CVE-2026-63816 (GCVE-0-2026-63816)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-20 13:40
VLAI
Title
f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode - ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE) - shrink - f2fs_gc - gc_data_segment - ra_data_block(cow_inode) - mapping = F2FS_I(inode)->atomic_inode->i_mapping : f2fs_is_cow_file(cow_inode) is true - f2fs_evict_inode(atomic_inode) - clear_inode_flag(fi->cow_inode, FI_COW_FILE) - F2FS_I(fi->cow_inode)->atomic_inode = NULL ... - truncate_inode_pages_final(atomic_inode) - f2fs_grab_cache_folio(mapping) : create folio in atomic_inode->mapping - clear_inode(atomic_inode) - BUG_ON(atomic_inode->i_data.nrpages) We need to add a reference on fi->atomic_inode before using its mapping field during garbage collection, otherwise, it will cause UAF issue.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3db1de0e582c358dd013f3703cd55b5fe4076436 , < 56038756aae68312df00d4aa1d97e51ef3aca725 (git)
Affected: 3db1de0e582c358dd013f3703cd55b5fe4076436 , < a499f77c06050a28c897bdbd86cd2f0721ae0743 (git)
Affected: 3db1de0e582c358dd013f3703cd55b5fe4076436 , < a805fec35c201c59643ddcde713bce4051c8ee27 (git)
Affected: 3db1de0e582c358dd013f3703cd55b5fe4076436 , < e0288584baa5dc41df4a829a023c4c1b33fe53d7 (git)
Affected: 6db52f1944417c2601182a591a704e2f119c5215 (git)
Affected: 5.18.18 , < 5.19 (semver)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "fs/f2fs/gc.c",
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            "fs/f2fs/gc.c",
            "fs/f2fs/inode.c"
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode\n\n- ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE)\t\t- shrink\n - f2fs_gc\n  - gc_data_segment\n   - ra_data_block(cow_inode)\n    - mapping = F2FS_I(inode)-\u003eatomic_inode-\u003ei_mapping\n    : f2fs_is_cow_file(cow_inode) is true\n\t\t\t\t\t\t - f2fs_evict_inode(atomic_inode)\n\t\t\t\t\t\t  - clear_inode_flag(fi-\u003ecow_inode, FI_COW_FILE)\n\t\t\t\t\t\t  - F2FS_I(fi-\u003ecow_inode)-\u003eatomic_inode = NULL\n\t\t\t\t\t\t  ...\n\t\t\t\t\t\t  - truncate_inode_pages_final(atomic_inode)\n    - f2fs_grab_cache_folio(mapping)\n    : create folio in atomic_inode-\u003emapping\n\t\t\t\t\t\t  - clear_inode(atomic_inode)\n\t\t\t\t\t\t   - BUG_ON(atomic_inode-\u003ei_data.nrpages)\n\nWe need to add a reference on fi-\u003eatomic_inode before using its mapping\nfield during garbage collection, otherwise, it will cause UAF issue."
        }
      ],
      "metrics": [
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          "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"
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      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:40:23.624Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/56038756aae68312df00d4aa1d97e51ef3aca725"
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        },
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          "url": "https://git.kernel.org/stable/c/a805fec35c201c59643ddcde713bce4051c8ee27"
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        {
          "url": "https://git.kernel.org/stable/c/e0288584baa5dc41df4a829a023c4c1b33fe53d7"
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      "title": "f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63816",
    "datePublished": "2026-07-19T12:02:15.907Z",
    "dateReserved": "2026-07-19T07:54:57.014Z",
    "dateUpdated": "2026-07-20T13:40:23.624Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-07-21",
      "epss": "0.0012",
      "percentile": "0.02158"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-63816",
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      "initial_release_date": "2026-07-20T01:01:36.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode",
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      "version": "2"
    },
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:01:24+00:00",
      "cve": "CVE-2026-63816",
      "id": "CVE-2026-63816",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63816.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-19T17:34:49Z",
      "cve": "CVE-2026-63816",
      "id": "CVE-2026-63816",
      "initial_release_date": "2026-07-19T17:34:49Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63816",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63816.json",
      "version": "2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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