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EUVD-2026-344907

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:58

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T07:58:38.531246+00:00",
  "id": "EUVD-2026-344907"
}

CVE-2022-50394 (GCVE-0-2022-50394)

Vulnerability from cvelistv5 – Published: 2025-09-18 13:33 – Updated: 2026-08-05 08:58

Title

i2c: ismt: Fix an out-of-bounds bug in ismt_access()

Summary

In the Linux kernel, the following vulnerability has been resolved: i2c: ismt: Fix an out-of-bounds bug in ismt_access() When the driver does not check the data from the user, the variable 'data->block[0]' may be very large to cause an out-of-bounds bug. The following log can reveal it: [ 33.995542] i2c i2c-1: ioctl, cmd=0x720, arg=0x7ffcb3dc3a20 [ 33.995978] ismt_smbus 0000:00:05.0: I2C_SMBUS_BLOCK_DATA: WRITE [ 33.996475] ================================================================== [ 33.996995] BUG: KASAN: out-of-bounds in ismt_access.cold+0x374/0x214b [ 33.997473] Read of size 18446744073709551615 at addr ffff88810efcfdb1 by task ismt_poc/485 [ 33.999450] Call Trace: [ 34.001849] memcpy+0x20/0x60 [ 34.002077] ismt_access.cold+0x374/0x214b [ 34.003382] __i2c_smbus_xfer+0x44f/0xfb0 [ 34.004007] i2c_smbus_xfer+0x10a/0x390 [ 34.004291] i2cdev_ioctl_smbus+0x2c8/0x710 [ 34.005196] i2cdev_ioctl+0x5ec/0x74c Fix this bug by checking the size of 'data->block[0]' first.

Severity

7.8 (High)


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

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-14 18:51 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

Linux mitre root Scorecard

References

9 references

URL	Tags
https://git.kernel.org/stable/c/4a7bb1d93addb2f67…
https://git.kernel.org/stable/c/03b7ef7a6c5ca1ff5…
https://git.kernel.org/stable/c/bfe41d966c860a8ad…
https://git.kernel.org/stable/c/cdcbae2c5003747dd…
https://git.kernel.org/stable/c/9ac541a0898e8ec18…
https://git.kernel.org/stable/c/96c12fd0ec7464129…
https://git.kernel.org/stable/c/a642469d464b2780a…
https://git.kernel.org/stable/c/233348a04becf1332…
https://git.kernel.org/stable/c/39244cc754829bf70…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 4a7bb1d93addb2f67e36fed00a53cb7f270d7b7a (git) Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 03b7ef7a6c5ca1ff553470166b4919db88b810f6 (git) Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < bfe41d966c860a8ad4c735639d616da270c92735 (git) Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd (git) Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 9ac541a0898e8ec187a3fa7024b9701cffae6bf2 (git) Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 96c12fd0ec74641295e1c3c34dea3dce1b6c3422 (git) Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < a642469d464b2780a25a49b51ae56623c65eac34 (git) Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 233348a04becf133283f0076e20b317302de21d9 (git) Affected: 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 , < 39244cc754829bf707dccd12e2ce37510f5b1f8d (git)
Linux	Linux	Affected: 3.9 Unaffected: 0 , < 3.9 (semver) Unaffected: 4.9.337 , ≤ 4.9.* (semver) Unaffected: 4.14.303 , ≤ 4.14.* (semver) Unaffected: 4.19.270 , ≤ 4.19.* (semver) Unaffected: 5.4.229 , ≤ 5.4.* (semver) Unaffected: 5.10.163 , ≤ 5.10.* (semver) Unaffected: 5.15.86 , ≤ 5.15.* (semver) Unaffected: 6.0.16 , ≤ 6.0.* (semver) Unaffected: 6.1.2 , ≤ 6.1.* (semver) Unaffected: 6.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.1,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2022-50394",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-14T18:51:21.854586Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-125",
                "description": "CWE-125 Out-of-bounds Read",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-14T18:53:05.857Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/i2c/busses/i2c-ismt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4a7bb1d93addb2f67e36fed00a53cb7f270d7b7a",
              "status": "affected",
              "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9",
              "versionType": "git"
            },
            {
              "lessThan": "03b7ef7a6c5ca1ff553470166b4919db88b810f6",
              "status": "affected",
              "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9",
              "versionType": "git"
            },
            {
              "lessThan": "bfe41d966c860a8ad4c735639d616da270c92735",
              "status": "affected",
              "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9",
              "versionType": "git"
            },
            {
              "lessThan": "cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd",
              "status": "affected",
              "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9",
              "versionType": "git"
            },
            {
              "lessThan": "9ac541a0898e8ec187a3fa7024b9701cffae6bf2",
              "status": "affected",
              "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9",
              "versionType": "git"
            },
            {
              "lessThan": "96c12fd0ec74641295e1c3c34dea3dce1b6c3422",
              "status": "affected",
              "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9",
              "versionType": "git"
            },
            {
              "lessThan": "a642469d464b2780a25a49b51ae56623c65eac34",
              "status": "affected",
              "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9",
              "versionType": "git"
            },
            {
              "lessThan": "233348a04becf133283f0076e20b317302de21d9",
              "status": "affected",
              "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9",
              "versionType": "git"
            },
            {
              "lessThan": "39244cc754829bf707dccd12e2ce37510f5b1f8d",
              "status": "affected",
              "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/i2c/busses/i2c-ismt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.9"
            },
            {
              "lessThan": "3.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.337",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.303",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.229",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.337",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.303",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.270",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.229",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.163",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.86",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.16",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.2",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: ismt: Fix an out-of-bounds bug in ismt_access()\n\nWhen the driver does not check the data from the user, the variable\n\u0027data-\u003eblock[0]\u0027 may be very large to cause an out-of-bounds bug.\n\nThe following log can reveal it:\n\n[   33.995542] i2c i2c-1: ioctl, cmd=0x720, arg=0x7ffcb3dc3a20\n[   33.995978] ismt_smbus 0000:00:05.0: I2C_SMBUS_BLOCK_DATA:  WRITE\n[   33.996475] ==================================================================\n[   33.996995] BUG: KASAN: out-of-bounds in ismt_access.cold+0x374/0x214b\n[   33.997473] Read of size 18446744073709551615 at addr ffff88810efcfdb1 by task ismt_poc/485\n[   33.999450] Call Trace:\n[   34.001849]  memcpy+0x20/0x60\n[   34.002077]  ismt_access.cold+0x374/0x214b\n[   34.003382]  __i2c_smbus_xfer+0x44f/0xfb0\n[   34.004007]  i2c_smbus_xfer+0x10a/0x390\n[   34.004291]  i2cdev_ioctl_smbus+0x2c8/0x710\n[   34.005196]  i2cdev_ioctl+0x5ec/0x74c\n\nFix this bug by checking the size of \u0027data-\u003eblock[0]\u0027 first."
        }
      ],
      "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 - Reachable only via local I2C_SMBUS ioctl on /dev/i2c-* (i2cdev_ioctl \u2192 i2cdev_ioctl_smbus \u2192 i2c_smbus_xfer \u2192 ismt_access); not network- or physically-triggered.\nAC:L - Attacker fully controls block[0] in the ioctl payload and can reliably trigger the OOB memcpy (including the u8 wrap to SIZE_MAX when block[0]==255); no race or external conditions required.\nPR:L - No capability check in i2cdev_open; access is only gated by /dev/i2c-* permissions, which commonly allow non-root users (e.g. i2c group). Matches sibling i2c block-length scores such as CVE-2026-64191.\nUI:N - Exploitation requires only the attacker\u0027s own open/ioctl sequence; no victim action is needed.\nS:U - Impact is confined to the host kernel privilege boundary (memory corruption / DoS); no VM escape or cross-authority boundary crossing.\nC:H - memcpy performs an unbounded/out-of-bounds read from union i2c_smbus_data past the 34-byte block buffer, disclosing adjacent kernel memory; oversized DMA mapping can further expose kernel data.\nI:H - The same memcpy writes past priv-\u003ebuffer into adjacent ismt_priv fields (e.g. log_dma/log), giving a heap structure corruption / write primitive; out-of-bounds write is High per guidance.\nA:H - The OOB access causes a kernel oops/KASAN crash (as in the reported PoC), enabling reliable denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:58:32.577Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4a7bb1d93addb2f67e36fed00a53cb7f270d7b7a"
        },
        {
          "url": "https://git.kernel.org/stable/c/03b7ef7a6c5ca1ff553470166b4919db88b810f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfe41d966c860a8ad4c735639d616da270c92735"
        },
        {
          "url": "https://git.kernel.org/stable/c/cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ac541a0898e8ec187a3fa7024b9701cffae6bf2"
        },
        {
          "url": "https://git.kernel.org/stable/c/96c12fd0ec74641295e1c3c34dea3dce1b6c3422"
        },
        {
          "url": "https://git.kernel.org/stable/c/a642469d464b2780a25a49b51ae56623c65eac34"
        },
        {
          "url": "https://git.kernel.org/stable/c/233348a04becf133283f0076e20b317302de21d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/39244cc754829bf707dccd12e2ce37510f5b1f8d"
        }
      ],
      "title": "i2c: ismt: Fix an out-of-bounds bug in ismt_access()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50394",
    "datePublished": "2025-09-18T13:33:12.992Z",
    "dateReserved": "2025-09-17T14:53:06.998Z",
    "dateUpdated": "2026-08-05T08:58:32.577Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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EUVD-2026-344907

CVE-2022-50394 (GCVE-0-2022-50394)

Tags

Sightings

Nomenclature

Related by attack behaviour