CVE-2026-64311

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64311", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.779Z", "datePublished": "2026-07-25T08:49:43.318Z", "dateUpdated": "2026-08-17T04:53:10.994Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:53:10.994Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: loongson - Remove broken and unused loongson-rng\n\nThe loongson-rng rng_alg has several vulnerabilities, including not\nproviding forward security, and a use-after-free bug due to the use of\nwait_for_completion_interruptible().\n\nMeanwhile, the rng_alg framework doesn't really have any purpose in the\nfirst place other than to access the software algorithms crypto/drbg.c\nand crypto/jitterentropy.c. Hardware-specific rng_algs have no\nin-kernel user, and unlike hwrng there's no feed into the actual Linux\nRNG. As such, there's really no point to this code. There are of\ncourse other rng_alg drivers that are similarly unused, but they're\nsimilarly in the process of being phased out, e.g.\nhttps://lore.kernel.org/r/20260529193648.18172-1-ebiggers@kernel.org and\nhttps://lore.kernel.org/r/20260529220430.34135-1-ebiggers@kernel.org\n\nGiven that, there's no point in fixing forward these vulnerabilities,\nand it makes much more sense to simply roll back the addition of this\ndriver. If this platform provides TRNG (not PRNG) functionality, it\ncould make sense to add a hwrng driver, but it would be quite different."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - An attacker reaches the vulnerable driver through local AF_ALG socket operations selecting the \"rng\" type and \"loongson_stdrng\" algorithm. No network or physical-device input path invokes it.\nAC:L - The attacker can repeatedly issue RNG requests and interrupt the waiting thread with signals, causing the asynchronous operation to outlive the interrupted call. Both request initiation and interruption are attacker-controlled.\nPR:L - AF_ALG RNG creation, binding, acceptance, and generation require only an unprivileged local account and contain no capability check. The CAP_SYS_ADMIN check applies only to the separate CAVP entropy-testing operation.\nUI:N - The attacker can open and operate the AF_ALG sockets and deliver the signal without any action by another user.\nS:U - Exploitation compromises the host kernel within the same security authority; this is ordinary local privilege escalation rather than a VM, IOMMU, or other scope-boundary escape.\nC:H - The documented use-after-free can permit attacker-controlled memory reuse and disclosure of arbitrary kernel or process-sensitive memory.\nI:H - The use-after-free and outstanding asynchronous engine operation constitute exploitable memory corruption that can potentially provide arbitrary writes or kernel control-flow hijacking.\nA:H - Use-after-free access or corruption during asynchronous completion can cause a kernel oops, panic, or complete system crash."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["MAINTAINERS", "arch/loongarch/configs/loongson32_defconfig", "arch/loongarch/configs/loongson64_defconfig", "drivers/crypto/Kconfig", "drivers/crypto/Makefile", "drivers/crypto/loongson/Kconfig", "drivers/crypto/loongson/Makefile", "drivers/crypto/loongson/loongson-rng.c"], "versions": [{"version": "766b2d724c8df071031412eea902b566a0049c31", "lessThan": "037ec8353711c79353b12d5634e0c9ff363a9efa", "status": "affected", "versionType": "git"}, {"version": "766b2d724c8df071031412eea902b566a0049c31", "lessThan": "43de8b9f01b7dd2f6ca5360c6bf2f203c02288dc", "status": "affected", "versionType": "git"}, {"version": "766b2d724c8df071031412eea902b566a0049c31", "lessThan": "af3d1bb9a09daf928fc3f173689fb7904d6a6d4f", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["MAINTAINERS", "arch/loongarch/configs/loongson32_defconfig", "arch/loongarch/configs/loongson64_defconfig", "drivers/crypto/Kconfig", "drivers/crypto/Makefile", "drivers/crypto/loongson/Kconfig", "drivers/crypto/loongson/Makefile", "drivers/crypto/loongson/loongson-rng.c"], "versions": [{"version": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "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": "6.18", "versionEndExcluding": "6.18.39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/037ec8353711c79353b12d5634e0c9ff363a9efa"}, {"url": "https://git.kernel.org/stable/c/43de8b9f01b7dd2f6ca5360c6bf2f203c02288dc"}, {"url": "https://git.kernel.org/stable/c/af3d1bb9a09daf928fc3f173689fb7904d6a6d4f"}], "title": "crypto: loongson - Remove broken and unused loongson-rng", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["MAINTAINERS", "arch/loongarch/configs/loongson32_defconfig", "arch/loongarch/configs/loongson64_defconfig", "drivers/crypto/Kconfig", "drivers/crypto/Makefile", "drivers/crypto/loongson/Kconfig", "drivers/crypto/loongson/Makefile", "drivers/crypto/loongson/loongson-rng.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "037ec8353711c79353b12d5634e0c9ff363a9efa", "status": "affected", "version": "766b2d724c8df071031412eea902b566a0049c31", "versionType": "git"}, {"lessThan": "43de8b9f01b7dd2f6ca5360c6bf2f203c02288dc", "status": "affected", "version": "766b2d724c8df071031412eea902b566a0049c31", "versionType": "git"}, {"lessThan": "af3d1bb9a09daf928fc3f173689fb7904d6a6d4f", "status": "affected", "version": "766b2d724c8df071031412eea902b566a0049c31", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["MAINTAINERS", "arch/loongarch/configs/loongson32_defconfig", "arch/loongarch/configs/loongson64_defconfig", "drivers/crypto/Kconfig", "drivers/crypto/Makefile", "drivers/crypto/loongson/Kconfig", "drivers/crypto/loongson/Makefile", "drivers/crypto/loongson/loongson-rng.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"lessThan": "6.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.39", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CA2CE3BD-0548-4984-8C39-F3D3DF4D64E1", "versionEndExcluding": "6.18.39", "versionStartIncluding": "6.18", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6228DDD6-4557-4AA3-9F43-AB995D471E42", "versionEndExcluding": "7.1.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: loongson - Remove broken and unused loongson-rng\n\nThe loongson-rng rng_alg has several vulnerabilities, including not\nproviding forward security, and a use-after-free bug due to the use of\nwait_for_completion_interruptible().\n\nMeanwhile, the rng_alg framework doesn't really have any purpose in the\nfirst place other than to access the software algorithms crypto/drbg.c\nand crypto/jitterentropy.c. Hardware-specific rng_algs have no\nin-kernel user, and unlike hwrng there's no feed into the actual Linux\nRNG. As such, there's really no point to this code. There are of\ncourse other rng_alg drivers that are similarly unused, but they're\nsimilarly in the process of being phased out, e.g.\nhttps://lore.kernel.org/r/20260529193648.18172-1-ebiggers@kernel.org and\nhttps://lore.kernel.org/r/20260529220430.34135-1-ebiggers@kernel.org\n\nGiven that, there's no point in fixing forward these vulnerabilities,\nand it makes much more sense to simply roll back the addition of this\ndriver. If this platform provides TRNG (not PRNG) functionality, it\ncould make sense to add a hwrng driver, but it would be quite different."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: loongson - Eliminar loongson-rng roto y sin usar\n\nEl rng_alg loongson-rng tiene varias vulnerabilidades, incluyendo no proporcionar seguridad hacia adelante, y un error de uso despu\u00e9s de liberaci\u00f3n debido al uso de wait_for_completion_interruptible().\n\nMientras tanto, el framework rng_alg realmente no tiene ning\u00fan prop\u00f3sito en primer lugar aparte de acceder a los algoritmos de software crypto/drbg.c y crypto/jitterentropy.c. Los rng_algs espec\u00edficos de hardware no tienen un usuario en el kernel, y a diferencia de hwrng no hay alimentaci\u00f3n al RNG de Linux real. Como tal, realmente no tiene sentido este c\u00f3digo. Hay, por supuesto, otros controladores rng_alg que est\u00e1n igualmente sin usar, pero est\u00e1n igualmente en proceso de ser eliminados gradualmente, p. ej. https://lore.kernel.org/r/20260529193648.18172-1-ebiggers@kernel.org y https://lore.kernel.org/r/20260529220430.34135-1-ebiggers@kernel.org\n\nDado eso, no tiene sentido corregir hacia adelante estas vulnerabilidades, y tiene mucho m\u00e1s sentido simplemente revertir la adici\u00f3n de este controlador. Si esta plataforma proporciona funcionalidad TRNG (no PRNG), podr\u00eda tener sentido a\u00f1adir un controlador hwrng, pero ser\u00eda bastante diferente."}], "id": "CVE-2026-64311", "lastModified": "2026-10-24T13:10:00.147", "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": "2026-07-25T10:17:12.263", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/037ec8353711c79353b12d5634e0c9ff363a9efa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/43de8b9f01b7dd2f6ca5360c6bf2f203c02288dc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af3d1bb9a09daf928fc3f173689fb7904d6a6d4f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: crypto: loongson - Remove broken and unused loongson-rng", "id": "2507223", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507223"}, "csaw": false, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's `loongson-rng` random number generator. This component suffered from a use-after-free vulnerability, which could lead to system instability or denial of service. Additionally, the `loongson-rng` did not provide forward security, a crucial cryptographic property. Due to these security weaknesses and its limited utility, the `loongson-rng` driver has been removed from the kernel."], "name": "CVE-2026-64311", "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": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64311\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64311\nhttps://lore.kernel.org/linux-cve-announce/2026072509-CVE-2026-64311-f537@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[766b2d724c8df071031412eea902b566a0049c31,037ec8353711c79353b12d5634e0c9ff363a9efa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[766b2d724c8df071031412eea902b566a0049c31,43de8b9f01b7dd2f6ca5360c6bf2f203c02288dc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[766b2d724c8df071031412eea902b566a0049c31,af3d1bb9a09daf928fc3f173689fb7904d6a6d4f)"}}], "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": "6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"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": "2026-07-25T15:15:04.506632+00:00", "updated": "2026-09-03T22:00:13.822837+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}