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CVE-2023-53224 (GCVE-0-2023-53224)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:21 – Updated: 2026-05-11 19:40
VLAI
Title
ext4: Fix function prototype mismatch for ext4_feat_ktype
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: Fix function prototype mismatch for ext4_feat_ktype With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. ext4_feat_ktype was setting the "release" handler to "kfree", which doesn't have a matching function prototype. Add a simple wrapper with the correct prototype. This was found as a result of Clang's new -Wcast-function-type-strict flag, which is more sensitive than the simpler -Wcast-function-type, which only checks for type width mismatches. Note that this code is only reached when ext4 is a loadable module and it is being unloaded: CFI failure at kobject_put+0xbb/0x1b0 (target: kfree+0x0/0x180; expected type: 0x7c4aa698) ... RIP: 0010:kobject_put+0xbb/0x1b0 ... Call Trace: <TASK> ext4_exit_sysfs+0x14/0x60 [ext4] cleanup_module+0x67/0xedb [ext4]
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 17:50 UTC
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b99fee58a20ab8e0557cce87b6f187e325993142 , < 2b69cdd9f9a7f596e3dd31f05f9852940d177924 (git)
Affected: b99fee58a20ab8e0557cce87b6f187e325993142 , < 99e3fd21f8fc975c95e8cf76fbf6a3d2656f8f71 (git)
Affected: b99fee58a20ab8e0557cce87b6f187e325993142 , < 1ba10d3640e9783dad811fe4e24d55465c37c64d (git)
Affected: b99fee58a20ab8e0557cce87b6f187e325993142 , < c98077f7598a562f51051eec043be0cb3e1b1b5e (git)
Affected: b99fee58a20ab8e0557cce87b6f187e325993142 , < 0a1394e07c5d6bf1bfc25db8589ff1b1bfb6f46a (git)
Affected: b99fee58a20ab8e0557cce87b6f187e325993142 , < 94d8de83286fb1827340eba35b61c308f6b46ead (git)
Affected: b99fee58a20ab8e0557cce87b6f187e325993142 , < 118901ad1f25d2334255b3d50512fa20591531cd (git)
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Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 4.19.274 , ≤ 4.19.* (semver)
Unaffected: 5.4.233 , ≤ 5.4.* (semver)
Unaffected: 5.10.170 , ≤ 5.10.* (semver)
Unaffected: 5.15.96 , ≤ 5.15.* (semver)
Unaffected: 6.1.14 , ≤ 6.1.* (semver)
Unaffected: 6.2.1 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "tags": [
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              }
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            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
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        ]
      }
    },
    "redhat_vex": {
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      "current_release_date": "2026-07-21T18:52:15+00:00",
      "cve": "CVE-2023-53224",
      "id": "CVE-2023-53224",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "120",
      "product_status:known_affected": "124",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: Fix function prototype mismatch for ext4_feat_ktype",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53224.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T01:00:29Z",
      "cve": "CVE-2023-53224",
      "id": "CVE-2023-53224",
      "initial_release_date": "2025-09-21T23:24:49Z",
      "product_status:known_affected": "130",
      "product_status:known_not_affected": "393",
      "product_status:recommended": "49",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53224",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53224.json",
      "version": "11"
    },
    "vulnrichment": {
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            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 5.5,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "version": "3.1"
                }
              },
              {
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                    "version": "2.0.3"
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                    "description": "CWE-401 Missing Release of Memory after Effective Lifetime",
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: Fix function prototype mismatch for ext4_feat_ktype\n\nWith clang\u0027s kernel control flow integrity (kCFI, CONFIG_CFI_CLANG),\nindirect call targets are validated against the expected function\npointer prototype to make sure the call target is valid to help mitigate\nROP attacks. If they are not identical, there is a failure at run time,\nwhich manifests as either a kernel panic or thread getting killed.\n\next4_feat_ktype was setting the \"release\" handler to \"kfree\", which\ndoesn\u0027t have a matching function prototype. Add a simple wrapper\nwith the correct prototype.\n\nThis was found as a result of Clang\u0027s new -Wcast-function-type-strict\nflag, which is more sensitive than the simpler -Wcast-function-type,\nwhich only checks for type width mismatches.\n\nNote that this code is only reached when ext4 is a loadable module and\nit is being unloaded:\n\n CFI failure at kobject_put+0xbb/0x1b0 (target: kfree+0x0/0x180; expected type: 0x7c4aa698)\n ...\n RIP: 0010:kobject_put+0xbb/0x1b0\n ...\n Call Trace:\n  \u003cTASK\u003e\n  ext4_exit_sysfs+0x14/0x60 [ext4]\n  cleanup_module+0x67/0xedb [ext4]"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2023-53224",
        "datePublished": "2025-09-15T14:21:53.061Z",
        "dateReserved": "2025-09-15T14:19:21.846Z",
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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

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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.
  • 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.


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.