FKIE_CVE-2026-74438
Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
crypto: sun4i-ss - Remove insecure and unused rng_alg
Remove sun4i_ss_rng, as it is insecure and unused:
- It has multiple vulnerabilities. sun4i_ss_prng_seed() is missing
locking and has a buffer overflow. sun4i_ss_prng_generate() fails to
fill the entire buffer with cryptographic random bytes, because it
rounds the destination length down and also doesn't actually wait for
the hardware to be ready before pulling bytes from it.
- No user of this code is known. It's usable only theoretically via the
"rng" algorithm type of AF_ALG. But userspace actually just uses the
actual Linux RNG (/dev/random etc) instead. And rng_algs don't
contribute entropy to the actual Linux RNG either. (This may have
been confused with hwrng, which does contribute entropy.)
The sun4i_ss_prng_seed() buffer overflow was reported by Tianchu Chen
and discovered by Atuin - Automated Vulnerability Discovery Engine
There's no point in fixing all these vulnerabilities individually when
this is unused code, so let's just remove it.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/arm/configs/sunxi_defconfig",
"drivers/crypto/allwinner/Kconfig",
"drivers/crypto/allwinner/sun4i-ss/Makefile",
"drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c",
"drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c",
"drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "2eafecaba1b46bb9774eaf3556619fd5b6a17c1c",
"status": "affected",
"version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
"versionType": "git"
},
{
"lessThan": "ee2458f8188732aa53a5d42f56e87bfad288b44e",
"status": "affected",
"version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
"versionType": "git"
},
{
"lessThan": "306ded31bfa00a69d25823a60d7c797170bfb4f8",
"status": "affected",
"version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
"versionType": "git"
},
{
"lessThan": "e4b7b9819811c4c51064c3d3d3c02f0be7491707",
"status": "affected",
"version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
"versionType": "git"
},
{
"lessThan": "c401492e01c7bfd38cf14c94d85c7efafe7d1a25",
"status": "affected",
"version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
"versionType": "git"
},
{
"lessThan": "9c8086d9511189c34dfa3f9e3a03f2bee12f56a5",
"status": "affected",
"version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
"versionType": "git"
},
{
"lessThan": "b2c41fa9dd8fc740c489e060b199165771f268d1",
"status": "affected",
"version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/arm/configs/sunxi_defconfig",
"drivers/crypto/allwinner/Kconfig",
"drivers/crypto/allwinner/sun4i-ss/Makefile",
"drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c",
"drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c",
"drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.14"
},
{
"lessThan": "4.14",
"status": "unaffected",
"version": "0",
"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: sun4i-ss - Remove insecure and unused rng_alg\n\nRemove sun4i_ss_rng, as it is insecure and unused:\n\n- It has multiple vulnerabilities. sun4i_ss_prng_seed() is missing\n locking and has a buffer overflow. sun4i_ss_prng_generate() fails to\n fill the entire buffer with cryptographic random bytes, because it\n rounds the destination length down and also doesn\u0027t actually wait for\n the hardware to be ready before pulling bytes from it.\n\n- No user of this code is known. It\u0027s usable only theoretically via the\n \"rng\" algorithm type of AF_ALG. But userspace actually just uses the\n actual Linux RNG (/dev/random etc) instead. And rng_algs don\u0027t\n contribute entropy to the actual Linux RNG either. (This may have\n been confused with hwrng, which does contribute entropy.)\n\nThe sun4i_ss_prng_seed() buffer overflow was reported by Tianchu Chen\nand discovered by Atuin - Automated Vulnerability Discovery Engine\n\nThere\u0027s no point in fixing all these vulnerabilities individually when\nthis is unused code, so let\u0027s just remove it."
}
],
"id": "CVE-2026-74438",
"lastModified": "2026-08-17T06:19:39.477",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T06:22:45.903",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2eafecaba1b46bb9774eaf3556619fd5b6a17c1c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/306ded31bfa00a69d25823a60d7c797170bfb4f8"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/9c8086d9511189c34dfa3f9e3a03f2bee12f56a5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b2c41fa9dd8fc740c489e060b199165771f268d1"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c401492e01c7bfd38cf14c94d85c7efafe7d1a25"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e4b7b9819811c4c51064c3d3d3c02f0be7491707"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ee2458f8188732aa53a5d42f56e87bfad288b44e"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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