{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-97520",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-97520"
  ],
  "published": "2026-09-24T16:08:25Z",
  "summary": "gfs2: move quota_init qc iterator increment",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: move quota_init qc iterator increment\n\nMove qc++ from the loop body into the for-loop increment\nexpression in gfs2_quota_init().\n\nThis keeps iterator progression explicit and avoids mixing pointer\nadvance with duplicate-slot handling in the loop body.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-97520"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/04ec2f3b29b3c8a59950b8816b5ebc8ba052808a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/21a50a9373adab35ffadf5cf59272dc99078170e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/942202677f8f2ee448a6a2feb06aeeaf520342e3"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-28T05:31:34Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The malformed bytes are on-disk struct gfs2_quota_change records in the per-node quota_change file. gfs2_quota_init() reads them via gfs2_meta_ra() from gfs2_get_tree()\u2192get_tree_bdev()\u2192gfs2_fill_super()\u2192gfs2_make_fs_rw(); no NFS/SMB/TCP message carries qc_id or qc_change.\nAC:L - A crafted quota_change file with two non-zero qc_change entries sharing qc_id, the duplicate in the last slot of a QC block, makes the pre-fix body qc++ then memset(qc,0,sizeof(*qc)) run on every read-write mount of that image, with no race.\nPR:N - Crafting the image needs no host account. gfs2_fs_type.fs_flags is only FS_REQUIRES_DEV (no FS_USERNS_MOUNT), so mount_capable() is capable(CAP_SYS_ADMIN) in init_user_ns; that privileged mount of the attacker image is scored as UI:R, not attacker privilege.\nUI:R - gfs2_quota_init() runs only from gfs2_make_fs_rw() after gfs2_fill_super() or gfs2_reconfigure() attaches the attacker-supplied block device. Because gfs2 is not FS_USERNS_MOUNT, a victim or administrator must mount that image read-write before the duplicate-slot memset runs.\nS:U - The out-of-bounds memset in gfs2_quota_init() corrupts page-cache memory in the host kernel that mounted the volume; this is not a KVM/Xen guest-to-host escape or an IOMMU/DMA bypass.\nC:N - The duplicate path only stores 16 zeros through the already-advanced qc pointer; it does not load adjacent kernel bytes or copy them to userspace.\nI:H - Pre-fix, qc++ runs before memset(qc,0,sizeof(*qc)). sd_qc_per_block is (sb_bsize-24)/16, leaving 8 bytes of padding, so a last-slot duplicate stores 8 zeros past bh->b_data+sb_bsize of the gfs2_getbuf() buffer_head: a kernel out-of-bounds write.\nA:H - Those 8 zeros past the QC buffer_head land in the next folio/page (or the next BH in the same folio when sb_bsize<PAGE_SIZE) and can oops the kernel when that memory is live, poisoned, or KASAN-guarded."
    }
  }
}