CVE-2024-35793

debugfs: fix wait/cancellation handling during remove

Severity Score

"-"

*CVSS v-

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:

debugfs: fix wait/cancellation handling during remove

Ben Greear further reports deadlocks during concurrent debugfs
remove while files are being accessed, even though the code in
question now uses debugfs cancellations. Turns out that despite
all the review on the locking, we missed completely that the
logic is wrong: if the refcount hits zero we can finish (and
need not wait for the completion), but if it doesn't we have
to trigger all the cancellations. As written, we can _never_
get into the loop triggering the cancellations. Fix this, and
explain it better while at it.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: debugfs: corrige el manejo de espera/cancelación durante la eliminación Ben Greear informa además bloqueos durante la eliminación de debugfs concurrentes mientras se accede a los archivos, aunque el código en cuestión ahora usa cancelaciones de debugfs. Resulta que a pesar de toda la revisión sobre el bloqueo, no entendimos por completo que la lógica es incorrecta: si el recuento llega a cero, podemos finalizar (y no necesitamos esperar a que se complete), pero si no es así, tenemos que activar todos los cancelaciones. Tal como está escrito, _nunca_ podemos entrar en el ciclo que desencadena las cancelaciones. Arregla esto y explícalo mejor mientras lo haces.

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-05-17 CVE Reserved
2024-05-17 CVE Published
2024-05-18 EPSS Updated
2024-09-11 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (4)

URL	Tag	Source
https://git.kernel.org/stable/c/8c88a474357ead632b07c70bf7f119ace8c3b39e	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/e88b5ae01901c4a655a53158397746334778a57b	2024-04-03
https://git.kernel.org/stable/c/3d08cca5fd0aabb62b7015067ab40913b33da906	2024-04-03
https://git.kernel.org/stable/c/952c3fce297f12c7ff59380adb66b564e2bc9b64	2024-03-07

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"				>= 6.7 < 6.7.12 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.7 < 6.7.12"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.7 < 6.8.3 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.7 < 6.8.3"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.7 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.7 < 6.9"		en		Affected