CVE-2023-53276 (GCVE-0-2023-53276)

Vulnerability from cvelistv5 – Published: 2025-09-16 08:11 – Updated: 2026-05-11 19:41
VLAI
Title
ubifs: Free memory for tmpfile name
Summary
In the Linux kernel, the following vulnerability has been resolved: ubifs: Free memory for tmpfile name When opening a ubifs tmpfile on an encrypted directory, function fscrypt_setup_filename allocates memory for the name that is to be stored in the directory entry, but after the name has been copied to the directory entry inode, the memory is not freed. When running kmemleak on it we see that it is registered as a leak. The report below is triggered by a simple program 'tmpfile' just opening a tmpfile: unreferenced object 0xffff88810178f380 (size 32): comm "tmpfile", pid 509, jiffies 4294934744 (age 1524.742s) backtrace: __kmem_cache_alloc_node __kmalloc fscrypt_setup_filename ubifs_tmpfile vfs_tmpfile path_openat Free this memory after it has been copied to the inode.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:07 UTC
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6618 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f4f61d2cc6d8789a52245a4733b3e5643be154f3 , < 8ad8c67a897e68426e85990ebfe0a7d1f71fc79f (git)
Affected: f4f61d2cc6d8789a52245a4733b3e5643be154f3 , < 107d481642c356a5668058066360fc473911e628 (git)
Affected: f4f61d2cc6d8789a52245a4733b3e5643be154f3 , < 823f554747f8aafaa965fb2f3ae794110ed429ef (git)
Affected: f4f61d2cc6d8789a52245a4733b3e5643be154f3 , < b8f444a4fadfb5070ed7e298e0a5ceb4a18014f3 (git)
Affected: f4f61d2cc6d8789a52245a4733b3e5643be154f3 , < ce840284929b75dbbf062e0ce7fcb78a63b08b5e (git)
Affected: f4f61d2cc6d8789a52245a4733b3e5643be154f3 , < 29738e1bcc799dd754711d4e4aab967f0c018175 (git)
Affected: f4f61d2cc6d8789a52245a4733b3e5643be154f3 , < fd197308c0e4f738c7ea687d5332035c5753881c (git)
Affected: f4f61d2cc6d8789a52245a4733b3e5643be154f3 , < 1e43d4284bdc3bd34bd770fea13910ac37ab0618 (git)
Affected: f4f61d2cc6d8789a52245a4733b3e5643be154f3 , < 1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 4.14.315 , ≤ 4.14.* (semver)
Unaffected: 4.19.283 , ≤ 4.19.* (semver)
Unaffected: 5.4.243 , ≤ 5.4.* (semver)
Unaffected: 5.10.180 , ≤ 5.10.* (semver)
Unaffected: 5.15.111 , ≤ 5.15.* (semver)
Unaffected: 6.1.28 , ≤ 6.1.* (semver)
Unaffected: 6.2.15 , ≤ 6.2.* (semver)
Unaffected: 6.3.2 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        ],
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: Free memory for tmpfile name\n\nWhen opening a ubifs tmpfile on an encrypted directory, function\nfscrypt_setup_filename allocates memory for the name that is to be\nstored in the directory entry, but after the name has been copied to the\ndirectory entry inode, the memory is not freed.\n\nWhen running kmemleak on it we see that it is registered as a leak. The\nreport below is triggered by a simple program \u0027tmpfile\u0027 just opening a\ntmpfile:\n\n  unreferenced object 0xffff88810178f380 (size 32):\n    comm \"tmpfile\", pid 509, jiffies 4294934744 (age 1524.742s)\n    backtrace:\n      __kmem_cache_alloc_node\n      __kmalloc\n      fscrypt_setup_filename\n      ubifs_tmpfile\n      vfs_tmpfile\n      path_openat\n\nFree this memory after it has been copied to the inode."
          }
        ],
        "id": "CVE-2023-53276",
        "lastModified": "2026-06-17T06:44:42.973",
        "metrics": {
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              "cvssData": {
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    "redhat_vex": {
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      "cve": "CVE-2023-53276",
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      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "14",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Kernel: Denial of Service via ubifs memory leak",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53276.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:08:29Z",
      "cve": "CVE-2023-53276",
      "id": "CVE-2023-53276",
      "initial_release_date": "2025-09-16T23:30:30Z",
      "product_status:known_affected": "419",
      "product_status:known_not_affected": "320",
      "product_status:recommended": "206",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53276",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53276.json",
      "version": "24"
    },
    "vulnrichment": {
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              {
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              "shortName": "CISA-ADP"
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              "vendor": "Linux",
              "versions": [
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: Free memory for tmpfile name\n\nWhen opening a ubifs tmpfile on an encrypted directory, function\nfscrypt_setup_filename allocates memory for the name that is to be\nstored in the directory entry, but after the name has been copied to the\ndirectory entry inode, the memory is not freed.\n\nWhen running kmemleak on it we see that it is registered as a leak. The\nreport below is triggered by a simple program \u0027tmpfile\u0027 just opening a\ntmpfile:\n\n  unreferenced object 0xffff88810178f380 (size 32):\n    comm \"tmpfile\", pid 509, jiffies 4294934744 (age 1524.742s)\n    backtrace:\n      __kmem_cache_alloc_node\n      __kmalloc\n      fscrypt_setup_filename\n      ubifs_tmpfile\n      vfs_tmpfile\n      path_openat\n\nFree this memory after it has been copied to the inode."
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  }
}



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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.