CVE-2025-38206 (GCVE-0-2025-38206)
Vulnerability from cvelistv5
Published
2025-07-04 13:37
Modified
2026-08-05 12:00
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: exfat: fix double free in delayed_free The double free could happen in the following path. exfat_create_upcase_table() exfat_create_upcase_table() : return error exfat_free_upcase_table() : free ->vol_utbl exfat_load_default_upcase_table : return error exfat_kill_sb() delayed_free() exfat_free_upcase_table() <--------- double free This patch set ->vol_util as NULL after freeing it.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003
Version: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003
Version: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003
Version: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:35:27.691Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-38206",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T20:42:19.143911Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-11T18:44:21.826Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/exfat/nls.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "13d8de1b6568dcc31a95534ced16bc0c9a67bc15",
              "status": "affected",
              "version": "1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003",
              "versionType": "git"
            },
            {
              "lessThan": "66e84439ec2af776ce749e8540f8fdd257774152",
              "status": "affected",
              "version": "1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003",
              "versionType": "git"
            },
            {
              "lessThan": "d3cef0e7a5c1aa6217c51faa9ce8ecac35d6e1fd",
              "status": "affected",
              "version": "1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003",
              "versionType": "git"
            },
            {
              "lessThan": "1f3d9724e16d62c7d42c67d6613b8512f2887c22",
              "status": "affected",
              "version": "1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/exfat/nls.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.239",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.186",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.239",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.186",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.4",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: fix double free in delayed_free\n\nThe double free could happen in the following path.\n\nexfat_create_upcase_table()\n        exfat_create_upcase_table() : return error\n        exfat_free_upcase_table() : free -\u003evol_utbl\n        exfat_load_default_upcase_table : return error\n     exfat_kill_sb()\n           delayed_free()\n                  exfat_free_upcase_table() \u003c--------- double free\nThis patch set -\u003evol_util as NULL after freeing it."
        }
      ],
      "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only through the local `mount(2)`/`fsconfig(2)` path on a block device holding a crafted exfat image (removable media, loop device, or USB stick on a kiosk/Android handset). There is no remote or network data path into `exfat_create_upcase_table()`.\nAC:L - The attacker deterministically forces the first free by crafting an upcase-table dentry with a bad checksum, and can drive the required `kvcalloc` failure by generating memory/vmalloc pressure while repeatedly re-mounting the image, so success is not gated on conditions outside their influence. Consistent with prior kernel CNA scoring of allocation-failure-dependent bugs, this is Low.\nPR:L - exfat is the standard removable-media filesystem on Android and desktop Linux, where vold and udisks2 auto-mount attacker-supplied SD cards and USB sticks on behalf of the unprivileged seat/session user, so no elevated credentials are needed to reach `exfat_fill_super`. This matches the Low value assigned to the other exfat mount-time image-parsing CVEs.\nUI:N - On auto-mounting systems the crafted volume is parsed by the kernel as soon as the attacker attaches the media, and a local user with removable-media or loop-mount rights performs the entire sequence from their own process. No separate victim action is required.\nS:U - The freed `sbi-\u003evol_utbl` allocation and the resulting corruption are entirely within the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The second `kvfree()` occurs in an RCU callback long after the first, so the 128 KiB region can be reallocated to an unrelated kernel object that is then released while still referenced, giving the attacker a page/vmap-level use-after-free usable as an arbitrary kernel-memory read primitive. Double-free-class corruption is scored High.\nI:H - Freeing memory that has already been reassigned lets the attacker spray controlled data into pages or vmap areas still in use by other subsystems (kernel stacks, BPF allocations, slab metadata), yielding a write primitive and control-flow hijack potential. This is full memory corruption, not a benign accounting error.\nA:H - Even without exploitation, the double free triggers a page-allocator/vfree corruption `BUG`/`WARN` in an RCU callback context or corrupts freelists, producing a kernel oops or panic. With `panic_on_warn` set, the \"Trying to vfree() nonexistent vm area\" path is an immediate full system panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:00:21.380Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/13d8de1b6568dcc31a95534ced16bc0c9a67bc15"
        },
        {
          "url": "https://git.kernel.org/stable/c/66e84439ec2af776ce749e8540f8fdd257774152"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3cef0e7a5c1aa6217c51faa9ce8ecac35d6e1fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f3d9724e16d62c7d42c67d6613b8512f2887c22"
        }
      ],
      "title": "exfat: fix double free in delayed_free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38206",
    "datePublished": "2025-07-04T13:37:25.966Z",
    "dateReserved": "2025-04-16T04:51:23.994Z",
    "dateUpdated": "2026-08-05T12:00:21.380Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T17:35:27.691Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-38206\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T20:42:19.143911Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T17:39:17.002Z\"}}], \"cna\": {\"title\": \"exfat: fix double free in delayed_free\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The bug is reached only through the local `mount(2)`/`fsconfig(2)` path on a block device holding a crafted exfat image (removable media, loop device, or USB stick on a kiosk/Android handset). There is no remote or network data path into `exfat_create_upcase_table()`.\\nAC:L - The attacker deterministically forces the first free by crafting an upcase-table dentry with a bad checksum, and can drive the required `kvcalloc` failure by generating memory/vmalloc pressure while repeatedly re-mounting the image, so success is not gated on conditions outside their influence. Consistent with prior kernel CNA scoring of allocation-failure-dependent bugs, this is Low.\\nPR:L - exfat is the standard removable-media filesystem on Android and desktop Linux, where vold and udisks2 auto-mount attacker-supplied SD cards and USB sticks on behalf of the unprivileged seat/session user, so no elevated credentials are needed to reach `exfat_fill_super`. This matches the Low value assigned to the other exfat mount-time image-parsing CVEs.\\nUI:N - On auto-mounting systems the crafted volume is parsed by the kernel as soon as the attacker attaches the media, and a local user with removable-media or loop-mount rights performs the entire sequence from their own process. No separate victim action is required.\\nS:U - The freed `sbi-\u003evol_utbl` allocation and the resulting corruption are entirely within the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The second `kvfree()` occurs in an RCU callback long after the first, so the 128 KiB region can be reallocated to an unrelated kernel object that is then released while still referenced, giving the attacker a page/vmap-level use-after-free usable as an arbitrary kernel-memory read primitive. Double-free-class corruption is scored High.\\nI:H - Freeing memory that has already been reassigned lets the attacker spray controlled data into pages or vmap areas still in use by other subsystems (kernel stacks, BPF allocations, slab metadata), yielding a write primitive and control-flow hijack potential. This is full memory corruption, not a benign accounting error.\\nA:H - Even without exploitation, the double free triggers a page-allocator/vfree corruption `BUG`/`WARN` in an RCU callback context or corrupts freelists, producing a kernel oops or panic. With `panic_on_warn` set, the \\\"Trying to vfree() nonexistent vm area\\\" path is an immediate full system panic.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003\", \"lessThan\": \"13d8de1b6568dcc31a95534ced16bc0c9a67bc15\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003\", \"lessThan\": \"66e84439ec2af776ce749e8540f8fdd257774152\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003\", \"lessThan\": \"d3cef0e7a5c1aa6217c51faa9ce8ecac35d6e1fd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003\", \"lessThan\": \"1f3d9724e16d62c7d42c67d6613b8512f2887c22\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/exfat/nls.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.239\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.186\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.15.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/exfat/nls.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/13d8de1b6568dcc31a95534ced16bc0c9a67bc15\"}, {\"url\": \"https://git.kernel.org/stable/c/66e84439ec2af776ce749e8540f8fdd257774152\"}, {\"url\": \"https://git.kernel.org/stable/c/d3cef0e7a5c1aa6217c51faa9ce8ecac35d6e1fd\"}, {\"url\": \"https://git.kernel.org/stable/c/1f3d9724e16d62c7d42c67d6613b8512f2887c22\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nexfat: fix double free in delayed_free\\n\\nThe double free could happen in the following path.\\n\\nexfat_create_upcase_table()\\n        exfat_create_upcase_table() : return error\\n        exfat_free_upcase_table() : free -\u003evol_utbl\\n        exfat_load_default_upcase_table : return error\\n     exfat_kill_sb()\\n           delayed_free()\\n                  exfat_free_upcase_table() \u003c--------- double free\\nThis patch set -\u003evol_util as NULL after freeing it.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.239\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.186\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15.4\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16\", \"versionStartIncluding\": \"5.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:00:21.380Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-38206\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T12:00:21.380Z\", \"dateReserved\": \"2025-04-16T04:51:23.994Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-07-04T13:37:25.966Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.