ocfs2: validate inline xattrs during inode block validation

{
  "id": "1a785ad379936f80c10f3f1dcb48ce104c05cc00607c4153617f3763a5222756",
  "url": "https://osv.dev/vulnerability/CVE-2026-90321",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ocfs2: validate inline xattrs during inode block validation",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate inline xattrs during inode block validation Patch series \"ocfs2: validate xattr entry bounds\", v7. This series validates OCFS2 xattr entry name/value bounds when xattr metadata is read and validated, before getxattr() or listxattr() can walk out-of-range entry arrays or offsets from corrupted metadata. This patch (of 2): ocfs2_validate_inode_block() verifies a dinode before OCFS2 users walk metadata from it, but inline xattr metadata is still checked only in operation-specific consumers. The existing ibody lookup helper validates inline header placement and entry count, but inode block validation does not reject entry name/value bounds. Add a flat xattr entry validator and call it from inode block validation for inline xattrs. Keep the operation paths on their existing header/count lookup checks; the full entry bounds check now runs when the inode block is validated at read time. Reject corrupted inline xattr metadata before ocfs2_xattr_ibody_get() or listxattr() can walk past the inline storage. Validation reproduced this kernel report: BUG: KASAN: use-after-free in ocfs2_xattr_find_entry+0x5a/0x170 Read of size 2 at addr ffff8881242a2000 by task python3/529 Call Trace: dump_stack_lvl+0x66/0xa0 print_report+0xce/0x630 kasan_report+0xe0/0x110 ocfs2_xattr_find_entry+0x5a/0x170 ocfs2_xattr_get_nolock+0x20a/0x820 ocfs2_xattr_get+0x10c/0x1e0 __vfs_getxattr+0xe2/0x130 vfs_getxattr+0x185/0x1b0",
    "evidence": "osv:CVE-2026-90321",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.114",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
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    "severity": "high",
    "structured": {
      "id": "CVE-2026-90321",
      "aliases": [
        "CVE-2026-90321"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
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      "affected": [
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:35.530097639Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3fd45b24879fa4885b66a582a6e47eda67f11310",
        "https://git.kernel.org/stable/c/7dec19f6bafe4e1503007141c9f5eb7eb10e5578",
        "https://git.kernel.org/stable/c/8138d06e7a1d9a0b0481dc015c67b34e8bb60a58",
        "https://git.kernel.org/stable/c/8914a3330b72378136c2c02d6328a826f6abdad7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90321.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90321",
        "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/2026/90xxx/CVE-2026-90321.json"
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    "related_cves": [
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        "value": "CVE-2026-90321",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 502976,
  "published_at": "2026-09-17T16:08:38.138+00:00"
}