CVE-2026-64191 (GCVE-0-2026-64191)
Vulnerability from cvelistv5 – Published: 2026-07-20 16:27 – Updated: 2026-08-05 12:39
VLAI
EPSS
VEX
Title
i2c: stub: Reject I2C block transfers with invalid length
Summary
In the Linux kernel, the following vulnerability has been resolved:
i2c: stub: Reject I2C block transfers with invalid length
The I2C_SMBUS_I2C_BLOCK_DATA case in stub_xfer() uses data->block[0]
as the transfer length. The existing check only clamps it to avoid
overrunning the chip->words[256] register array, but does not validate
it against I2C_SMBUS_BLOCK_MAX (32), which is the limit of the union
i2c_smbus_data.block buffer (34 bytes total). The driver is a
development/test tool (CONFIG_I2C_STUB=m, not built by default)
that must be loaded with a chip_addr= parameter.
A local user with access to /dev/i2c-* can issue an I2C_SMBUS ioctl
with I2C_SMBUS_I2C_BLOCK_DATA and data->block[0] > 32, causing
stub_xfer() to read or write past the end of the union
i2c_smbus_data.block buffer:
BUG: KASAN: stack-out-of-bounds in stub_xfer (drivers/i2c/i2c-stub.c:223)
Read of size 1 at addr ffff88800abcfd92 by task exploit/81
Call Trace:
<TASK>
stub_xfer (drivers/i2c/i2c-stub.c:223)
__i2c_smbus_xfer (drivers/i2c/i2c-core-smbus.c:593)
i2c_smbus_xfer (drivers/i2c/i2c-core-smbus.c:536)
i2cdev_ioctl_smbus (drivers/i2c/i2c-dev.c:391)
i2cdev_ioctl (drivers/i2c/i2c-dev.c:478)
__x64_sys_ioctl (fs/ioctl.c:583)
do_syscall_64 (arch/x86/entry/syscall_64.c:94)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
</TASK>
The bug exists because i2c-stub implements .smbus_xfer directly,
bypassing the I2C_SMBUS_BLOCK_MAX validation in
i2c_smbus_xfer_emulated(). The I2C_SMBUS_BLOCK_DATA case in the same
function correctly validates against I2C_SMBUS_BLOCK_MAX, but the
I2C_SMBUS_I2C_BLOCK_DATA case does not.
Fix by rejecting transfers with data->block[0] == 0 or
data->block[0] > I2C_SMBUS_BLOCK_MAX with -EINVAL, consistent with
both the I2C_SMBUS_BLOCK_DATA case in the same function and the
I2C_SMBUS_I2C_BLOCK_DATA validation in i2c_smbus_xfer_emulated().
Severity
7.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4710317891e4824ce1510a6b5066abbd3e917750 , < 7e9072dbd5f2f17934751873450d2c22080ead80
(git)
Affected: 4710317891e4824ce1510a6b5066abbd3e917750 , < 21e87f336ac6303fed54a69b1d0d79a23b25c8d0 (git) Affected: 4710317891e4824ce1510a6b5066abbd3e917750 , < 3fd225f3e4cd67ec8ddab1afed9da03c7c43537c (git) Affected: 4710317891e4824ce1510a6b5066abbd3e917750 , < 1c4ffe6b4f04365485ed58d64c9bb86b46fc9037 (git) Affected: 4710317891e4824ce1510a6b5066abbd3e917750 , < 4bd8635f28c135a08aac6badcd7d9b5cdb34335f (git) Affected: 4710317891e4824ce1510a6b5066abbd3e917750 , < 5f4d2bd028ebb6e4c09a9d64842546022321d4a7 (git) Affected: 4710317891e4824ce1510a6b5066abbd3e917750 , < 0526931b16e5a118d367b7bfce7d797e63f7ac69 (git) Affected: 4710317891e4824ce1510a6b5066abbd3e917750 , < 6036b5067a8199ba7a2dc7b377d4b9dd276d5f9e (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.33
Unaffected: 0 , < 2.6.33 (semver) Unaffected: 5.10.260 , ≤ 5.10.* (semver) Unaffected: 5.15.211 , ≤ 5.15.* (semver) Unaffected: 6.1.177 , ≤ 6.1.* (semver) Unaffected: 6.6.144 , ≤ 6.6.* (semver) Unaffected: 6.12.95 , ≤ 6.12.* (semver) Unaffected: 6.18.37 , ≤ 6.18.* (semver) Unaffected: 7.0.14 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/i2c/i2c-stub.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "7e9072dbd5f2f17934751873450d2c22080ead80",
"status": "affected",
"version": "4710317891e4824ce1510a6b5066abbd3e917750",
"versionType": "git"
},
{
"lessThan": "21e87f336ac6303fed54a69b1d0d79a23b25c8d0",
"status": "affected",
"version": "4710317891e4824ce1510a6b5066abbd3e917750",
"versionType": "git"
},
{
"lessThan": "3fd225f3e4cd67ec8ddab1afed9da03c7c43537c",
"status": "affected",
"version": "4710317891e4824ce1510a6b5066abbd3e917750",
"versionType": "git"
},
{
"lessThan": "1c4ffe6b4f04365485ed58d64c9bb86b46fc9037",
"status": "affected",
"version": "4710317891e4824ce1510a6b5066abbd3e917750",
"versionType": "git"
},
{
"lessThan": "4bd8635f28c135a08aac6badcd7d9b5cdb34335f",
"status": "affected",
"version": "4710317891e4824ce1510a6b5066abbd3e917750",
"versionType": "git"
},
{
"lessThan": "5f4d2bd028ebb6e4c09a9d64842546022321d4a7",
"status": "affected",
"version": "4710317891e4824ce1510a6b5066abbd3e917750",
"versionType": "git"
},
{
"lessThan": "0526931b16e5a118d367b7bfce7d797e63f7ac69",
"status": "affected",
"version": "4710317891e4824ce1510a6b5066abbd3e917750",
"versionType": "git"
},
{
"lessThan": "6036b5067a8199ba7a2dc7b377d4b9dd276d5f9e",
"status": "affected",
"version": "4710317891e4824ce1510a6b5066abbd3e917750",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/i2c/i2c-stub.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.33"
},
{
"lessThan": "2.6.33",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.260",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.211",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.177",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.144",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.95",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.37",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.14",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.260",
"versionStartIncluding": "2.6.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.211",
"versionStartIncluding": "2.6.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.177",
"versionStartIncluding": "2.6.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.144",
"versionStartIncluding": "2.6.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.95",
"versionStartIncluding": "2.6.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.37",
"versionStartIncluding": "2.6.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.14",
"versionStartIncluding": "2.6.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1",
"versionStartIncluding": "2.6.33",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: stub: Reject I2C block transfers with invalid length\n\nThe I2C_SMBUS_I2C_BLOCK_DATA case in stub_xfer() uses data-\u003eblock[0]\nas the transfer length. The existing check only clamps it to avoid\noverrunning the chip-\u003ewords[256] register array, but does not validate\nit against I2C_SMBUS_BLOCK_MAX (32), which is the limit of the union\ni2c_smbus_data.block buffer (34 bytes total). The driver is a\ndevelopment/test tool (CONFIG_I2C_STUB=m, not built by default)\nthat must be loaded with a chip_addr= parameter.\n\nA local user with access to /dev/i2c-* can issue an I2C_SMBUS ioctl\nwith I2C_SMBUS_I2C_BLOCK_DATA and data-\u003eblock[0] \u003e 32, causing\nstub_xfer() to read or write past the end of the union\ni2c_smbus_data.block buffer:\n\n BUG: KASAN: stack-out-of-bounds in stub_xfer (drivers/i2c/i2c-stub.c:223)\n Read of size 1 at addr ffff88800abcfd92 by task exploit/81\n Call Trace:\n \u003cTASK\u003e\n stub_xfer (drivers/i2c/i2c-stub.c:223)\n __i2c_smbus_xfer (drivers/i2c/i2c-core-smbus.c:593)\n i2c_smbus_xfer (drivers/i2c/i2c-core-smbus.c:536)\n i2cdev_ioctl_smbus (drivers/i2c/i2c-dev.c:391)\n i2cdev_ioctl (drivers/i2c/i2c-dev.c:478)\n __x64_sys_ioctl (fs/ioctl.c:583)\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n \u003c/TASK\u003e\n\nThe bug exists because i2c-stub implements .smbus_xfer directly,\nbypassing the I2C_SMBUS_BLOCK_MAX validation in\ni2c_smbus_xfer_emulated(). The I2C_SMBUS_BLOCK_DATA case in the same\nfunction correctly validates against I2C_SMBUS_BLOCK_MAX, but the\nI2C_SMBUS_I2C_BLOCK_DATA case does not.\n\nFix by rejecting transfers with data-\u003eblock[0] == 0 or\ndata-\u003eblock[0] \u003e I2C_SMBUS_BLOCK_MAX with -EINVAL, consistent with\nboth the I2C_SMBUS_BLOCK_DATA case in the same function and the\nI2C_SMBUS_I2C_BLOCK_DATA validation in i2c_smbus_xfer_emulated()."
}
],
"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 - The vulnerable path is reached by a local process issuing I2C_SMBUS ioctls on an i2c-stub /dev/i2c-* character device; it is neither remotely nor physically reachable.\nAC:L - Once i2c-stub is loaded, the attacker controls the address, direction, length, and register contents, making the corruption deterministic without a race. The non-default module configuration defines the vulnerable deployment rather than complicating exploitation within it.\nPR:L - The attacker needs unprivileged local access to the applicable /dev/i2c-* node, but no capability or namespace-specific administrative privilege is checked anywhere along the ioctl path.\nUI:N - After the vulnerable adapter is configured, exploitation requires only attacker-issued ioctls and no action by another user.\nS:U - The corruption occurs within the host kernel and represents conventional local privilege escalation, without crossing a separate virtualization or hardware security authority.\nC:H - An oversized block write reads up to 222 bytes beyond the 34-byte stack union and persists those bytes in attacker-readable stub registers, enabling substantial kernel-stack disclosure.\nI:H - An oversized block read writes up to 222 attacker-chosen bytes beyond the stack union because the attacker can prepopulate the stub registers, enabling control-data corruption and potential kernel code execution.\nA:H - The controlled stack overwrite can corrupt stack canaries, return state, or other control data, causing a repeatable kernel oops or panic even when code execution is unsuccessful."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:39:59.861Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/7e9072dbd5f2f17934751873450d2c22080ead80"
},
{
"url": "https://git.kernel.org/stable/c/21e87f336ac6303fed54a69b1d0d79a23b25c8d0"
},
{
"url": "https://git.kernel.org/stable/c/3fd225f3e4cd67ec8ddab1afed9da03c7c43537c"
},
{
"url": "https://git.kernel.org/stable/c/1c4ffe6b4f04365485ed58d64c9bb86b46fc9037"
},
{
"url": "https://git.kernel.org/stable/c/4bd8635f28c135a08aac6badcd7d9b5cdb34335f"
},
{
"url": "https://git.kernel.org/stable/c/5f4d2bd028ebb6e4c09a9d64842546022321d4a7"
},
{
"url": "https://git.kernel.org/stable/c/0526931b16e5a118d367b7bfce7d797e63f7ac69"
},
{
"url": "https://git.kernel.org/stable/c/6036b5067a8199ba7a2dc7b377d4b9dd276d5f9e"
}
],
"title": "i2c: stub: Reject I2C block transfers with invalid length",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64191",
"datePublished": "2026-07-20T16:27:51.120Z",
"dateReserved": "2026-07-19T07:54:57.040Z",
"dateUpdated": "2026-08-05T12:39:59.861Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-64191",
"date": "2026-09-09",
"epss": "0.00127",
"percentile": "0.02685"
},
"microsoft_vex": {
"current_release_date": "2026-08-14T18:06:16.000Z",
"cve": "CVE-2026-64191",
"id": "msrc_CVE-2026-64191",
"initial_release_date": "2026-07-22T01:02:16.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "i2c: stub: Reject I2C block transfers with invalid length",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64191.json",
"version": "5"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-64191\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-20T17:18:22.217\",\"lastModified\":\"2026-08-11T19:05:37.520\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ni2c: stub: Reject I2C block transfers with invalid length\\n\\nThe I2C_SMBUS_I2C_BLOCK_DATA case in stub_xfer() uses data-\u003eblock[0]\\nas the transfer length. The existing check only clamps it to avoid\\noverrunning the chip-\u003ewords[256] register array, but does not validate\\nit against I2C_SMBUS_BLOCK_MAX (32), which is the limit of the union\\ni2c_smbus_data.block buffer (34 bytes total). The driver is a\\ndevelopment/test tool (CONFIG_I2C_STUB=m, not built by default)\\nthat must be loaded with a chip_addr= parameter.\\n\\nA local user with access to /dev/i2c-* can issue an I2C_SMBUS ioctl\\nwith I2C_SMBUS_I2C_BLOCK_DATA and data-\u003eblock[0] \u003e 32, causing\\nstub_xfer() to read or write past the end of the union\\ni2c_smbus_data.block buffer:\\n\\n BUG: KASAN: stack-out-of-bounds in stub_xfer (drivers/i2c/i2c-stub.c:223)\\n Read of size 1 at addr ffff88800abcfd92 by task exploit/81\\n Call Trace:\\n \u003cTASK\u003e\\n stub_xfer (drivers/i2c/i2c-stub.c:223)\\n __i2c_smbus_xfer (drivers/i2c/i2c-core-smbus.c:593)\\n i2c_smbus_xfer (drivers/i2c/i2c-core-smbus.c:536)\\n i2cdev_ioctl_smbus (drivers/i2c/i2c-dev.c:391)\\n i2cdev_ioctl (drivers/i2c/i2c-dev.c:478)\\n __x64_sys_ioctl (fs/ioctl.c:583)\\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\\n \u003c/TASK\u003e\\n\\nThe bug exists because i2c-stub implements .smbus_xfer directly,\\nbypassing the I2C_SMBUS_BLOCK_MAX validation in\\ni2c_smbus_xfer_emulated(). The I2C_SMBUS_BLOCK_DATA case in the same\\nfunction correctly validates against I2C_SMBUS_BLOCK_MAX, but the\\nI2C_SMBUS_I2C_BLOCK_DATA case does not.\\n\\nFix by rejecting transfers with data-\u003eblock[0] == 0 or\\ndata-\u003eblock[0] \u003e I2C_SMBUS_BLOCK_MAX with -EINVAL, consistent with\\nboth the I2C_SMBUS_BLOCK_DATA case in the same function and the\\nI2C_SMBUS_I2C_BLOCK_DATA validation in i2c_smbus_xfer_emulated().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/i2c/i2c-stub.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4710317891e4824ce1510a6b5066abbd3e917750\",\"lessThan\":\"7e9072dbd5f2f17934751873450d2c22080ead80\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4710317891e4824ce1510a6b5066abbd3e917750\",\"lessThan\":\"21e87f336ac6303fed54a69b1d0d79a23b25c8d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4710317891e4824ce1510a6b5066abbd3e917750\",\"lessThan\":\"3fd225f3e4cd67ec8ddab1afed9da03c7c43537c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4710317891e4824ce1510a6b5066abbd3e917750\",\"lessThan\":\"1c4ffe6b4f04365485ed58d64c9bb86b46fc9037\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4710317891e4824ce1510a6b5066abbd3e917750\",\"lessThan\":\"4bd8635f28c135a08aac6badcd7d9b5cdb34335f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4710317891e4824ce1510a6b5066abbd3e917750\",\"lessThan\":\"5f4d2bd028ebb6e4c09a9d64842546022321d4a7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4710317891e4824ce1510a6b5066abbd3e917750\",\"lessThan\":\"0526931b16e5a118d367b7bfce7d797e63f7ac69\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4710317891e4824ce1510a6b5066abbd3e917750\",\"lessThan\":\"6036b5067a8199ba7a2dc7b377d4b9dd276d5f9e\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/i2c/i2c-stub.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.33\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.33\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.37\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.14\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.33\",\"versionEndExcluding\":\"5.10.260\",\"matchCriteriaId\":\"81A5D91A-3592-4338-B21E-E0947B7A1EA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.211\",\"matchCriteriaId\":\"D71C101E-388C-4A46-BD99-49049F7C5CFF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.177\",\"matchCriteriaId\":\"333C9E30-7FD4-46A2-94EF-C1AA1F3EE28B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.144\",\"matchCriteriaId\":\"C8AD3BC8-C843-423C-B9DB-CB52F67F578E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.95\",\"matchCriteriaId\":\"4E206B86-E0E3-4394-A93F-39F2D50A8AA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.37\",\"matchCriteriaId\":\"E08ACB05-518A-4D61-A6C4-268D1BB6BF46\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.14\",\"matchCriteriaId\":\"6241DF06-E6F3-4B61-B5A2-A60F2AE5B982\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B1EF7059-E670-45F4-B422-54C40FA86390\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D38F0BF-A728-4133-A358-D44A2F7EE6D6\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0526931b16e5a118d367b7bfce7d797e63f7ac69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1c4ffe6b4f04365485ed58d64c9bb86b46fc9037\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/21e87f336ac6303fed54a69b1d0d79a23b25c8d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3fd225f3e4cd67ec8ddab1afed9da03c7c43537c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4bd8635f28c135a08aac6badcd7d9b5cdb34335f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5f4d2bd028ebb6e4c09a9d64842546022321d4a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6036b5067a8199ba7a2dc7b377d4b9dd276d5f9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7e9072dbd5f2f17934751873450d2c22080ead80\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-09T07:35:56+00:00",
"cve": "CVE-2026-64191",
"id": "CVE-2026-64191",
"initial_release_date": "2026-07-20T00:00:00+00:00",
"product_status:fixed": "930",
"product_status:known_affected": "126",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: i2c: stub: Reject I2C block transfers with invalid length",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64191.json",
"version": "3"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Loading…
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.
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.
Loading…
Loading…