CVE-2026-74402 (GCVE-0-2026-74402)
Vulnerability from cvelistv5
Published
2026-08-15 05:59
Modified
2026-08-17 05:18
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
crypto: atmel-sha204a - fix blocking and non-blocking rng logic
The blocking and non-blocking paths were failing to provide valid entropy
due to improper buffer management. Reading the buffer starting from byte 1,
only fetch the 32 bytes of random data from the return message.
Tested on an Atmel SHA204A device.
Before (here for blocking), tests showed repeatedly reading reduced bytes.
$ head -c 32 /dev/hwrng | hexdump -C
00000000 02 28 85 b3 47 40 f2 ee 00 00 00 00 00 00 00 00 |.(..G@..........|
00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000020
After, the result will be similar to the following:
$ head -c 32 /dev/hwrng | hexdump -C
00000000 5a fc 3f 13 14 68 fe 06 68 0a bd 04 83 6e 09 69 |Z.?..h..h....n.i|
00000010 75 ff cf 87 10 84 3b c9 c1 df ae eb 45 53 4c c3 |u.....;.....ESL.|
00000020
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": [
{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: atmel-sha204a - fix blocking and non-blocking rng logic\n\nThe blocking and non-blocking paths were failing to provide valid entropy\ndue to improper buffer management. Reading the buffer starting from byte 1,\nonly fetch the 32 bytes of random data from the return message.\n\nTested on an Atmel SHA204A device.\n\nBefore (here for blocking), tests showed repeatedly reading reduced bytes.\n$ head -c 32 /dev/hwrng | hexdump -C\n00000000 02 28 85 b3 47 40 f2 ee 00 00 00 00 00 00 00 00 |.(..G@..........|\n00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|\n00000020\n\nAfter, the result will be similar to the following:\n$ head -c 32 /dev/hwrng | hexdump -C\n00000000 5a fc 3f 13 14 68 fe 06 68 0a bd 04 83 6e 09 69 |Z.?..h..h....n.i|\n00000010 75 ff cf 87 10 84 3b c9 c1 df ae eb 45 53 4c c3 |u.....;.....ESL.|\n00000020"
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:18:42.284Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"references": [
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"url": "https://git.kernel.org/stable/c/76269a91fd9560c5f03c3e59421a0329e39a6661"
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{
"url": "https://git.kernel.org/stable/c/e833e865e4944ba75120db534bd931db6cf677d3"
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"url": "https://git.kernel.org/stable/c/2fa302bbc62dec7cb6339c9494e0e3f2f884afeb"
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{
"url": "https://git.kernel.org/stable/c/aac63bbea8fd5a34f1a4305cb73369068f952d32"
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"url": "https://git.kernel.org/stable/c/938ae1fb4a8f5db43b62b6206d409efbf317f0d9"
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{
"url": "https://git.kernel.org/stable/c/319400fc5ee15db5793aa45f854968141326effc"
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],
"title": "crypto: atmel-sha204a - fix blocking and non-blocking rng logic",
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-74402",
"datePublished": "2026-08-15T05:59:12.747Z",
"dateReserved": "2026-08-15T05:44:03.892Z",
"dateUpdated": "2026-08-17T05:18:42.284Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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