{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46033", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.093Z", "datePublished": "2026-05-27T12:56:42.038Z", "dateUpdated": "2026-05-27T12:56:42.038Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-27T12:56:42.038Z"}, "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."}], "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": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd", "lessThan": "b69933e97efea238ebbfcf70c2b1be1cd03f13e3", "status": "affected", "versionType": "git"}, {"version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd", "lessThan": "67f1f0933cc3d78dde222842bcad2778ec7a0b88", "status": "affected", "versionType": "git"}, {"version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd", "lessThan": "b42821c15445f93daea3e76ada682b2b7181c476", "status": "affected", "versionType": "git"}, {"version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd", "lessThan": "9aff81e8217e9de2929084b03b3c7f81988c112b", "status": "affected", "versionType": "git"}, {"version": "f15f05b0a5de667c821a9727c33bce9d1d9b26dd", "lessThan": "5db6ef9847717329f12c5ea8aba7e9f588a980c0", "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": "4.11", "status": "affected"}, {"version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.86", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1-rc2", "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": "4.11", "versionEndExcluding": "6.6.140"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.12.86"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.18.27"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.0.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.1-rc2"}]}]}], "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"}}}}

{}

{"cveTags": [], "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."}], "id": "CVE-2026-46033", "lastModified": "2026-05-27T14:48:03.013", "metrics": {}, "published": "2026-05-27T14:17:22.313", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5db6ef9847717329f12c5ea8aba7e9f588a980c0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/67f1f0933cc3d78dde222842bcad2778ec7a0b88"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9aff81e8217e9de2929084b03b3c7f81988c112b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b42821c15445f93daea3e76ada682b2b7181c476"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b69933e97efea238ebbfcf70c2b1be1cd03f13e3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: crypto: authencesn - reject short ahash digests during instance creation", "id": "2482000", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482000"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-1284", "details": ["A flaw was found in the Linux kernel's `authencesn` cryptographic module. This vulnerability arises from insufficient validation of cryptographic digest sizes during the creation of new instances. A local attacker could exploit this by providing a malformed input, leading to an out-of-bounds memory access. This could cause system instability, a denial of service (DoS), or potentially enable unauthorized access to sensitive information or system control."], "name": "CVE-2026-46033", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46033\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46033\nhttps://lore.kernel.org/linux-cve-announce/2026052749-CVE-2026-46033-dcad@gregkh/T"], "threat_severity": "Important"}