{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-49960",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-49960"
  ],
  "published": "2024-10-21T18:02:47Z",
  "summary": "ext4: fix timer use-after-free on failed mount",
  "details": "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 We should\nguarantee the timer is no longer active before kfree(sbi).\n\nWhen filesystem mounting fails, the flow goes to failed_mount3,\nwhere an error occurs when ext4_stop_mmpd is called, causing\na read I/O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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    }
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-49960"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7aac0c17a8cdf4a3236991c1e60435c6a984076c"
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      "url": "https://git.kernel.org/stable/c/22e9b83f0f33bc5a7a3181769d1dccbf021f5b04"
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    {
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      "url": "https://git.kernel.org/stable/c/0ce160c5bdb67081a62293028dc85758a8efb22a"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is triggered by mounting a crafted ext4 image via the mount(2)/fsconfig(2) syscall path, which requires local system access to the block device or image file. There is no remote or network-facing entry point into `ext4_fill_super()`.\nAC:L - The attacker fully controls the crafted image: enabling the MMP feature starts kmmpd, and planting a later-stage mount failure plus an unreadable/corrupt MMP block deterministically drives `ext4_stop_mmpd()` \u2192 `ext4_error_err()` \u2192 `mod_timer()` after the timer was already cancelled. syzbot reproduced it reliably; no race or uncontrolled memory-layout condition is involved.\nPR:N - The attacker supplies only a malicious filesystem image or removable device and needs no account on the target; the privileged mount is performed by the victim or by an automounter (udisks2/autofs) acting on their behalf.\nUI:R - Because ext4 is not FS_USERNS_MOUNT, someone with CAP_SYS_ADMIN (or a desktop automount daemon reacting to inserted media) must actually mount the attacker-supplied image for the failed-mount cleanup path to run.\nS:U - The freed `ext4_sb_info` and the stale timer both live in the kernel's own security authority; exploitation yields kernel-level compromise but does not cross a hypervisor, IOMMU, or sandbox boundary.\nC:H - The armed `s_err_report` timer_list points into freed slab memory, so reallocating that object gives the attacker a use-after-free with control over the freed contents, which is leverageable into arbitrary kernel memory disclosure.\nI:H - The stale timer wheel entry is both an hlist_node and a `->function` pointer read out of attacker-reallocatable memory, giving list-corruption write and control-flow-hijack primitives executed from softirq context.\nA:H - The use-after-free reliably produces an ODEBUG/KASAN splat and, in production kernels, timer-wheel corruption leading to an oops or panic when the freed object is reused or the timer expires."
    }
  }
}