CVE-2024-38580

epoll: be better about file lifetimes

Severity Score

3.3

*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:

epoll: be better about file lifetimes

epoll can call out to vfs_poll() with a file pointer that may race with
the last 'fput()'. That would make f_count go down to zero, and while
the ep->mtx locking means that the resulting file pointer tear-down will
be blocked until the poll returns, it means that f_count is already
dead, and any use of it won't actually get a reference to the file any
more: it's dead regardless.

Make sure we have a valid ref on the file pointer before we call down to
vfs_poll() from the epoll routines.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: epoll: mejore la duración de los archivos epoll puede llamar a vfs_poll() con un puntero de archivo que puede competir con el último 'fput()'. Eso haría que f_count bajara a cero, y aunque el bloqueo ep->mtx significa que el desmontaje del puntero del archivo resultante se bloqueará hasta que regrese la encuesta, significa que f_count ya está muerto y no se podrá utilizar. De hecho, ya no obtengo una referencia al archivo: está muerto de todos modos. Asegúrese de tener una referencia válida en el puntero del archivo antes de llamar a vfs_poll() desde las rutinas de epoll.

A flaw was found in the Linux kernel. Inappropriate file lifetime handling may lead to availability issues.

*Credits: N/A

CVSS Scores

Red Hatv3.1 3.3

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-06-18 CVE Reserved
2024-06-19 CVE Published
2024-06-20 EPSS Updated
2024-09-11 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (7)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/cbfd1088e24ec4c1199756a37cb8e4cd0a4b016e	2024-06-16
https://git.kernel.org/stable/c/559214eb4e5c3d05e69428af2fae2691ba1eb784	2024-06-12
https://git.kernel.org/stable/c/4f65f4defe4e23659275ce5153541cd4f76ce2d2	2024-06-12
https://git.kernel.org/stable/c/16e3182f6322575eb7c12e728ad3c7986a189d5d	2024-05-30
https://git.kernel.org/stable/c/4efaa5acf0a1d2b5947f98abb3acf8bfd966422b	2024-05-05

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2024-38580	2024-07-31
https://bugzilla.redhat.com/show_bug.cgi?id=2293412	2024-07-31

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"				< 5.15.161 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.161"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.1.93 Search vendor "Linux" for product "Linux Kernel" and version " < 6.1.93"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.6.33 Search vendor "Linux" for product "Linux Kernel" and version " < 6.6.33"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.8.12 Search vendor "Linux" for product "Linux Kernel" and version " < 6.8.12"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.9 Search vendor "Linux" for product "Linux Kernel" and version " < 6.9"		en		Affected