ubifs: Fix memory leak in alloc_wbufs()

{
  "id": "acd7b30fad3d32686acc1759c904c44b60ba660f06765943d2fe3395470ac8bd",
  "url": "https://osv.dev/vulnerability/CVE-2023-53468",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ubifs: Fix memory leak in alloc_wbufs()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ubifs: Fix memory leak in alloc_wbufs() kmemleak reported a sequence of memory leaks, and show them as following: unreferenced object 0xffff8881575f8400 (size 1024): comm \"mount\", pid 19625, jiffies 4297119604 (age 20.383s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [] __kmalloc+0x4d/0x150 [] ubifs_mount+0x307b/0x7170 [ubifs] [] legacy_get_tree+0xed/0x1d0 [] vfs_get_tree+0x7d/0x230 [] path_mount+0xdd4/0x17b0 [] __x64_sys_mount+0x1fa/0x270 [] do_syscall_64+0x35/0x80 [] entry_SYSCALL_64_after_hwframe+0x46/0xb0 unreferenced object 0xffff8881798a6e00 (size 512): comm \"mount\", pid 19677, jiffies 4297121912 (age 37.816s) hex dump (first 32 bytes): 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk backtrace: [] __kmalloc+0x4d/0x150 [] ubifs_wbuf_init+0x52/0x480 [ubifs] [] ubifs_mount+0x31f5/0x7170 [ubifs] [] legacy_get_tree+0xed/0x1d0 [] vfs_get_tree+0x7d/0x230 [] path_mount+0xdd4/0x17b0 [] __x64_sys_mount+0x1fa/0x270 [] do_syscall_64+0x35/0x80 [] entry_SYSCALL_64_after_hwframe+0x46/0xb0 The problem is that the ubifs_wbuf_init() returns an error in the loop which in the alloc_wbufs(), then the wbuf->buf and wbuf->inodes that were successfully alloced before are not freed. Fix it by adding error hanging path in allo",
    "evidence": "osv:CVE-2023-53468",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.235",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.173",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.100",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.18",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-53468",
      "aliases": [
        "CVE-2023-53468"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d"
                },
                {
                  "fixed": "1f206002c6bc302bface871ef3f72c0bbcaa931c"
                },
                {
                  "fixed": "bf50229494f0443b3f08427d7df63e5a7e2a796a"
                },
                {
                  "fixed": "3e29634eb56e6547272fe4e568f63421f8b3b9fa"
                },
                {
                  "fixed": "26ec45f1c504e15268383019df139d7983f1e67f"
                },
                {
                  "fixed": "e11f36d3bc4d23f620754a948fe7b82b63dcb185"
                },
                {
                  "fixed": "4a1ff3c5d04b9079b4f768d9a71b51c4af578dd2"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53468.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.27"
                },
                {
                  "fixed": "5.4.235"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.173"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.100"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.18"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53468.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.046645634Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1f206002c6bc302bface871ef3f72c0bbcaa931c",
        "https://git.kernel.org/stable/c/26ec45f1c504e15268383019df139d7983f1e67f",
        "https://git.kernel.org/stable/c/3e29634eb56e6547272fe4e568f63421f8b3b9fa",
        "https://git.kernel.org/stable/c/4a1ff3c5d04b9079b4f768d9a71b51c4af578dd2",
        "https://git.kernel.org/stable/c/bf50229494f0443b3f08427d7df63e5a7e2a796a",
        "https://git.kernel.org/stable/c/e11f36d3bc4d23f620754a948fe7b82b63dcb185",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53468.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53468",
        "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/2023/53xxx/CVE-2023-53468.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53468",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 502218,
  "published_at": "2025-10-01T11:42:38.673+00:00"
}