{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "671889c553ea55e2da6a4f3b15f4c0fa40f2f0d1",
              "status": "affected",
              "version": "dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8",
              "versionType": "git"
            },
            {
              "lessThan": "858aa4965ffa8c0d4bb5dd835ac4f1c9a1dcab85",
              "status": "affected",
              "version": "dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8",
              "versionType": "git"
            },
            {
              "lessThan": "452a8467be8143747292218212671deeb186d2ae",
              "status": "affected",
              "version": "dcd0538ff4e854fa9d7f4630b359ca8fdb5cb5a8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
            {
              "lessThan": "2.6.22",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix UBSAN array-index-out-of-bounds in ocfs2_sum_rightmost_rec\n\n[BUG]\nOn-disk corruption setting l_next_free_rec to 0 in an inode\u0027s embedded\nextent list triggers a UBSAN panic on the next write to that file.\n\n[CAUSE]\nocfs2_sum_rightmost_rec() computes\ni = le16_to_cpu(el-\u003el_next_free_rec) - 1\nand accesses el-\u003el_recs[i] without validating i. When l_next_free_rec\nis 0, i becomes -1; when l_next_free_rec exceeds l_count, i falls\npast the end of the array. Either case violates the\n__counted_by_le(l_count) annotation on l_recs[] and triggers UBSAN.\n\n[FIX]\nValidate the inode\u0027s embedded extent list when the inode is read, in\nocfs2_validate_inode_block(): l_count must be non-zero and no larger\nthan the inode block can hold, and l_next_free_rec must not exceed\nl_count. A corrupt list is rejected at read time, before the b-tree\ncode can index l_recs[] out of bounds."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only via local VFS write paths on a mounted OCFS2 volume (write/mmap extending allocation), not from network packet handling or remote protocols; exploitation requires local syscall access to a mounted filesystem.\nAC:L - An attacker can reliably craft on-disk inode metadata (e.g., l_next_free_rec=0) in an OCFS2 image and trigger btree growth with a normal extending write; syzkaller reproduced this deterministically without races or victim-specific timing.\nPR:L - Full exploitation requires mounting a crafted OCFS2 image and writing to it; CAP_SYS_ADMIN for mount/loop setup is obtainable by an unprivileged user via user namespaces, matching the low-privilege bar used for comparable OCFS2 corruption CVEs.\nUI:N - No victim interaction is required when the attacker crafts the corrupt image, mounts it (including via user namespace), and performs the triggering write themselves; no third party must open files or take other actions.\nS:U - Impact is confined to kernel memory/filesystem integrity on the host processing the corrupt OCFS2 metadata; it does not cross VM, container, or IOMMU security boundaries into another authority.\nC:H - The flaw is an out-of-bounds read of extent records from attacker-controlled on-disk fields; even when UBSAN traps, the invalid index access can expose adjacent inode metadata and is classed as information-disclosure-capable memory corruption.\nI:H - The out-of-bounds sum feeds btree growth/shift logic that writes derived cluster counts and tree pointers back to disk, enabling attacker-influenced metadata corruption beyond the immediate read primitive.\nA:H - On UBSAN-enabled kernels the invalid array index triggers a kernel panic on write; even without UBSAN, corrupt btree updates from the bad sum can crash or destabilize the system, satisfying high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T06:56:14.095Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/671889c553ea55e2da6a4f3b15f4c0fa40f2f0d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/858aa4965ffa8c0d4bb5dd835ac4f1c9a1dcab85"
        },
        {
          "url": "https://git.kernel.org/stable/c/452a8467be8143747292218212671deeb186d2ae"
        }
      ],
      "title": "ocfs2: fix UBSAN array-index-out-of-bounds in ocfs2_sum_rightmost_rec",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72162",
    "datePublished": "2026-08-15T05:53:30.420Z",
    "dateReserved": "2026-08-09T03:40:39.909Z",
    "dateUpdated": "2026-08-18T06:56:14.095Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}