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NVD / CVE Program· CNA Linux

CVE-2026-74402: crypto: atmel-sha204a - fix blocking and non-blocking rng logic

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 2fa302bbc62dec7cb6339c9494e0e3f2f884afeb, 319400fc5ee15db5793aa45f854968141326effc, 76269a91fd9560c5f03c3e59421a0329e39a6661.

Low priority for now. Upgrade to Linux Linux 2fa302bbc62dec7cb6339c9494e0e3f2f884afeb, 319400fc5ee15db5793aa45f854968141326effc, 76269a91fd9560c5f03c3e59421a0329e39a6661 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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

—No exploit Fix available
Published
Aug 15, 2026
Updated
Aug 17, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.3affected
    • da001fb651b00e1deeaf24767dd691ae8152a4f5 and later · before 76269a91fd9560c5f03c3e59421a0329e39a6661affected · git
    • da001fb651b00e1deeaf24767dd691ae8152a4f5 and later · before 9039bb4f238474379221fc933c34f19f0cba501baffected · git
    • da001fb651b00e1deeaf24767dd691ae8152a4f5 and later · before d4aa6141ff03ec82eed6fcef814300fb855ce5d8affected · git
    • da001fb651b00e1deeaf24767dd691ae8152a4f5 and later · before e833e865e4944ba75120db534bd931db6cf677d3affected · git
    • da001fb651b00e1deeaf24767dd691ae8152a4f5 and later · before 2fa302bbc62dec7cb6339c9494e0e3f2f884afebaffected · git
    • da001fb651b00e1deeaf24767dd691ae8152a4f5 and later · before aac63bbea8fd5a34f1a4305cb73369068f952d32affected · git
    • da001fb651b00e1deeaf24767dd691ae8152a4f5 and later · before 938ae1fb4a8f5db43b62b6206d409efbf317f0d9affected · git
    • da001fb651b00e1deeaf24767dd691ae8152a4f5 and later · before 319400fc5ee15db5793aa45f854968141326effcaffected · git
    • before 5.3not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74399Aug 15, 2026 · evm: terminate and bound the evm_xattrs read buffer
    0Monitor
  • ← EarlierCVE-2026-74400Aug 15, 2026 · bpf: fix crash in bpf_[set|remove]_dentry_xattr for negative dentries
    0Monitor
  • Later →CVE-2026-74403Aug 15, 2026 · crypto: ccp - Check for page allocation failure correctly in TIO
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2fa302bbc62dec7cb6339c9494e0e3f2f884afebVendor (CNA)
Linux Linux319400fc5ee15db5793aa45f854968141326effcVendor (CNA)
Linux Linux76269a91fd9560c5f03c3e59421a0329e39a6661Vendor (CNA)
Linux Linux9039bb4f238474379221fc933c34f19f0cba501bVendor (CNA)
Linux Linux938ae1fb4a8f5db43b62b6206d409efbf317f0d9Vendor (CNA)
Linux Linuxaac63bbea8fd5a34f1a4305cb73369068f952d32Vendor (CNA)
Linux Linuxd4aa6141ff03ec82eed6fcef814300fb855ce5d8Vendor (CNA)
Linux Linuxe833e865e4944ba75120db534bd931db6cf677d3Vendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records