erofs: fix buffer copy overflow of ztailpacking feature

{
  "id": "7c23b01f3c620fbb584ad351e6637b7e95e75bc3a3d0f3f0b843f81aeed5b301",
  "url": "https://osv.dev/vulnerability/CVE-2022-49464",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "erofs: fix buffer copy overflow of ztailpacking feature",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: erofs: fix buffer copy overflow of ztailpacking feature I got some KASAN report as below: [ 46.959738] ================================================================== [ 46.960430] BUG: KASAN: use-after-free in z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] Read of size 4074 at addr ffff8880300c2f8e by task fssum/188 ... [ 46.960430] Call Trace: [ 46.960430] [ 46.960430] dump_stack_lvl+0x41/0x5e [ 46.960430] print_report.cold+0xb2/0x6b7 [ 46.960430] ? z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] kasan_report+0x8a/0x140 [ 46.960430] ? z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] kasan_check_range+0x14d/0x1d0 [ 46.960430] memcpy+0x20/0x60 [ 46.960430] z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] z_erofs_decompress_pcluster+0xaae/0x1080 The root cause is that the tail pcluster won't be a complete filesystem block anymore. So if ztailpacking is used, the second part of an uncompressed tail pcluster may not be ``rq->pageofs_out``.",
    "evidence": "osv:CVE-2022-49464",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.17.14",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.18.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-49464",
      "aliases": [
        "CVE-2022-49464"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "ab749badf9f41f32509cd103391b81ea7e684b76"
                },
                {
                  "fixed": "4d53a625f29074e7b8236c2c0e0922edb7608df9"
                },
                {
                  "fixed": "6b59e1907f58cf877c563dcf013159eb9f994b64"
                },
                {
                  "fixed": "dcbe6803fffd387f72b48c2373b5f5ed12a5804b"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49464.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.17.0"
                },
                {
                  "fixed": "5.17.14"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.18.0"
                },
                {
                  "fixed": "5.18.3"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49464.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.308815074Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4d53a625f29074e7b8236c2c0e0922edb7608df9",
        "https://git.kernel.org/stable/c/6b59e1907f58cf877c563dcf013159eb9f994b64",
        "https://git.kernel.org/stable/c/dcbe6803fffd387f72b48c2373b5f5ed12a5804b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49464.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49464",
        "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/2022/49xxx/CVE-2022-49464.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49464",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 522004,
  "published_at": "2025-02-26T02:13:10.321+00:00"
}