CVE-2026-43336

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This is a reasonable deployment scenario for the affected library crypto code.\nAC:L - Triggering the affected function is deterministic once a configured network crypto endpoint processes a packet; there is no race or fragile heap/layout condition in the bug mechanism. When uncertain, the lower-complexity option is selected.\nPR:N - A remote sender does not need a local account or kernel privilege to send packets to a configured ESP/WireGuard endpoint and cause pre-authentication or authentication-check crypto processing. Local configuration of the endpoint is an environmental precondition, not attacker privilege.\nUI:N - No victim user action is required once the affected kernel subsystem is configured and reachable. The attacker can trigger processing by sending packets or requests directly.\nS:U - The vulnerable component and impacted secrets are within the kernel\u2019s own security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The stale `permuted_state` is invertible back to the original ChaCha state and therefore key-equivalent, including for kernel crypto and RNG users. Exposure of that stack data can compromise full cryptographic keys or RNG state, so confidentiality impact is high.\nI:N - The bug is failure to clear sensitive stack data and does not provide a write primitive or data modification path. No integrity impact is directly caused.\nA:N - The issue does not corrupt memory, dereference invalid pointers, deadlock, or otherwise crash the kernel. No availability impact is directly caused."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["lib/crypto/chacha-block-generic.c"], "versions": [{"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3", "lessThan": "e90ee961af515a484f091678ce58a4c3f7b73b02", "status": "affected", "versionType": "git"}, {"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3", "lessThan": "b416a4245f04a450c67a13e6d96056c37c5b33fe", "status": "affected", "versionType": "git"}, {"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3", "lessThan": "bd62d9b44464a6c20a34a74068e7a784d0afa04a", "status": "affected", "versionType": "git"}, {"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3", "lessThan": "066c760acead1fb743bae294dbd89f479ae43b9b", "status": "affected", "versionType": "git"}, {"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3", "lessThan": "1d761e5a7340c46479fb2399598f331e4fe2c633", "status": "affected", "versionType": "git"}, {"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3", "lessThan": "1933249263c3a98df79992f61a566476e4163bcc", "status": "affected", "versionType": "git"}, {"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3", "lessThan": "91999af43ca2125e3b2c18fcfc02912ada02efc3", "status": "affected", "versionType": "git"}, {"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3", "lessThan": "e5046823f8fa3677341b541a25af2fcb99a5b1e0", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["lib/crypto/chacha-block-generic.c"], "versions": [{"version": "4.2", "status": "affected"}, {"version": "0", "lessThan": "4.2", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.169", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.135", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.82", "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": "4.2", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.1.169"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.6.135"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.12.82"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e90ee961af515a484f091678ce58a4c3f7b73b02"}, {"url": "https://git.kernel.org/stable/c/b416a4245f04a450c67a13e6d96056c37c5b33fe"}, {"url": "https://git.kernel.org/stable/c/bd62d9b44464a6c20a34a74068e7a784d0afa04a"}, {"url": "https://git.kernel.org/stable/c/066c760acead1fb743bae294dbd89f479ae43b9b"}, {"url": "https://git.kernel.org/stable/c/1d761e5a7340c46479fb2399598f331e4fe2c633"}, {"url": "https://git.kernel.org/stable/c/1933249263c3a98df79992f61a566476e4163bcc"}, {"url": "https://git.kernel.org/stable/c/91999af43ca2125e3b2c18fcfc02912ada02efc3"}, {"url": "https://git.kernel.org/stable/c/e5046823f8fa3677341b541a25af2fcb99a5b1e0"}], "title": "lib/crypto: chacha: Zeroize permuted_state before it leaves scope", "x_generator": {"engine": "bippy-1.2.0"}}}}

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siguiente vulnerabilidad ha sido resuelta:\n\nlib/crypto: chacha: Poner a cero permuted_state antes de que salga de su \u00e1mbito\n\nDado que la permutaci\u00f3n ChaCha es invertible, la variable local \u2019permuted_state\u2019 es suficiente para calcular el \u2019state\u2019 original, y por lo tanto la clave, incluso despu\u00e9s de que se haya realizado la permutaci\u00f3n.\n\nAunque el kernel es bastante inconsistente en cuanto a poner a cero secretos en la pila (y algunas bibliotecas criptogr\u00e1ficas prominentes del espacio de usuario no se molestan en absoluto ya que de todos modos no se garantiza que funcione), el kernel s\u00ed intenta hacerlo como una buena pr\u00e1ctica, especialmente en casos que involucran al RNG.\n\nPor lo tanto, poner a cero expl\u00edcitamente \u2019permuted_state\u2019 antes de que quede fuera de su \u00e1mbito."}], "id": "CVE-2026-43336", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-08T14:16:43.383", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/066c760acead1fb743bae294dbd89f479ae43b9b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1933249263c3a98df79992f61a566476e4163bcc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1d761e5a7340c46479fb2399598f331e4fe2c633"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/91999af43ca2125e3b2c18fcfc02912ada02efc3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b416a4245f04a450c67a13e6d96056c37c5b33fe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bd62d9b44464a6c20a34a74068e7a784d0afa04a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e5046823f8fa3677341b541a25af2fcb99a5b1e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e90ee961af515a484f091678ce58a4c3f7b73b02"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: lib/crypto: chacha: Zeroize permuted_state before it leaves scope", "id": "2468057", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468057"}, "csaw": false, "cwe": "CWE-212", "details": ["A flaw was found in the Linux kernel's ChaCha cryptographic algorithm implementation. The `permuted_state` local variable, which is sufficient to compute the original cryptographic key, was not properly zeroized before leaving its scope. This oversight could allow an attacker to recover the cryptographic key, leading to information disclosure."], "name": "CVE-2026-43336", "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": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43336\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43336\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-43336.mbox"]}

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