CVE-2021-47259

NFS: Fix use-after-free in nfs4_init_client()

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved:

NFS: Fix use-after-free in nfs4_init_client()

KASAN reports a use-after-free when attempting to mount two different
exports through two different NICs that belong to the same server.

Olga was able to hit this with kernels starting somewhere between 5.7
and 5.10, but I traced the patch that introduced the clear_bit() call to
4.13. So something must have changed in the refcounting of the clp
pointer to make this call to nfs_put_client() the very last one.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: core: corrige el manejo de errores de scsi_host_alloc(). Después de que el dispositivo se inicializa mediante device_initialize(), o su nombre se establece mediante dev_set_name(), el dispositivo debe liberarse mediante put_device (). De lo contrario, se filtrará el nombre del dispositivo porque se asigna dinámicamente en dev_set_name(). Solucione la fuga reemplazando kfree() con put_device(). Dado que scsi_host_dev_release() maneja adecuadamente la eliminación de IDA y kthread, elimine también estas mayúsculas y minúsculas especiales del manejo de errores.

*Credits: N/A

CVSS Scores

CISAv3.1 7.5

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

None

Automatable

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2024-05-21 CVE Reserved
2024-05-21 CVE Published
2024-05-22 EPSS Updated
2024-11-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-416: Use After Free

CAPEC

References (7)

URL	Tag	Source
https://git.kernel.org/stable/c/8dcbec6d20eb881ba368d0aebc3a8a678aebb1da	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/c7eab9e2d7b4e983ce280276fb920af649955897	2021-06-16
https://git.kernel.org/stable/c/42c10b0db064e45f5c5ae7019bbf2168ffab766c	2021-06-16
https://git.kernel.org/stable/c/3e3c7ebbfac152d08be75c92802a64a1f6471a15	2021-06-16
https://git.kernel.org/stable/c/c3b6cf64dfe4ef96e7341508d50d6998da7062c7	2021-06-16
https://git.kernel.org/stable/c/72651c6579a25317a90536181d311c663d0329ab	2021-06-16
https://git.kernel.org/stable/c/476bdb04c501fc64bf3b8464ffddefc8dbe01577	2021-06-03

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.13 < 4.14.237 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.13 < 4.14.237"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.13 < 4.19.195 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.13 < 4.19.195"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.13 < 5.4.126 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.13 < 5.4.126"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.13 < 5.10.44 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.13 < 5.10.44"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.13 < 5.12.11 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.13 < 5.12.11"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.13 < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.13 < 5.13"		en		Affected