CVE-2024-49957

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix null-ptr-deref when journal load failed. During the mounting process, if journal_reset() fails because of too short journal, then lead to jbd2_journal_load() fails with NULL j_sb_buffer. Subsequently, ocfs2_journal_shutdown() calls jbd2_journal_flush()->jbd2_cleanup_journal_tail()-> __jbd2_update_log_tail()->jbd2_journal_update_sb_log_tail() ->lock_buffer(journal->j_sb_buffer), resulting in a null-pointer dereference error. To resolve this issue, we should check the JBD2_LOADED flag to ensure the journal was properly loaded. Additionally, use journal instead of osb->journal directly to simplify the code.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

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/387bf565cc03e2e8c720b8b4798efea4aacb6962	Patch
https://git.kernel.org/stable/c/5784d9fcfd43bd853654bb80c87ef293b9e8e80a	Patch
https://git.kernel.org/stable/c/703b2c7e0798d263154dc8593dc2345f75dc077f
https://git.kernel.org/stable/c/82dfdd1e31e774578f76ce6dc90c834f96403a0f	Patch
https://git.kernel.org/stable/c/86a89e75e9e4dfa768b97db466ad6bedf2e7ea5b	Patch
https://git.kernel.org/stable/c/bf605ae98dab5c15c5b631d4d7f88898cb41b649	Patch
https://git.kernel.org/stable/c/f60e94a83db799bde625ac8671a5b4a6354e7120	Patch
https://git.kernel.org/stable/c/fd89d92c1140cee8f59de336cb37fa65e359c123
https://git.kernel.org/stable/c/ff55291fb36779819211b596da703389135f5b05	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::::::::

History

No history.

Information

Published : 2024-10-21 18:15

Updated : 2024-11-08 16:15

NVD link : CVE-2024-49957

Mitre link : CVE-2024-49957

CVE.ORG link : CVE-2024-49957

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-476

NULL Pointer Dereference

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Additionally, use journal instead of\nosb->journal directly to simplify the code."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ocfs2: se corrige el error null-ptr-deref cuando falla la carga del diario. Durante el proceso de montaje, si journal_reset() falla debido a que el diario es demasiado corto, entonces provoca que jbd2_journal_load() falle con j_sb_buffer NULL. Posteriormente, ocfs2_journal_shutdown() llama a jbd2_journal_flush()->jbd2_cleanup_journal_tail()-> __jbd2_update_log_tail()->jbd2_journal_update_sb_log_tail() ->lock_buffer(journal->j_sb_buffer), lo que da como resultado un error de desreferencia de puntero nulo. Para resolver este problema, debemos verificar el indicador JBD2_LOADED para asegurarnos de que el diario se carg\u00f3 correctamente. 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