CVE-2026-63814 (GCVE-0-2026-63814)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-20 13:40
VLAI
Title
f2fs: validate ACL entry sizes in f2fs_acl_from_disk()
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: validate ACL entry sizes in f2fs_acl_from_disk() f2fs_acl_count() only validates the aggregate ACL xattr length. A malformed ACL can still place ACL_USER or ACL_GROUP in a slot that only contains struct f2fs_acl_entry_short bytes, and f2fs_acl_from_disk() then reads entry->e_id before verifying that a full entry fits. Require a short entry before reading e_tag and e_perm, and require a full entry before reading e_id for ACL_USER and ACL_GROUP. Return -EFSCORRUPTED from these new truncated-entry checks, while keeping the pre-existing -EINVAL paths unchanged. Validation reproduced this kernel report: KASAN slab-out-of-bounds in __f2fs_get_acl+0x6fb/0x7e0 RIP: 0033:0x7f4b835ea7aa The buggy address belongs to the object at ffff888114589960 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 8-byte region [ffff888114589960, ffff888114589968) Read of size 4 Call trace: dump_stack_lvl+0x66/0xa0 (?:?) print_report+0xce/0x630 (?:?) __f2fs_get_acl+0x6fb/0x7e0 (fs/f2fs/acl.c:169) srso_alias_return_thunk+0x5/0xfbef5 (?:?) __virt_addr_valid+0x224/0x430 (?:?) kasan_report+0xe0/0x110 (?:?) __f2fs_get_acl+0x5/0x7e0 (fs/f2fs/acl.c:169) __get_acl+0x281/0x380 (?:?) vfs_get_acl+0x10b/0x190 (?:?) do_get_acl+0x2a/0x410 (?:?) do_get_acl+0x9/0x410 (?:?) do_getxattr+0xe8/0x260 (?:?) filename_getxattr+0xd1/0x140 (?:?) do_getname+0x2d/0x2d0 (?:?) path_getxattrat+0x16c/0x200 (?:?) lock_release+0xc8/0x290 (?:?) cgroup_update_frozen+0x9d/0x320 (?:?) lockdep_hardirqs_on_prepare+0xea/0x1a0 (?:?) trace_hardirqs_on+0x1a/0x170 (?:?) _raw_spin_unlock_irq+0x28/0x50 (?:?) do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87) entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)
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: af48b85b8cd3fbb12c9b6759c16db6d69c0b03da , < 733cd8474e6d763d75ed96f3f2b98a25480cf2b9 (git)
Affected: af48b85b8cd3fbb12c9b6759c16db6d69c0b03da , < 4e2a96ec7236e248e706850568e0a925fd21b588 (git)
Affected: af48b85b8cd3fbb12c9b6759c16db6d69c0b03da , < 442ca20c54038e2400cf28aaa944cf1de2c8e65d (git)
Affected: af48b85b8cd3fbb12c9b6759c16db6d69c0b03da , < 1ddf3fd21c4c652f9cab5552515c04a166662306 (git)
Affected: af48b85b8cd3fbb12c9b6759c16db6d69c0b03da , < aba4f94ac1832c7299c33e1b4fe5f87eef6dc8f1 (git)
Affected: af48b85b8cd3fbb12c9b6759c16db6d69c0b03da , < ff83de56882cb8466184d322abece2589258ca56 (git)
Affected: af48b85b8cd3fbb12c9b6759c16db6d69c0b03da , < 5d8a39649947a4e86c8fbc682d7fc0041b8d109a (git)
Affected: af48b85b8cd3fbb12c9b6759c16db6d69c0b03da , < c4810ada31e80cbe4011467c4f3b1e93f94134f3 (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/acl.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "3.8"
            },
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              "lessThan": "3.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.260",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.211",
              "versionType": "semver"
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.177",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.260",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "3.8",
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: validate ACL entry sizes in f2fs_acl_from_disk()\n\nf2fs_acl_count() only validates the aggregate ACL xattr length. A\nmalformed ACL can still place ACL_USER or ACL_GROUP in a slot that only\ncontains struct f2fs_acl_entry_short bytes, and f2fs_acl_from_disk()\nthen reads entry-\u003ee_id before verifying that a full entry fits.\n\nRequire a short entry before reading e_tag and e_perm, and require a\nfull entry before reading e_id for ACL_USER and ACL_GROUP. Return\n-EFSCORRUPTED from these new truncated-entry checks, while keeping the\npre-existing -EINVAL paths unchanged.\n\nValidation reproduced this kernel report:\nKASAN slab-out-of-bounds in __f2fs_get_acl+0x6fb/0x7e0\nRIP: 0033:0x7f4b835ea7aa\nThe buggy address belongs to the object at ffff888114589960 which belongs\nto the cache kmalloc-8 of size 8\nThe buggy address is located 0 bytes to the right of allocated 8-byte\nregion [ffff888114589960, ffff888114589968)\nRead of size 4\nCall trace:\n  dump_stack_lvl+0x66/0xa0 (?:?)\n  print_report+0xce/0x630 (?:?)\n  __f2fs_get_acl+0x6fb/0x7e0 (fs/f2fs/acl.c:169)\n  srso_alias_return_thunk+0x5/0xfbef5 (?:?)\n  __virt_addr_valid+0x224/0x430 (?:?)\n  kasan_report+0xe0/0x110 (?:?)\n  __f2fs_get_acl+0x5/0x7e0 (fs/f2fs/acl.c:169)\n  __get_acl+0x281/0x380 (?:?)\n  vfs_get_acl+0x10b/0x190 (?:?)\n  do_get_acl+0x2a/0x410 (?:?)\n  do_get_acl+0x9/0x410 (?:?)\n  do_getxattr+0xe8/0x260 (?:?)\n  filename_getxattr+0xd1/0x140 (?:?)\n  do_getname+0x2d/0x2d0 (?:?)\n  path_getxattrat+0x16c/0x200 (?:?)\n  lock_release+0xc8/0x290 (?:?)\n  cgroup_update_frozen+0x9d/0x320 (?:?)\n  lockdep_hardirqs_on_prepare+0xea/0x1a0 (?:?)\n  trace_hardirqs_on+0x1a/0x170 (?:?)\n  _raw_spin_unlock_irq+0x28/0x50 (?:?)\n  do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)"
        }
      ],
      "metrics": [
        {
          "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"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:40:21.598Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/733cd8474e6d763d75ed96f3f2b98a25480cf2b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e2a96ec7236e248e706850568e0a925fd21b588"
        },
        {
          "url": "https://git.kernel.org/stable/c/442ca20c54038e2400cf28aaa944cf1de2c8e65d"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ddf3fd21c4c652f9cab5552515c04a166662306"
        },
        {
          "url": "https://git.kernel.org/stable/c/aba4f94ac1832c7299c33e1b4fe5f87eef6dc8f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff83de56882cb8466184d322abece2589258ca56"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d8a39649947a4e86c8fbc682d7fc0041b8d109a"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4810ada31e80cbe4011467c4f3b1e93f94134f3"
        }
      ],
      "title": "f2fs: validate ACL entry sizes in f2fs_acl_from_disk()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63814",
    "datePublished": "2026-07-19T12:02:14.771Z",
    "dateReserved": "2026-07-19T07:54:57.014Z",
    "dateUpdated": "2026-07-20T13:40:21.598Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63814",
      "date": "2026-07-21",
      "epss": "0.0012",
      "percentile": "0.02197"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-20T14:46:36.000Z",
      "cve": "CVE-2026-63814",
      "id": "msrc_CVE-2026-63814",
      "initial_release_date": "2026-07-20T01:07:45.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "f2fs: validate ACL entry sizes in f2fs_acl_from_disk()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63814.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63814\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T12:16:54.390\",\"lastModified\":\"2026-07-20T15:16:48.207\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: validate ACL entry sizes in f2fs_acl_from_disk()\\n\\nf2fs_acl_count() only validates the aggregate ACL xattr length. A\\nmalformed ACL can still place ACL_USER or ACL_GROUP in a slot that only\\ncontains struct f2fs_acl_entry_short bytes, and f2fs_acl_from_disk()\\nthen reads entry-\u003ee_id before verifying that a full entry fits.\\n\\nRequire a short entry before reading e_tag and e_perm, and require a\\nfull entry before reading e_id for ACL_USER and ACL_GROUP. Return\\n-EFSCORRUPTED from these new truncated-entry checks, while keeping the\\npre-existing -EINVAL paths unchanged.\\n\\nValidation reproduced this kernel report:\\nKASAN slab-out-of-bounds in __f2fs_get_acl+0x6fb/0x7e0\\nRIP: 0033:0x7f4b835ea7aa\\nThe buggy address belongs to the object at ffff888114589960 which belongs\\nto the cache kmalloc-8 of size 8\\nThe buggy address is located 0 bytes to the right of allocated 8-byte\\nregion [ffff888114589960, ffff888114589968)\\nRead of size 4\\nCall trace:\\n  dump_stack_lvl+0x66/0xa0 (?:?)\\n  print_report+0xce/0x630 (?:?)\\n  __f2fs_get_acl+0x6fb/0x7e0 (fs/f2fs/acl.c:169)\\n  srso_alias_return_thunk+0x5/0xfbef5 (?:?)\\n  __virt_addr_valid+0x224/0x430 (?:?)\\n  kasan_report+0xe0/0x110 (?:?)\\n  __f2fs_get_acl+0x5/0x7e0 (fs/f2fs/acl.c:169)\\n  __get_acl+0x281/0x380 (?:?)\\n  vfs_get_acl+0x10b/0x190 (?:?)\\n  do_get_acl+0x2a/0x410 (?:?)\\n  do_get_acl+0x9/0x410 (?:?)\\n  do_getxattr+0xe8/0x260 (?:?)\\n  filename_getxattr+0xd1/0x140 (?:?)\\n  do_getname+0x2d/0x2d0 (?:?)\\n  path_getxattrat+0x16c/0x200 (?:?)\\n  lock_release+0xc8/0x290 (?:?)\\n  cgroup_update_frozen+0x9d/0x320 (?:?)\\n  lockdep_hardirqs_on_prepare+0xea/0x1a0 (?:?)\\n  trace_hardirqs_on+0x1a/0x170 (?:?)\\n  _raw_spin_unlock_irq+0x28/0x50 (?:?)\\n  do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/f2fs/acl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"af48b85b8cd3fbb12c9b6759c16db6d69c0b03da\",\"lessThan\":\"733cd8474e6d763d75ed96f3f2b98a25480cf2b9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af48b85b8cd3fbb12c9b6759c16db6d69c0b03da\",\"lessThan\":\"4e2a96ec7236e248e706850568e0a925fd21b588\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af48b85b8cd3fbb12c9b6759c16db6d69c0b03da\",\"lessThan\":\"442ca20c54038e2400cf28aaa944cf1de2c8e65d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af48b85b8cd3fbb12c9b6759c16db6d69c0b03da\",\"lessThan\":\"1ddf3fd21c4c652f9cab5552515c04a166662306\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af48b85b8cd3fbb12c9b6759c16db6d69c0b03da\",\"lessThan\":\"aba4f94ac1832c7299c33e1b4fe5f87eef6dc8f1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af48b85b8cd3fbb12c9b6759c16db6d69c0b03da\",\"lessThan\":\"ff83de56882cb8466184d322abece2589258ca56\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af48b85b8cd3fbb12c9b6759c16db6d69c0b03da\",\"lessThan\":\"5d8a39649947a4e86c8fbc682d7fc0041b8d109a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af48b85b8cd3fbb12c9b6759c16db6d69c0b03da\",\"lessThan\":\"c4810ada31e80cbe4011467c4f3b1e93f94134f3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/f2fs/acl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1ddf3fd21c4c652f9cab5552515c04a166662306\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/442ca20c54038e2400cf28aaa944cf1de2c8e65d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4e2a96ec7236e248e706850568e0a925fd21b588\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d8a39649947a4e86c8fbc682d7fc0041b8d109a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/733cd8474e6d763d75ed96f3f2b98a25480cf2b9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aba4f94ac1832c7299c33e1b4fe5f87eef6dc8f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c4810ada31e80cbe4011467c4f3b1e93f94134f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff83de56882cb8466184d322abece2589258ca56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:01:21+00:00",
      "cve": "CVE-2026-63814",
      "id": "CVE-2026-63814",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: f2fs: validate ACL entry sizes in f2fs_acl_from_disk()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63814.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.