{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50394", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-17T14:53:06.998Z", "datePublished": "2025-09-18T13:33:12.992Z", "dateUpdated": "2026-08-05T08:58:32.577Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:32.577Z" }, "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'data->block[0]' 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 'data->block[0]' first." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Reachable only via local I2C_SMBUS ioctl on /dev/i2c-* (i2cdev_ioctl → i2cdev_ioctl_smbus → i2c_smbus_xfer → 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's 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->buffer 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/i2c/busses/i2c-ismt.c" ], "versions": [ { "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9", "lessThan": "4a7bb1d93addb2f67e36fed00a53cb7f270d7b7a", "status": "affected", "versionType": "git" }, { "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9", "lessThan": "03b7ef7a6c5ca1ff553470166b4919db88b810f6", "status": "affected", "versionType": "git" }, { "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9", "lessThan": "bfe41d966c860a8ad4c735639d616da270c92735", "status": "affected", "versionType": "git" }, { "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9", "lessThan": "cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd", "status": "affected", "versionType": "git" }, { "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9", "lessThan": "9ac541a0898e8ec187a3fa7024b9701cffae6bf2", "status": "affected", "versionType": "git" }, { "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9", "lessThan": "96c12fd0ec74641295e1c3c34dea3dce1b6c3422", "status": "affected", "versionType": "git" }, { "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9", "lessThan": "a642469d464b2780a25a49b51ae56623c65eac34", "status": "affected", "versionType": "git" }, { "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9", "lessThan": "233348a04becf133283f0076e20b317302de21d9", "status": "affected", "versionType": "git" }, { "version": "13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9", "lessThan": "39244cc754829bf707dccd12e2ce37510f5b1f8d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/i2c/busses/i2c-ismt.c" ], "versions": [ { "version": "3.9", "status": "affected" }, { "version": "0", "lessThan": "3.9", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.337", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.303", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.270", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.86", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.16", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.2", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "4.9.337" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "4.14.303" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "4.19.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "5.15.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.0.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.1.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.2" } ] } ] } ], "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" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-50394", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T18:51:21.854586Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T18:53:05.857Z" } } ] } }