CVE-2026-93159 (GCVE-0-2026-93159)
Vulnerability from cvelistv5
Published
2026-09-17 16:11
Modified
2026-10-19 09:06
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: da001fb651b00e1deeaf24767dd691ae8152a4f5
Version: da001fb651b00e1deeaf24767dd691ae8152a4f5
Version: da001fb651b00e1deeaf24767dd691ae8152a4f5
Version: da001fb651b00e1deeaf24767dd691ae8152a4f5
Version: da001fb651b00e1deeaf24767dd691ae8152a4f5
Version: da001fb651b00e1deeaf24767dd691ae8152a4f5
Version: da001fb651b00e1deeaf24767dd691ae8152a4f5
Version: da001fb651b00e1deeaf24767dd691ae8152a4f5
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: atmel-sha204a - fix heap info leak on I2C transfer failure\n\nThe nonblocking RNG path allocates a work_data structure to track the\nstate of an in-flight asynchronous I2C request. This pointer is stored\nin rng-\u003epriv and later consumed by the read path once the transaction\ncompletes.\n\nIf the underlying I2C transfer fails, the completion callback is invoked\nwith a non-zero status. In this case, the allocated work_data is not\nusable for producing RNG output and must not remain associated with the\nhwrng state.\n\nPreviously, the failure path only logged a warning but left the pointer\nstate uncleared, which can result in subsequent read attempts observing\nstale state and interpreting it as valid completion data.\n\nFix this by freeing the pending work_data. The I2C transaction reports\nan error. This ensures that failed requests do not leave residual state\nbehind that could be interpreted as valid RNG data on later reads.\nClearing rng-\u003epriv is done at the subsequent call to nonblocking read."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:06:31.352Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/4e76d85e505b7451925efbcd67c015e8c2440c68"
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        {
          "url": "https://git.kernel.org/stable/c/72bbf11ba14bd7d5fbf31a1ec42fff608b657f74"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93159",
    "datePublished": "2026-09-17T16:11:53.852Z",
    "dateReserved": "2026-09-17T16:02:15.089Z",
    "dateUpdated": "2026-10-19T09:06:31.352Z",
    "state": "PUBLISHED"
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}


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