GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-74402 (GCVE-0-2026-74402)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:18
VLAI
Title
crypto: atmel-sha204a - fix blocking and non-blocking rng logic
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
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: da001fb651b00e1deeaf24767dd691ae8152a4f5 , < 76269a91fd9560c5f03c3e59421a0329e39a6661 (git)
Affected: da001fb651b00e1deeaf24767dd691ae8152a4f5 , < 9039bb4f238474379221fc933c34f19f0cba501b (git)
Affected: da001fb651b00e1deeaf24767dd691ae8152a4f5 , < d4aa6141ff03ec82eed6fcef814300fb855ce5d8 (git)
Affected: da001fb651b00e1deeaf24767dd691ae8152a4f5 , < e833e865e4944ba75120db534bd931db6cf677d3 (git)
Affected: da001fb651b00e1deeaf24767dd691ae8152a4f5 , < 2fa302bbc62dec7cb6339c9494e0e3f2f884afeb (git)
Affected: da001fb651b00e1deeaf24767dd691ae8152a4f5 , < aac63bbea8fd5a34f1a4305cb73369068f952d32 (git)
Affected: da001fb651b00e1deeaf24767dd691ae8152a4f5 , < 938ae1fb4a8f5db43b62b6206d409efbf317f0d9 (git)
Affected: da001fb651b00e1deeaf24767dd691ae8152a4f5 , < 319400fc5ee15db5793aa45f854968141326effc (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/crypto/atmel-sha204a.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "76269a91fd9560c5f03c3e59421a0329e39a6661",
              "status": "affected",
              "version": "da001fb651b00e1deeaf24767dd691ae8152a4f5",
              "versionType": "git"
            },
            {
              "lessThan": "9039bb4f238474379221fc933c34f19f0cba501b",
              "status": "affected",
              "version": "da001fb651b00e1deeaf24767dd691ae8152a4f5",
              "versionType": "git"
            },
            {
              "lessThan": "d4aa6141ff03ec82eed6fcef814300fb855ce5d8",
              "status": "affected",
              "version": "da001fb651b00e1deeaf24767dd691ae8152a4f5",
              "versionType": "git"
            },
            {
              "lessThan": "e833e865e4944ba75120db534bd931db6cf677d3",
              "status": "affected",
              "version": "da001fb651b00e1deeaf24767dd691ae8152a4f5",
              "versionType": "git"
            },
            {
              "lessThan": "2fa302bbc62dec7cb6339c9494e0e3f2f884afeb",
              "status": "affected",
              "version": "da001fb651b00e1deeaf24767dd691ae8152a4f5",
              "versionType": "git"
            },
            {
              "lessThan": "aac63bbea8fd5a34f1a4305cb73369068f952d32",
              "status": "affected",
              "version": "da001fb651b00e1deeaf24767dd691ae8152a4f5",
              "versionType": "git"
            },
            {
              "lessThan": "938ae1fb4a8f5db43b62b6206d409efbf317f0d9",
              "status": "affected",
              "version": "da001fb651b00e1deeaf24767dd691ae8152a4f5",
              "versionType": "git"
            },
            {
              "lessThan": "319400fc5ee15db5793aa45f854968141326effc",
              "status": "affected",
              "version": "da001fb651b00e1deeaf24767dd691ae8152a4f5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/crypto/atmel-sha204a.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/76269a91fd9560c5f03c3e59421a0329e39a6661"
        },
        {
          "url": "https://git.kernel.org/stable/c/9039bb4f238474379221fc933c34f19f0cba501b"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4aa6141ff03ec82eed6fcef814300fb855ce5d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/e833e865e4944ba75120db534bd931db6cf677d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/2fa302bbc62dec7cb6339c9494e0e3f2f884afeb"
        },
        {
          "url": "https://git.kernel.org/stable/c/aac63bbea8fd5a34f1a4305cb73369068f952d32"
        },
        {
          "url": "https://git.kernel.org/stable/c/938ae1fb4a8f5db43b62b6206d409efbf317f0d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/319400fc5ee15db5793aa45f854968141326effc"
        }
      ],
      "title": "crypto: atmel-sha204a - fix blocking and non-blocking rng logic",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74402",
      "date": "2026-09-05",
      "epss": "0.00177",
      "percentile": "0.07349"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74402\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:42.220\",\"lastModified\":\"2026-08-17T06:19:35.390\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/crypto/atmel-sha204a.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/crypto/atmel-sha204a.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2fa302bbc62dec7cb6339c9494e0e3f2f884afeb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/319400fc5ee15db5793aa45f854968141326effc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/76269a91fd9560c5f03c3e59421a0329e39a6661\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9039bb4f238474379221fc933c34f19f0cba501b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/938ae1fb4a8f5db43b62b6206d409efbf317f0d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aac63bbea8fd5a34f1a4305cb73369068f952d32\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d4aa6141ff03ec82eed6fcef814300fb855ce5d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e833e865e4944ba75120db534bd931db6cf677d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T12:44:47+00:00",
      "cve": "CVE-2026-74402",
      "id": "CVE-2026-74402",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crypto: atmel-sha204a - fix blocking and non-blocking rng logic",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74402.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.