Bug 2390395 (CVE-2025-38671)

Summary: CVE-2025-38671 kernel: Linux kernel (i2c: qup): Denial of Service via improper I2C client timeout handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's Inter-Integrated Circuit (I2C) Qualcomm Unified Peripheral (QUP) driver. A local attacker, by using a malicious or buggy I2C client, could exploit improper timeout handling. This could lead to the kernel hanging, resulting in a Denial of Service (DoS) for the affected system.
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Description OSIDB Bzimport 2025-08-22 17:04:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

i2c: qup: jump out of the loop in case of timeout

Original logic only sets the return value but doesn't jump out of the
loop if the bus is kept active by a client. This is not expected. A
malicious or buggy i2c client can hang the kernel in this case and
should be avoided. This is observed during a long time test with a
PCA953x GPIO extender.

Fix it by changing the logic to not only sets the return value, but also
jumps out of the loop and return to the caller with -ETIMEDOUT.
Comment 1 TEJ RATHI 2025-08-25 04:59:29 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025082201-CVE-2025-38671-80a3@gregkh/T