Bug 2439896 (CVE-2026-23197)

Summary: CVE-2026-23197 kernel: Linux kernel i2c-imx driver: Denial of Service via invalid I2C block data length handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's i2c-imx driver. A local attacker could exploit a vulnerability in the block data length handler. When an I2C block read returns an invalid length, the system enters an endless read loop, leading to buffer overruns and a system crash, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-02-14 17:01:58 UTC 
In the Linux kernel, the following vulnerability has been resolved:

i2c: imx: preserve error state in block data length handler

When a block read returns an invalid length, zero or >I2C_SMBUS_BLOCK_MAX,
the length handler sets the state to IMX_I2C_STATE_FAILED. However,
i2c_imx_master_isr() unconditionally overwrites this with
IMX_I2C_STATE_READ_CONTINUE, causing an endless read loop that overruns
buffers and crashes the system.

Guard the state transition to preserve error states set by the length
handler.
Comment 1 Alexander B 2026-02-16 15:27:42 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021435-CVE-2026-23197-59da@gregkh/T