{"api_version":"1","generated_at":"2026-07-04T08:54:43+00:00","cve":"CVE-2024-49960","urls":{"html":"https://cve.report/CVE-2024-49960","api":"https://cve.report/api/cve/CVE-2024-49960.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2024-49960","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-49960"},"summary":{"title":"ext4: fix timer use-after-free on failed mount","description":"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 We should\nguarantee the timer is no longer active before kfree(sbi).\n\nWhen filesystem mounting fails, the flow goes to failed_mount3,\nwhere an error occurs when ext4_stop_mmpd is called, causing\na read I/O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.","state":"PUBLISHED","assigner":"Linux","published_at":"2024-10-21 18:15:17","updated_at":"2026-06-15 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We should\nguarantee the timer is no longer active before kfree(sbi).\n\nWhen filesystem mounting fails, the flow goes to failed_mount3,\nwhere an error occurs when ext4_stop_mmpd is called, causing\na read I/O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.","Type":"Description","Title":"ext4: fix timer use-after-free on failed mount"}]}}}