In the Linux kernel, the following vulnerability has been resolved:
crypto: atmel-sha204a - fix heap info leak on I2C transfer failure
The nonblocking RNG path allocates a work_data structure to track the
state of an in-flight asynchronous I2C request. This pointer is stored
in rng->priv and later consumed by the read path once the transaction
completes.
If the underlying I2C transfer fails, the completion callback is invoked
with a non-zero status. In this case, the allocated work_data is not
usable for producing RNG output and must not remain associated with the
hwrng state.
Previously, the failure path only logged a warning but left the pointer
state uncleared, which can result in subsequent read attempts observing
stale state and interpreting it as valid completion data.
Fix this by freeing the pending work_data. The I2C transaction reports
an error. This ensures that failed requests do not leave residual state
behind that could be interpreted as valid RNG data on later reads.
Clearing rng->priv is done at the subsequent call to nonblocking read.
crypto: atmel-sha204a - fix heap info leak on I2C transfer failure
The nonblocking RNG path allocates a work_data structure to track the
state of an in-flight asynchronous I2C request. This pointer is stored
in rng->priv and later consumed by the read path once the transaction
completes.
If the underlying I2C transfer fails, the completion callback is invoked
with a non-zero status. In this case, the allocated work_data is not
usable for producing RNG output and must not remain associated with the
hwrng state.
Previously, the failure path only logged a warning but left the pointer
state uncleared, which can result in subsequent read attempts observing
stale state and interpreting it as valid completion data.
Fix this by freeing the pending work_data. The I2C transaction reports
an error. This ensures that failed requests do not leave residual state
behind that could be interpreted as valid RNG data on later reads.
Clearing rng->priv is done at the subsequent call to nonblocking read.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Thu, 17 Sep 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: crypto: atmel-sha204a - fix heap info leak on I2C transfer failure The nonblocking RNG path allocates a work_data structure to track the state of an in-flight asynchronous I2C request. This pointer is stored in rng->priv and later consumed by the read path once the transaction completes. If the underlying I2C transfer fails, the completion callback is invoked with a non-zero status. In this case, the allocated work_data is not usable for producing RNG output and must not remain associated with the hwrng state. Previously, the failure path only logged a warning but left the pointer state uncleared, which can result in subsequent read attempts observing stale state and interpreting it as valid completion data. Fix this by freeing the pending work_data. The I2C transaction reports an error. This ensures that failed requests do not leave residual state behind that could be interpreted as valid RNG data on later reads. Clearing rng->priv is done at the subsequent call to nonblocking read. | |
| Title | crypto: atmel-sha204a - fix heap info leak on I2C transfer failure | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
Projects
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-09-17T16:11:53.852Z
Reserved: 2026-09-17T16:02:15.089Z
Link: CVE-2026-93159
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-17T17:18:11.277
Modified: 2026-09-17T17:18:11.277
Link: CVE-2026-93159
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.