CVE-2024-26878

quota: Fix potential NULL pointer dereference

Severity Score

5.5

*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:

quota: Fix potential NULL pointer dereference

Below race may cause NULL pointer dereference

P1 P2
dquot_free_inode quota_off
drop_dquot_ref
remove_dquot_ref
dquots = i_dquot(inode)
dquots = i_dquot(inode)
srcu_read_lock
dquots[cnt]) != NULL (1)
dquots[type] = NULL (2)
spin_lock(&dquots[cnt]->dq_dqb_lock) (3)
....

If dquot_free_inode(or other routines) checks inode's quota pointers (1)
before quota_off sets it to NULL(2) and use it (3) after that, NULL pointer
dereference will be triggered.

So let's fix it by using a temporary pointer to avoid this issue.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cuota: corrige una posible desreferencia del puntero NULL La siguiente carrera puede causar una desreferencia del puntero NULL P1 P2 dquot_free_inode quote_off drop_dquot_ref remove_dquot_ref dquots = i_dquot(inode) dquots = i_dquot(inode) srcu_read_lock dquots[cnt]) != NULL (1) dquots[tipo] = NULL (2) spin_lock(&dquots[cnt]->dq_dqb_lock) (3) .... Si dquot_free_inode(u otras rutinas) verifica los punteros de cuota del inodo (1) antes de que cuota_off lo establezca a NULL(2) y usarlo (3) después de eso, se activará la desreferencia del puntero NULL. Entonces, solucionémoslo usando un puntero temporal para evitar este problema.

*Credits: N/A

CVSS Scores

Red Hatv3.1 5.5

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-02-19 CVE Reserved
2024-04-17 CVE Published
2024-04-18 EPSS Updated
2024-09-11 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (13)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/8514899c1a4edf802f03c408db901063aa3f05a1	2024-03-26
https://git.kernel.org/stable/c/49669f8e7eb053f91d239df7b1bfb4500255a9d0	2024-03-26
https://git.kernel.org/stable/c/61380537aa6dd32d8a723d98b8f1bd1b11d8fee0	2024-03-26
https://git.kernel.org/stable/c/1ca72a3de915f87232c9a4cb9bebbd3af8ed3e25	2024-03-26
https://git.kernel.org/stable/c/7f9e833fc0f9b47be503af012eb5903086939754	2024-03-26
https://git.kernel.org/stable/c/40a673b4b07efd6f74ff3ab60f38b26aa91ee5d5	2024-03-26
https://git.kernel.org/stable/c/f2649d98aa9ca8623149b3cb8df00c944f5655c7	2024-03-26
https://git.kernel.org/stable/c/6afc9f4434fa8063aa768c2bf5bf98583aee0877	2024-03-26
https://git.kernel.org/stable/c/d0aa72604fbd80c8aabb46eda00535ed35570f1f	2024-02-05

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2024-26878	2024-08-08
https://bugzilla.redhat.com/show_bug.cgi?id=2275694	2024-08-08

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"				< 4.19.311 Search vendor "Linux" for product "Linux Kernel" and version " < 4.19.311"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.4.273 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.273"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.10.214 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.214"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.15.153 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.153"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.1.83 Search vendor "Linux" for product "Linux Kernel" and version " < 6.1.83"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.6.23 Search vendor "Linux" for product "Linux Kernel" and version " < 6.6.23"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.7.11 Search vendor "Linux" for product "Linux Kernel" and version " < 6.7.11"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.8.2 Search vendor "Linux" for product "Linux Kernel" and version " < 6.8.2"		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