CVE-2026-74402

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74402", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.892Z", "datePublished": "2026-08-15T05:59:12.747Z", "dateUpdated": "2026-08-17T05:18:42.284Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:18:42.284Z"}, "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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/crypto/atmel-sha204a.c"], "versions": [{"version": "da001fb651b00e1deeaf24767dd691ae8152a4f5", "lessThan": "76269a91fd9560c5f03c3e59421a0329e39a6661", "status": "affected", "versionType": "git"}, {"version": "da001fb651b00e1deeaf24767dd691ae8152a4f5", "lessThan": "9039bb4f238474379221fc933c34f19f0cba501b", "status": "affected", "versionType": "git"}, {"version": "da001fb651b00e1deeaf24767dd691ae8152a4f5", "lessThan": "d4aa6141ff03ec82eed6fcef814300fb855ce5d8", "status": "affected", "versionType": "git"}, {"version": "da001fb651b00e1deeaf24767dd691ae8152a4f5", "lessThan": "e833e865e4944ba75120db534bd931db6cf677d3", "status": "affected", "versionType": "git"}, {"version": "da001fb651b00e1deeaf24767dd691ae8152a4f5", "lessThan": "2fa302bbc62dec7cb6339c9494e0e3f2f884afeb", "status": "affected", "versionType": "git"}, {"version": "da001fb651b00e1deeaf24767dd691ae8152a4f5", "lessThan": "aac63bbea8fd5a34f1a4305cb73369068f952d32", "status": "affected", "versionType": "git"}, {"version": "da001fb651b00e1deeaf24767dd691ae8152a4f5", "lessThan": "938ae1fb4a8f5db43b62b6206d409efbf317f0d9", "status": "affected", "versionType": "git"}, {"version": "da001fb651b00e1deeaf24767dd691ae8152a4f5", "lessThan": "319400fc5ee15db5793aa45f854968141326effc", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/crypto/atmel-sha204a.c"], "versions": [{"version": "5.3", "status": "affected"}, {"version": "0", "lessThan": "5.3", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "7.2"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "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"}], "id": "CVE-2026-74402", "lastModified": "2026-08-17T06:19:35.390", "metrics": {}, "published": "2026-08-15T06:22:42.220", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: crypto: atmel-sha204a - fix blocking and non-blocking rng logic", "id": "2516851", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516851"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-331", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncrypto: atmel-sha204a - fix blocking and non-blocking rng logic\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.\nTested on an Atmel SHA204A device.\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\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", "A flaw was found in the Linux kernel's `atmel-sha204a` cryptographic hardware random number generator (HWRNG) driver. Improper buffer management in both blocking and non-blocking paths causes the driver to fail in providing valid entropy. This occurs because the buffer is read starting from byte 1, and only a partial amount of random data is fetched from the return message. Consequently, cryptographic operations relying on this hardware random number generator may be weakened due to insufficient randomness."], "name": "CVE-2026-74402", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74402\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74402\nhttps://lore.kernel.org/linux-cve-announce/2026081509-CVE-2026-74402-32c4@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[da001fb651b00e1deeaf24767dd691ae8152a4f5,76269a91fd9560c5f03c3e59421a0329e39a6661)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[da001fb651b00e1deeaf24767dd691ae8152a4f5,9039bb4f238474379221fc933c34f19f0cba501b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[da001fb651b00e1deeaf24767dd691ae8152a4f5,d4aa6141ff03ec82eed6fcef814300fb855ce5d8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[da001fb651b00e1deeaf24767dd691ae8152a4f5,e833e865e4944ba75120db534bd931db6cf677d3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[da001fb651b00e1deeaf24767dd691ae8152a4f5,2fa302bbc62dec7cb6339c9494e0e3f2f884afeb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[da001fb651b00e1deeaf24767dd691ae8152a4f5,aac63bbea8fd5a34f1a4305cb73369068f952d32)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[da001fb651b00e1deeaf24767dd691ae8152a4f5,938ae1fb4a8f5db43b62b6206d409efbf317f0d9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[da001fb651b00e1deeaf24767dd691ae8152a4f5,319400fc5ee15db5793aa45f854968141326effc)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.3"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.3)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.261,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T13:15:03.217306+00:00", "updated": "2026-08-21T23:45:03.458399+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}