{"api_version":"1","generated_at":"2026-05-27T22:56:55+00:00","cve":"CVE-2026-46033","urls":{"html":"https://cve.report/CVE-2026-46033","api":"https://cve.report/api/cve/CVE-2026-46033.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46033","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46033"},"summary":{"title":"crypto: authencesn - reject short ahash digests during instance creation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: authencesn - reject short ahash digests during instance creation\n\nauthencesn requires either a zero authsize or an authsize of at least\n4 bytes because the ESN encrypt/decrypt paths always move 4 bytes of\nhigh-order sequence number data at the end of the authenticated data.\n\nWhile crypto_authenc_esn_setauthsize() already rejects explicit\nnon-zero authsizes in the range 1..3, crypto_authenc_esn_create()\nstill copied auth->digestsize into inst->alg.maxauthsize without\nvalidating it.  The AEAD core then initialized the tfm's default\nauthsize from that value.\n\nAs a result, selecting an ahash with digest size 1..3, such as\ncbcmac(cipher_null), exposed authencesn instances whose default\nauthsize was invalid even though setauthsize() would have rejected the\nsame value.  AF_ALG could then trigger the ESN tail handling with a\ntoo-short tag and hit an out-of-bounds access.\n\nReject authencesn instances whose ahash digest size is in the invalid\nnon-zero range 1..3 so that no tfm can inherit an unsupported default\nauthsize.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:22","updated_at":"2026-05-27 14:48:03"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/5db6ef9847717329f12c5ea8aba7e9f588a980c0","name":"https://git.kernel.org/stable/c/5db6ef9847717329f12c5ea8aba7e9f588a980c0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9aff81e8217e9de2929084b03b3c7f81988c112b","name":"https://git.kernel.org/stable/c/9aff81e8217e9de2929084b03b3c7f81988c112b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b69933e97efea238ebbfcf70c2b1be1cd03f13e3","name":"https://git.kernel.org/stable/c/b69933e97efea238ebbfcf70c2b1be1cd03f13e3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b42821c15445f93daea3e76ada682b2b7181c476","name":"https://git.kernel.org/stable/c/b42821c15445f93daea3e76ada682b2b7181c476","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/67f1f0933cc3d78dde222842bcad2778ec7a0b88","name":"https://git.kernel.org/stable/c/67f1f0933cc3d78dde222842bcad2778ec7a0b88","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46033","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46033","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd b69933e97efea238ebbfcf70c2b1be1cd03f13e3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd 67f1f0933cc3d78dde222842bcad2778ec7a0b88 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd b42821c15445f93daea3e76ada682b2b7181c476 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd 9aff81e8217e9de2929084b03b3c7f81988c112b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd 5db6ef9847717329f12c5ea8aba7e9f588a980c0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.11","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.140 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.86 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.27 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.4 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["crypto/authencesn.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b69933e97efea238ebbfcf70c2b1be1cd03f13e3","status":"affected","version":"f15f05b0a5de667c821a9727c33bce9d1d9b26dd","versionType":"git"},{"lessThan":"67f1f0933cc3d78dde222842bcad2778ec7a0b88","status":"affected","version":"f15f05b0a5de667c821a9727c33bce9d1d9b26dd","versionType":"git"},{"lessThan":"b42821c15445f93daea3e76ada682b2b7181c476","status":"affected","version":"f15f05b0a5de667c821a9727c33bce9d1d9b26dd","versionType":"git"},{"lessThan":"9aff81e8217e9de2929084b03b3c7f81988c112b","status":"affected","version":"f15f05b0a5de667c821a9727c33bce9d1d9b26dd","versionType":"git"},{"lessThan":"5db6ef9847717329f12c5ea8aba7e9f588a980c0","status":"affected","version":"f15f05b0a5de667c821a9727c33bce9d1d9b26dd","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["crypto/authencesn.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.11"},{"lessThan":"4.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.140","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.86","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.27","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.140","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.86","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.27","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.4","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc2","versionStartIncluding":"4.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: authencesn - reject short ahash digests during instance creation\n\nauthencesn requires either a zero authsize or an authsize of at least\n4 bytes because the ESN encrypt/decrypt paths always move 4 bytes of\nhigh-order sequence number data at the end of the authenticated data.\n\nWhile crypto_authenc_esn_setauthsize() already rejects explicit\nnon-zero authsizes in the range 1..3, crypto_authenc_esn_create()\nstill copied auth->digestsize into inst->alg.maxauthsize without\nvalidating it.  The AEAD core then initialized the tfm's default\nauthsize from that value.\n\nAs a result, selecting an ahash with digest size 1..3, such as\ncbcmac(cipher_null), exposed authencesn instances whose default\nauthsize was invalid even though setauthsize() would have rejected the\nsame value.  AF_ALG could then trigger the ESN tail handling with a\ntoo-short tag and hit an out-of-bounds access.\n\nReject authencesn instances whose ahash digest size is in the invalid\nnon-zero range 1..3 so that no tfm can inherit an unsupported default\nauthsize."}],"providerMetadata":{"dateUpdated":"2026-05-27T12:56:42.038Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b69933e97efea238ebbfcf70c2b1be1cd03f13e3"},{"url":"https://git.kernel.org/stable/c/67f1f0933cc3d78dde222842bcad2778ec7a0b88"},{"url":"https://git.kernel.org/stable/c/b42821c15445f93daea3e76ada682b2b7181c476"},{"url":"https://git.kernel.org/stable/c/9aff81e8217e9de2929084b03b3c7f81988c112b"},{"url":"https://git.kernel.org/stable/c/5db6ef9847717329f12c5ea8aba7e9f588a980c0"}],"title":"crypto: authencesn - reject short ahash digests during instance creation","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46033","datePublished":"2026-05-27T12:56:42.038Z","dateReserved":"2026-05-13T15:03:33.093Z","dateUpdated":"2026-05-27T12:56:42.038Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 14:17:22","lastModifiedDate":"2026-05-27 14:48:03","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46033","Ordinal":"1","Title":"crypto: authencesn - reject short ahash digests during instance ","CVE":"CVE-2026-46033","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46033","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: authencesn - reject short ahash digests during instance creation\n\nauthencesn requires either a zero authsize or an authsize of at least\n4 bytes because the ESN encrypt/decrypt paths always move 4 bytes of\nhigh-order sequence number data at the end of the authenticated data.\n\nWhile crypto_authenc_esn_setauthsize() already rejects explicit\nnon-zero authsizes in the range 1..3, crypto_authenc_esn_create()\nstill copied auth->digestsize into inst->alg.maxauthsize without\nvalidating it.  The AEAD core then initialized the tfm's default\nauthsize from that value.\n\nAs a result, selecting an ahash with digest size 1..3, such as\ncbcmac(cipher_null), exposed authencesn instances whose default\nauthsize was invalid even though setauthsize() would have rejected the\nsame value.  AF_ALG could then trigger the ESN tail handling with a\ntoo-short tag and hit an out-of-bounds access.\n\nReject authencesn instances whose ahash digest size is in the invalid\nnon-zero range 1..3 so that no tfm can inherit an unsupported default\nauthsize.","Type":"Description","Title":"crypto: authencesn - reject short ahash digests during instance "}]}}}