CVE-2026-80709

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routinely delegate such restricted crypto device access to non-root service accounts, not init-namespace root alone.\nUI:N - The attacker triggers the flaw by issuing ZSENDEP11CPRB with a crafted administrative EP11 CPRB from their own process; no separate victim action such as mounting a filesystem or opening a file is required.\nS:U - Impact is kernel heap out-of-bounds read and bypass of per-device admin-domain filtering within the host kernel address space; it does not cross a VM, IOMMU, or other changed security-authority boundary.\nC:H - Using domain 256-65534 with an admin CPRB makes test_bit_inv() index beyond the 256-bit perms->adm bitmap, reading adjacent kmalloc heap memory behind the zcdn_device allocation.\nI:H - If the out-of-bounds read observes a set bit, the admask admin-domain check passes and unauthorized EP11 administrative CPRBs can reach crypto control domains outside the device's intended permissions.\nA:H - Large crafted domain values make test_bit_inv() read 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/s390/crypto/zcrypt_api.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4589f742718d0256ea6dd1f5a78be6e689bdb8aa", "status": "affected", "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "versionType": "git"}, {"lessThan": "b505dcc8307d64468b463dfad45a03bf865c637e", "status": "affected", "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "versionType": "git"}, {"lessThan": "13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15", "status": "affected", "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "versionType": "git"}, {"lessThan": "672b12940e3f1336dfed5287412a71500adf2a76", "status": "affected", "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "versionType": "git"}, {"lessThan": "1223477ca88e2396eca440919d0ca8754df79bd5", "status": "affected", "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "versionType": "git"}, {"lessThan": "983279d7f86ade73db86f886e09172dd567031b5", "status": "affected", "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/s390/crypto/zcrypt_api.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.18"}, {"lessThan": "5.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.151", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.103", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Fix wrong domain value verification with EP11 CPRBs\n\nThere is a wrong upper limit check for the domain value when an EP11\nCPRB is processed for sending to a crypto card. This check is only\nactive on custom device nodes but may lead to access heap memory\nbehind perms->adm when an administrative CPRB is sent.\nAdd correct limit (AP_DOMAINS = 256) checking to fix this."}], "id": "CVE-2026-80709", "lastModified": "2026-10-16T20:18:07.747", "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, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-80709", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:20:33.288089Z", "version": "2.0.3"}}]}, "published": "2026-08-28T08:16:56.523", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1223477ca88e2396eca440919d0ca8754df79bd5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4589f742718d0256ea6dd1f5a78be6e689bdb8aa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/672b12940e3f1336dfed5287412a71500adf2a76"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/983279d7f86ade73db86f886e09172dd567031b5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b505dcc8307d64468b463dfad45a03bf865c637e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs", "id": "2525466", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525466"}, "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-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ns390/zcrypt: Fix wrong domain value verification with EP11 CPRBs\nThere is a wrong upper limit check for the domain value when an EP11\nCPRB is processed for sending to a crypto card. This check is only\nactive on custom device nodes but may lead to access heap memory\nbehind perms->adm when an administrative CPRB is sent.\nAdd correct limit (AP_DOMAINS = 256) checking to fix this.", "A flaw was found in the Linux kernel's s390/zcrypt component. An incorrect upper limit check for the domain value when processing an EP11 Cryptographic Coprocessor Request Block (CPRB) can allow a local user on custom device nodes to access heap memory. This could lead to information disclosure or other memory corruption related issues."], "name": "CVE-2026-80709", "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": "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": "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": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80709\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80709\nhttps://lore.kernel.org/linux-cve-announce/2026082808-CVE-2026-80709-2ca4@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cfd68b33094e1a92249850ff3c3c92ae9112a541,4589f742718d0256ea6dd1f5a78be6e689bdb8aa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cfd68b33094e1a92249850ff3c3c92ae9112a541,b505dcc8307d64468b463dfad45a03bf865c637e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cfd68b33094e1a92249850ff3c3c92ae9112a541,13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cfd68b33094e1a92249850ff3c3c92ae9112a541,672b12940e3f1336dfed5287412a71500adf2a76)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cfd68b33094e1a92249850ff3c3c92ae9112a541,1223477ca88e2396eca440919d0ca8754df79bd5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cfd68b33094e1a92249850ff3c3c92ae9112a541,983279d7f86ade73db86f886e09172dd567031b5)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.183,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.151,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.103,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.44,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.8,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-28T10:30:17.948052+00:00", "updated": "2026-09-02T05:00:13.483967+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}