ocfs2: always run deallocs on copy-on-write completion

{
  "id": "401c1d97f71d2726c1db26a80df96e4370972e2a9729d9ff366b2a4b73980416",
  "url": "https://osv.dev/vulnerability/CVE-2026-89496",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ocfs2: always run deallocs on copy-on-write completion",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ocfs2: always run deallocs on copy-on-write completion Local fuzzing of 6.12.94 has found the following memory leak caused by doing 'copy_file_range()' within the same filesystem: unreferenced object 0xffff88812192c980 (size 32): comm \"syz.0.49\", pid 12095, jiffies 4294964143 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 ................ c0 c5 92 21 81 88 ff ff 00 02 00 00 00 06 00 00 ...!............ backtrace (crc 7068d63f): kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline] slab_post_alloc_hook mm/slub.c:4152 [inline] slab_alloc_node mm/slub.c:4197 [inline] __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358 kmalloc_noprof include/linux/slab.h:878 [inline] ocfs2_find_per_slot_free_list fs/ocfs2/alloc.c:6618 [inline] ocfs2_cache_block_dealloc+0x155/0x4b0 fs/ocfs2/alloc.c:6786 ocfs2_cache_extent_block_free fs/ocfs2/alloc.c:6819 [inline] ocfs2_unlink_path+0x286/0x450 fs/ocfs2/alloc.c:2613 ocfs2_rotate_subtree_left fs/ocfs2/alloc.c:2779 [inline] __ocfs2_rotate_tree_left+0x1f6f/0x2da0 fs/ocfs2/alloc.c:2985 ocfs2_rotate_tree_left+0x283/0xe00 fs/ocfs2/alloc.c:3237 ocfs2_try_to_merge_extent+0xf56/0x1a20 fs/ocfs2/alloc.c:3825 ocfs2_split_extent+0x15f4/0x2940 fs/ocfs2/alloc.c:5138 ocfs2_clear_ext_refcount+0x2f6/0x550 fs/ocfs2/refcounttree.c:3098 ocfs2_replace_clusters fs/ocfs2/refcounttree.c:3131 [inline] ocfs2_make_clusters_writable fs/ocfs2/refcounttree.c:3255 [inline] ocfs2_r",
    "evidence": "osv:CVE-2026-89496",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.270",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.109",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89496",
      "aliases": [
        "CVE-2026-89496"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "5ff30f07def6d0e6edacf47952807b5ff60f3af6"
                },
                {
                  "fixed": "2753e12853ed2023555cec2c5fe22fbaabb2c0b7"
                },
                {
                  "fixed": "f0261b3aca027f5c409a402ea22f6982750f911c"
                },
                {
                  "fixed": "a4adaa722977f46511d4247172cd4ec991b80ff2"
                },
                {
                  "fixed": "123c050eb96aae0bab74c9f06c6ad3de7992722b"
                },
                {
                  "fixed": "71f07b7f90b3109c9098d1b9c8efbbeece5deb8a"
                },
                {
                  "fixed": "09e93a60e18e83a630ff84ae00cb564bab96ab1f"
                },
                {
                  "fixed": "82ea9d4fc05fb7a387db547c6a7c0aa6a3719616"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89496.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.32"
                },
                {
                  "fixed": "5.10.270"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.221"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.188"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.157"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.109"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.50"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89496.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:44.524727020Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/09e93a60e18e83a630ff84ae00cb564bab96ab1f",
        "https://git.kernel.org/stable/c/123c050eb96aae0bab74c9f06c6ad3de7992722b",
        "https://git.kernel.org/stable/c/2753e12853ed2023555cec2c5fe22fbaabb2c0b7",
        "https://git.kernel.org/stable/c/5ff30f07def6d0e6edacf47952807b5ff60f3af6",
        "https://git.kernel.org/stable/c/71f07b7f90b3109c9098d1b9c8efbbeece5deb8a",
        "https://git.kernel.org/stable/c/82ea9d4fc05fb7a387db547c6a7c0aa6a3719616",
        "https://git.kernel.org/stable/c/a4adaa722977f46511d4247172cd4ec991b80ff2",
        "https://git.kernel.org/stable/c/f0261b3aca027f5c409a402ea22f6982750f911c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89496.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89496",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89496.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89496",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 512514,
  "published_at": "2026-09-11T19:43:46.772+00:00"
}