CVE-2026-43033

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This requires local syscall access rather than remote packets directly reaching the bad branch.\nAC:L - The attacker controls the AF_ALG request buffers, associated-data length, operation type, key, and authsize, and no race or hard-to-influence state is required. The fault occurs before ICV verification, so a valid packet/tag is not needed.\nPR:L - AF_ALG socket creation, bind, key setup, and AEAD decrypt do not require CAP_NET_ADMIN or CAP_SYS_ADMIN, but the attacker needs local unprivileged code execution. XFRM state management is privileged, but the lower-privilege AF_ALG path reaches the bug.\nUI:N - No victim action is required once the local attacker runs the AF_ALG syscall sequence. The attacker supplies both input and output buffers directly.\nS:U - The vulnerability is in kernel crypto processing and impacts the same kernel security authority. It does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The bug is a kernel memory-corruption condition from writing ESN high sequence bytes past the intended out-of-place destination; successful exploitation of such corruption could expose arbitrary kernel memory. Under the required uncertainty rule, this is scored as high confidentiality impact.\nI:H - The vulnerable code performs an attacker-influenced out-of-bounds write of four bytes before authentication succeeds. Kernel out-of-bounds writes are scored as high integrity impact because they can plausibly be shaped into control-flow or data corruption.\nA:H - At minimum, the AF_ALG path can drive scatterwalk past the end of the destination scatterlist and crash the kernel. A local attacker can repeat the trigger without authentication, causing high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["crypto/authencesn.c"], "versions": [{"version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "8c62f618576519dbed6816fafc623ce592953025", "status": "affected", "versionType": "git"}, {"version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "d589abd8b019b07075fda255ceab8c8e950cdb3f", "status": "affected", "versionType": "git"}, {"version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "5466e7d0cd9e4f9cef9d8f18f18b60e7bc1c77e5", "status": "affected", "versionType": "git"}, {"version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "d0c4ff6812386880f30bc64c2921299cc4d7b47f", "status": "affected", "versionType": "git"}, {"version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "89fe118b6470119b20c04afc36e45b81a69ea11f", "status": "affected", "versionType": "git"}, {"version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "153d5520c3f9fd62e71c7e7f9e34b59cf411e555", "status": "affected", "versionType": "git"}, {"version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "cded4002d22177e8deaca1f257ecd932c9582b6b", "status": "affected", "versionType": "git"}, {"version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "e02494114ebf7c8b42777c6cd6982f113bfdbec7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["crypto/authencesn.c"], "versions": [{"version": "4.3", "status": "affected"}, {"version": "0", "lessThan": "4.3", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.254", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.204", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.170", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.137", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.85", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "4.3", "versionEndExcluding": "5.10.254"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "5.15.204"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "6.1.170"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "6.6.137"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "6.12.85"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8c62f618576519dbed6816fafc623ce592953025"}, {"url": "https://git.kernel.org/stable/c/d589abd8b019b07075fda255ceab8c8e950cdb3f"}, {"url": "https://git.kernel.org/stable/c/5466e7d0cd9e4f9cef9d8f18f18b60e7bc1c77e5"}, {"url": "https://git.kernel.org/stable/c/d0c4ff6812386880f30bc64c2921299cc4d7b47f"}, {"url": "https://git.kernel.org/stable/c/89fe118b6470119b20c04afc36e45b81a69ea11f"}, {"url": "https://git.kernel.org/stable/c/153d5520c3f9fd62e71c7e7f9e34b59cf411e555"}, {"url": "https://git.kernel.org/stable/c/cded4002d22177e8deaca1f257ecd932c9582b6b"}, {"url": "https://git.kernel.org/stable/c/e02494114ebf7c8b42777c6cd6982f113bfdbec7"}], "title": "crypto: authencesn - 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This requires local syscall access rather than remote packets directly reaching the bad branch.\nAC:L - The attacker controls the AF_ALG request buffers, associated-data length, operation type, key, and authsize, and no race or hard-to-influence state is required. The fault occurs before ICV verification, so a valid packet/tag is not needed.\nPR:L - AF_ALG socket creation, bind, key setup, and AEAD decrypt do not require CAP_NET_ADMIN or CAP_SYS_ADMIN, but the attacker needs local unprivileged code execution. XFRM state management is privileged, but the lower-privilege AF_ALG path reaches the bug.\nUI:N - No victim action is required once the local attacker runs the AF_ALG syscall sequence. The attacker supplies both input and output buffers directly.\nS:U - The vulnerability is in kernel crypto processing and impacts the same kernel security authority. It does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The bug is a kernel memory-corruption condition from writing ESN high sequence bytes past the intended out-of-place destination; successful exploitation of such corruption could expose arbitrary kernel memory. Under the required uncertainty rule, this is scored as high confidentiality impact.\nI:H - The vulnerable code performs an attacker-influenced out-of-bounds write of four bytes before authentication succeeds. Kernel out-of-bounds writes are scored as high integrity impact because they can plausibly be shaped into control-flow or data corruption.\nA:H - At minimum, the AF_ALG path can drive scatterwalk past the end of the destination scatterlist and crash the kernel. A local attacker can repeat the trigger without authentication, causing high availability impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "8c62f618576519dbed6816fafc623ce592953025", "versionType": "git"}, {"status": "affected", "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "d589abd8b019b07075fda255ceab8c8e950cdb3f", "versionType": "git"}, {"status": "affected", "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "5466e7d0cd9e4f9cef9d8f18f18b60e7bc1c77e5", "versionType": "git"}, {"status": "affected", "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "d0c4ff6812386880f30bc64c2921299cc4d7b47f", "versionType": "git"}, {"status": "affected", "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "89fe118b6470119b20c04afc36e45b81a69ea11f", "versionType": "git"}, {"status": "affected", "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "153d5520c3f9fd62e71c7e7f9e34b59cf411e555", "versionType": "git"}, {"status": "affected", "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "cded4002d22177e8deaca1f257ecd932c9582b6b", "versionType": "git"}, {"status": "affected", "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234", "lessThan": "e02494114ebf7c8b42777c6cd6982f113bfdbec7", "versionType": "git"}], "programFiles": ["crypto/authencesn.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.3"}, {"status": "unaffected", "version": "0", "lessThan": "4.3", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.254", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.204", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.170", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.137", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.85", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.22", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.12", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["crypto/authencesn.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/8c62f618576519dbed6816fafc623ce592953025"}, {"url": "https://git.kernel.org/stable/c/d589abd8b019b07075fda255ceab8c8e950cdb3f"}, {"url": "https://git.kernel.org/stable/c/5466e7d0cd9e4f9cef9d8f18f18b60e7bc1c77e5"}, {"url": "https://git.kernel.org/stable/c/d0c4ff6812386880f30bc64c2921299cc4d7b47f"}, {"url": "https://git.kernel.org/stable/c/89fe118b6470119b20c04afc36e45b81a69ea11f"}, {"url": "https://git.kernel.org/stable/c/153d5520c3f9fd62e71c7e7f9e34b59cf411e555"}, {"url": "https://git.kernel.org/stable/c/cded4002d22177e8deaca1f257ecd932c9582b6b"}, {"url": "https://git.kernel.org/stable/c/e02494114ebf7c8b42777c6cd6982f113bfdbec7"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: authencesn - 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"matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption\n\nWhen decrypting data that is not in-place (src != dst), there is\nno need to save the high-order sequence bits in dst as it could\nsimply be re-copied from the source.\n\nHowever, the data to be hashed need to be rearranged accordingly.\n\n\nThanks,"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: authencesn - No colocar hiseq al final de dst para descifrado fuera de lugar\n\nAl descifrar datos que no est\u00e1n en su lugar (src != dst), no hay\nnecesidad de guardar los bits de secuencia de orden superior en dst, ya que\nsimplemente podr\u00eda ser recopiado de la fuente.\n\nSin embargo, los datos a ser hasheados necesitan ser reorganizados en consecuencia.\n\nGracias,"}], "id": "CVE-2026-43033", "lastModified": "2026-11-11T23:10:00.263", "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, 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{"bugzilla": {"description": "kernel: crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption", "id": "2464405", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464405"}, "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-237", "details": ["A flaw was found in the Linux kernel's `authencesn` cryptographic module. When performing out-of-place decryption (where source and destination data buffers are different), the system incorrectly handles high-order sequence bits. This leads to improper data rearrangement before hashing, which could potentially affect the integrity of cryptographic operations."], "name": "CVE-2026-43033", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43033\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43033\nhttps://lore.kernel.org/linux-cve-announce/2026050101-CVE-2026-43033-25c2@gregkh/T"], "threat_severity": "Moderate"}

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