{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43033", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.977Z", "datePublished": "2026-05-01T14:15:32.583Z", "dateUpdated": "2026-08-05T12:25:26.050Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:25:26.050Z" }, "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," } ], "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 - The vulnerable out-of-place AEAD decrypt path is reachable by a local process through AF_ALG sockets using authencesn, while normal inbound ESP uses in-place src==dst. 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 - Do not place hiseq at end of dst for out-of-place decryption", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:49:07.122Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" }, { "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html" } ] } ] } }