CVE-2025-38425 (GCVE-0-2025-38425)
Vulnerability from cvelistv5
Published
2025-07-25 14:16
Modified
2026-08-05 12:01
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: i2c: tegra: check msg length in SMBUS block read For SMBUS block read, do not continue to read if the message length passed from the device is '0' or greater than the maximum allowed bytes.
References
Impacted products
Vendor Product Version
Linux Linux Version: d7583c8a57485da19feb6dd85573763a8c5ec1d1
Version: d7583c8a57485da19feb6dd85573763a8c5ec1d1
Version: d7583c8a57485da19feb6dd85573763a8c5ec1d1
Version: d7583c8a57485da19feb6dd85573763a8c5ec1d1
Version: d7583c8a57485da19feb6dd85573763a8c5ec1d1
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: tegra: check msg length in SMBUS block read\n\nFor SMBUS block read, do not continue to read if the message length\npassed from the device is \u00270\u0027 or greater than the maximum allowed bytes."
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              "value": "AV:L - The overflow is driven through `/dev/i2c-N` `I2C_RDWR`/`I2C_SMBUS` ioctls (or an in-kernel SMBus block read), which require local system access rather than a network path. `i2c-dev` performs no capability check, so the ioctl entry point is available to any local process holding the device node.\nAC:L - The attacker chooses the slave address and command byte, and any device that returns a first byte above 33 \u2014 extremely common (`0xFF` from an unimplemented register, or an on-board EEPROM the attacker can pre-write over the same interface) \u2014 triggers it deterministically on every attempt. There is no race, no timing window, and no reliance on memory layout the attacker cannot groom.\nPR:L - No capability or namespace privilege is checked anywhere on the path; the attacker only needs a local account with access to the i2c character device (typically supplementary group `i2c`, and world-accessible on many Tegra/Android/Jetson vendor images). Real root in the init namespace is not required.\nUI:N - The attacker performs the entire sequence with its own ioctl calls against the i2c device node. No victim action, mount, or file open is needed.\nS:U - The corruption occurs in kernel slab memory belonging to the same kernel security authority the attacker is already interacting with. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - `i2cdev_ioctl_rdwr()` copies back the driver-inflated length, leaking up to ~220 bytes of adjacent kernel heap contents directly to userspace via `copy_to_user`. Combined with the slab overwrite primitive this yields effectively arbitrary kernel memory disclosure.\nI:H - Up to 255 bytes are written into a 34-byte `kmalloc-64` object, overflowing roughly 190\u2013220 bytes with contents fully controlled by the I2C device (which the attacker can supply or pre-program). That is a controlled-length, controlled-content slab overflow suitable for corrupting adjacent objects and hijacking control flow.\nA:H - Overwriting neighbouring slab objects reliably produces KASAN reports, slab corruption BUGs, and kernel panics even when exploitation for code execution fails. The unvalidated zero-length case additionally drives a degenerate transfer that stalls the controller."
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      "title": "i2c: tegra: check msg length in SMBUS block read",
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    "cveId": "CVE-2025-38425",
    "datePublished": "2025-07-25T14:16:45.661Z",
    "dateReserved": "2025-04-16T04:51:24.015Z",
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