13:rc4::::::
	cpe:2.3:o:linux:linux_kernel:5.13:rc5::::::

History

30 Apr 2025, 14:46

Type	Values Removed	Values Added
First Time		Linux linux Kernel Linux
CPE		cpe:2.3:o:linux:linux_kernel:5.13:rc4:::::: cpe:2.3:o:linux:linux_kernel:5.13:rc1:::::: cpe:2.3:o:linux:linux_kernel:5.13:rc5:::::: cpe:2.3:o:linux:linux_kernel:5.13:rc2:::::: cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:5.13:rc3::::::
CWE		CWE-706
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.5
References	~~() https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 -~~	() https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 - Patch
References	~~() https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 -~~	() https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 - Patch
References	~~() https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b -~~	() https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b - Patch
References	~~() https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 -~~	() https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 - Patch
References	~~() https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 -~~	() https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 - Patch
References	~~() https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb -~~	() https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb - Patch
References	~~() https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 -~~	() https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 - Patch
References	~~() https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 -~~	() https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 - Patch

21 Nov 2024, 06:35

Type	Values Removed	Values Added
References	~~() https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 -~~	() https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 -
References	~~() https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 -~~	() https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 -
References	~~() https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b -~~	() https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b -
References	~~() https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 -~~	() https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 -
References	~~() https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 -~~	() https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 -
References	~~() https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb -~~	() https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb -
References	~~() https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 -~~	() https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 -
References	~~() https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 -~~	() https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 -
Summary		(es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ftrace: no lea ciegamente la dirección IP en ftrace_bug(). Se informó que un error en arm64 provocó que se usara una dirección IP incorrecta para actualizar a un nop en ftrace_init() , pero la ruta de error (con razón) devolvió -EINVAL y no -EFAULT, ya que el error provocó que ocurriera más de un error. Pero debido a que se devolvió -EINVAL, ftrace_bug() intentó informar qué había en la ubicación de la dirección IP y leerlo directamente. Esto provocó que la máquina entrara en pánico, ya que la IP no apuntaba a una dirección de memoria válida. En su lugar, lea la dirección IP con copy_from_kernel_nofault() para acceder de forma segura a la memoria y, si falla, informe que la dirección falló; de lo contrario, informe qué había en esa ubicación.

21 May 2024, 15:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2024-05-21 15:15

Updated : 2025-04-30 14:46

NVD link : CVE-2021-47276

Mitre link : CVE-2021-47276

CVE.ORG link : CVE-2021-47276

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-706

Use of Incorrectly-Resolved Name or Reference

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But because -EINVAL was returned, the ftrace_bug() tried to report\nwhat was at the location of the ip address, and read it directly. This\ncaused the machine to panic, as the ip was not pointing to a valid memory\naddress.\n\nInstead, read the ip address with copy_from_kernel_nofault() to safely\naccess the memory, and if it faults, report that the address faulted,\notherwise report what was in that location."}, {"lang": "es", "value": " En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ftrace: no lea ciegamente la direcci\u00f3n IP en ftrace_bug(). Se inform\u00f3 que un error en arm64 provoc\u00f3 que se usara una direcci\u00f3n IP incorrecta para actualizar a un nop en ftrace_init() , pero la ruta de error (con raz\u00f3n) devolvi\u00f3 -EINVAL y no -EFAULT, ya que el error provoc\u00f3 que ocurriera m\u00e1s de un error. Pero debido a que se devolvi\u00f3 -EINVAL, ftrace_bug() intent\u00f3 informar qu\u00e9 hab\u00eda en la ubicaci\u00f3n de la direcci\u00f3n IP y leerlo directamente. Esto provoc\u00f3 que la m\u00e1quina entrara en p\u00e1nico, ya que la IP no apuntaba a una direcci\u00f3n de memoria v\u00e1lida. En su lugar, lea la direcci\u00f3n IP con copy_from_kernel_nofault() para acceder de forma segura a la memoria y, si falla, informe que la direcci\u00f3n fall\u00f3; de lo contrario, informe qu\u00e9 hab\u00eda en esa ubicaci\u00f3n."}], "lastModified": "2025-04-30T14:46:07.833", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "224F5847-99C4-401E-A5D6-712A45CC534F", "versionEndExcluding": "4.4.273", "versionStartIncluding": "2.6.28"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "484D222B-5082-4E28-BF0F-B52766353015", "versionEndExcluding": "4.9.273", "versionStartIncluding": "4.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "83CDDAD5-5539-46C9-9255-C1DAC38F7905", "versionEndExcluding": "4.14.237", "versionStartIncluding": "4.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "23EECCE9-4D4C-4684-AB00-10C938F5DDC1", "versionEndExcluding": "4.19.195", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "876275F9-BEC7-40E8-9D7F-A20729A4A4FF", "versionEndExcluding": "5.4.126", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DA547B08-9D25-467B-AD0D-8460FE4EE70D", "versionEndExcluding": "5.10.44", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F914A757-FAFD-407E-9031-21F66635D5EA", "versionEndExcluding": "5.12.11", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "96AC23B2-D46A-49D9-8203-8E1BEDCA8532"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DA610E30-717C-4700-9F77-A3C9244F3BFD"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1ECD33F5-85BE-430B-8F86-8D7BD560311D"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CF351855-2437-4CF5-AD7C-BDFA51F27683"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}

5.5 /10