CVE-2026-74402
crypto: atmel-sha204a - fix blocking and non-blocking rng logic
Description
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
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 15, 2026, 6:22 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-74402
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to the latest version.
- Apply the patch for atmel-sha204a RNG logic.
- Ensure buffer management is correctly implemented.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74402.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74402 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74402
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74402 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74402 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'da001fb651b00e1deeaf24767dd691ae8152a4f5', 'lessThan': '76269a91fd9560c5f03c3e59421a0329e39a6661', 'versionType': 'git'}, {'status': 'affected', 'version': 'da001fb651b00e1deeaf24767dd691ae8152a4f5', 'lessThan': '9039bb4f238474379221fc933c34f19f0cba501b', 'versionType': 'git'}, {'status': 'affected', 'version': 'da001fb651b00e1deeaf24767dd691ae8152a4f5', 'lessThan': 'd4aa6141ff03ec82eed6fcef814300fb855ce5d8', 'versionType': 'git'}, {'status': 'affected', 'version': 'da001fb651b00e1deeaf24767dd691ae8152a4f5', 'lessThan': 'e833e865e4944ba75120db534bd931db6cf677d3', 'versionType': 'git'}, {'status': 'affected', 'version': 'da001fb651b00e1deeaf24767dd691ae8152a4f5', 'lessThan': '2fa302bbc62dec7cb6339c9494e0e3f2f884afeb', 'versionType': 'git'}, {'status': 'affected', 'version': 'da001fb651b00e1deeaf24767dd691ae8152a4f5', 'lessThan': 'aac63bbea8fd5a34f1a4305cb73369068f952d32', 'versionType': 'git'}, {'status': 'affected', 'version': 'da001fb651b00e1deeaf24767dd691ae8152a4f5', 'lessThan': '938ae1fb4a8f5db43b62b6206d409efbf317f0d9', 'versionType': 'git'}, {'status': 'affected', 'version': 'da001fb651b00e1deeaf24767dd691ae8152a4f5', 'lessThan': '319400fc5ee15db5793aa45f854968141326effc', 'versionType': 'git'}], 'programFiles': ['drivers/crypto/atmel-sha204a.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.3'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.3', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/crypto/atmel-sha204a.c'], 'defaultStatus': 'affected'}] Added Description 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 Added Reference https://git.kernel.org/stable/c/2fa302bbc62dec7cb6339c9494e0e3f2f884afeb Added Reference https://git.kernel.org/stable/c/319400fc5ee15db5793aa45f854968141326effc Added Reference https://git.kernel.org/stable/c/76269a91fd9560c5f03c3e59421a0329e39a6661 Added Reference https://git.kernel.org/stable/c/9039bb4f238474379221fc933c34f19f0cba501b Added Reference https://git.kernel.org/stable/c/938ae1fb4a8f5db43b62b6206d409efbf317f0d9 Added Reference https://git.kernel.org/stable/c/aac63bbea8fd5a34f1a4305cb73369068f952d32 Added Reference https://git.kernel.org/stable/c/d4aa6141ff03ec82eed6fcef814300fb855ce5d8 Added Reference https://git.kernel.org/stable/c/e833e865e4944ba75120db534bd931db6cf677d3