Vulnerability-Lookup

GHSA-349Q-HP2F-R4HF

Vulnerability from github – Published: 2025-07-04 15:31 – Updated: 2026-09-02 15:33

Details

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.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38206"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-415"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-04T14:15:28Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-349q-hp2f-r4hf",
  "modified": "2026-09-02T15:33:17Z",
  "published": "2025-07-04T15:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38206"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13d8de1b6568dcc31a95534ced16bc0c9a67bc15"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f3d9724e16d62c7d42c67d6613b8512f2887c22"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29abaf93357f4a7d083cf399d4306999e20db31d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66e84439ec2af776ce749e8540f8fdd257774152"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac65f76db9b2ff3fbc9e198c0e9aaf81b111b7d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3cef0e7a5c1aa6217c51faa9ce8ecac35d6e1fd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea27703eb0efbadcd45b9949526160ed90536a72"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-38206 (GCVE-0-2025-38206)

Vulnerability from cvelistv5 – Published: 2025-07-04 13:37 – Updated: 2026-09-02 12:49

Title

exfat: fix double free in delayed_free

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.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-10 20:42 UTC

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/13d8de1b6568dcc31…
https://git.kernel.org/stable/c/66e84439ec2af776c…
https://git.kernel.org/stable/c/ea27703eb0efbadcd…
https://git.kernel.org/stable/c/ac65f76db9b2ff3fb…
https://git.kernel.org/stable/c/29abaf93357f4a7d0…
https://git.kernel.org/stable/c/d3cef0e7a5c1aa621…
https://git.kernel.org/stable/c/1f3d9724e16d62c7d…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < 13d8de1b6568dcc31a95534ced16bc0c9a67bc15 (git) Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < 66e84439ec2af776ce749e8540f8fdd257774152 (git) Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < ea27703eb0efbadcd45b9949526160ed90536a72 (git) Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < ac65f76db9b2ff3fbc9e198c0e9aaf81b111b7d0 (git) Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < 29abaf93357f4a7d083cf399d4306999e20db31d (git) Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < d3cef0e7a5c1aa6217c51faa9ce8ecac35d6e1fd (git) Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < 1f3d9724e16d62c7d42c67d6613b8512f2887c22 (git)
Linux	Linux	Affected: 5.7 Unaffected: 0 , < 5.7 (semver) Unaffected: 5.10.239 , ≤ 5.10.* (semver) Unaffected: 5.15.186 , ≤ 5.15.* (semver) Unaffected: 6.1.187 , ≤ 6.1.* (semver) Unaffected: 6.6.156 , ≤ 6.6.* (semver) Unaffected: 6.12.108 , ≤ 6.12.* (semver) Unaffected: 6.15.4 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:35:27.691Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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        "title": "CVE Program Container"
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              "content": {
                "id": "CVE-2025-38206",
                "options": [
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                    "Exploitation": "none"
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                    "Automatable": "no"
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                    "Technical Impact": "total"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T20:42:19.143911Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-06-11T18:44:21.826Z",
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      "affected": [
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          "versions": [
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                },
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          "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."
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              "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."
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      "title": "exfat: fix double free in delayed_free",
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    "cveId": "CVE-2025-38206",
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    "state": "PUBLISHED"
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}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-349Q-HP2F-R4HF

CVE-2025-38206 (GCVE-0-2025-38206)

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Nomenclature

Related by attack behaviour