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CVE-2024-49960

Estado: ModificadaAlta (7.8)—

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

ext4: fix timer use-after-free on failed mount

Syzbot has found an ODEBUG bug in ext4_fill_super

The del_timer_sync function cancels the s_err_report timer, which reminds about filesystem errors daily. We should guarantee the timer is no longer active before kfree(sbi).

When filesystem mounting fails, the flow goes to failed_mount3, where an error occurs when ext4_stop_mmpd is called, causing a read I/O failure. This triggers the ext4_handle_error function that ultimately re-arms the timer, leaving the s_err_report timer active before kfree(sbi) is called.

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Fix the issue by canceling the s_err_report timer after calling ext4_stop_mmpd.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Use-after-free (CWE-416) en código kernel con privilegios locales (PR:L) permite causar DoS por crash; el timmer desarmado incorrectamente provoca corrupción de memoria en unmount.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix timer use-after-free on failed mount\n\nSyzbot has found an ODEBUG bug in ext4_fill_super\n\nThe del_timer_sync function cancels the s_err_report timer,\nwhich reminds about filesystem errors daily. We should\nguarantee the timer is no longer active before kfree(sbi).\n\nWhen filesystem mounting fails, the flow goes to failed_mount3,\nwhere an error occurs when ext4_stop_mmpd is called, causing\na read I/O failure. This triggers the ext4_handle_error function\nthat ultimately re-arms the timer,\nleaving the s_err_report timer active before kfree(sbi) is called.\n\nFix the issue by canceling the s_err_report timer after calling ext4_stop_mmpd."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: fix timer use-after-free on failed mount Syzbot ha encontrado un error ODEBUG en ext4_fill_super La función del_timer_sync cancela el temporizador s_err_report, que recuerda los errores del sistema de archivos a diario. Debemos garantizar que el temporizador ya no esté activo antes de kfree(sbi). Cuando falla el montaje del sistema de archivos, el flujo va a failed_mount3, donde ocurre un error cuando se llama a ext4_stop_mmpd, lo que causa un error de E/S de lectura. Esto activa la función ext4_handle_error que, en última instancia, vuelve a armar el temporizador, dejando el temporizador s_err_report activo antes de que se llame a kfree(sbi). Solucione el problema cancelando el temporizador s_err_report después de llamar a ext4_stop_mmpd."
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