{
  "cveId": "CVE-2026-97926",
  "url": "https://patchblox.com/security/cve/CVE-2026-97926",
  "summary": "CVE-2026-97926 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2026-97926, released September 29, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ufs: validate cylinder group metadata before caching it",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ufs: validate cylinder group metadata before caching it  ufs_read_cylinder() copies the cylinder group index and the rotor positions straight from the on-disk group and caches them without any check:  \tucpi-\u003Ec_cgx    = fs32_to_cpu(sb, ucg-\u003Ecg_cgx); \tucpi-\u003Ec_rotor  = fs32_to_cpu(sb, ucg-\u003Ecg_rotor); \tucpi-\u003Ec_frotor = fs32_to_cpu(sb, ucg-\u003Ecg_frotor); \tucpi-\u003Ec_irotor = fs32_to_cpu(sb, ucg-\u003Ecg_irotor);  They are then used as indices during allocation and free:    - c_cgx indexes the cylinder summary array as     UFS_SB(sb)-\u003Efs_cs(ucpi-\u003Ec_cgx), so a value past s_ncg writes a 32     bit count outside the s_csp allocation.    - c_frotor becomes a bitmap scan start, start = c_frotor \u003E\u003E 3, and     then length = ((s_fpg \u002B 7) \u003E\u003E 3) - start. A start beyond the block     bitmap wraps the unsigned length to a huge value, so ubh_scanc()     walks far past the cylinder group buffers. c_irotor drives the     inode bitmap the same way.  A crafted image can set any of these freely, turning an ordinary allocation into an out of bounds access.  Reject a cylinder group whose recorded index does not match the group being read, or whose rotors fall outside the group, before the metadata is cached. Valid filesystems keep cg_cgx equal to the group number and the rotors within the group, so only malformed images are rejected.",
  "published": "2026-09-25T11:17:19Z",
  "severity": "Moderate",
  "cvss": 7,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "epss": 0.00152,
  "epssPercentile": 0.04329,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97926",
  "fixes": [
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.90.1",
      "fix": "SUSE-SU-2026:5091-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "kernel-azure",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.90.1",
      "fix": "SUSE-SU-2026:5091-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "kernel-default",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.90.1",
      "fix": "SUSE-SU-2026:5091-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "kernel-default-base",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.90.1.150700.17.51.1",
      "fix": "SUSE-SU-2026:5091-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "kernel-docs",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.90.1",
      "fix": "SUSE-SU-2026:5091-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-SLE15-SP7_Update_24",
      "release": "sles 15.7",
      "fixedVersion": "1-150700.15.3.1",
      "fix": "SUSE-SU-2026:5091-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "kernel-obs-build",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.90.1",
      "fix": "SUSE-SU-2026:5091-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "kernel-source",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.90.1",
      "fix": "SUSE-SU-2026:5091-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "kernel-syms",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.90.1",
      "fix": "SUSE-SU-2026:5091-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "kernel-zfcpdump",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.90.1",
      "fix": "SUSE-SU-2026:5091-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.190-1",
      "fix": "DEBIAN-CVE-2026-97926",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-97926",
      "released": "2026-09-29T20:26:41Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-97926",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-97926",
      "released": "2026-09-29T20:26:41Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.7-1",
      "fix": "DEBIAN-CVE-2026-97926",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-97926",
      "released": "2026-09-29T20:26:41Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.111-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-97926",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-97926",
      "released": "2026-09-29T20:26:41Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-10T01:44:33Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}