{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80709", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.787Z", "datePublished": "2026-08-28T06:53:09.439Z", "dateUpdated": "2026-10-16T19:26:34.515Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:22:25.717Z" }, "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." } ], "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 - Reached only via ZSENDEP11CPRB ioctl on an s390 zcrypt custom zcdn character device (zcrypt_unlocked_ioctl -> zsendep11cprb_ioctl -> _zcrypt_send_ep11_cprb); no network, radio, or physical-bus entry path exists.\nAC:L - A local attacker with a permitted zcdn fd fully controls ep11_urb/CPRB target_id and the admin flag; domain values 256-65534 reliably trigger the flawed test_bit_inv() past perms->adm without races or conditions outside attacker control.\nPR:L - Exploitation requires local access to a custom zcdn node with ZSENDEP11CPRB enabled in ioctlmask; IBM Z/LinuxONE deployments 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 far beyond the zcdn_device kmalloc object, which can access unmapped memory and provoke a kernel oops or panic during the ioctl path." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/s390/crypto/zcrypt_api.c" ], "versions": [ { "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "lessThan": "4589f742718d0256ea6dd1f5a78be6e689bdb8aa", "status": "affected", "versionType": "git" }, { "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "lessThan": "b505dcc8307d64468b463dfad45a03bf865c637e", "status": "affected", "versionType": "git" }, { "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "lessThan": "13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15", "status": "affected", "versionType": "git" }, { "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "lessThan": "672b12940e3f1336dfed5287412a71500adf2a76", "status": "affected", "versionType": "git" }, { "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "lessThan": "1223477ca88e2396eca440919d0ca8754df79bd5", "status": "affected", "versionType": "git" }, { "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541", "lessThan": "983279d7f86ade73db86f886e09172dd567031b5", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/s390/crypto/zcrypt_api.c" ], "versions": [ { "version": "5.18", "status": "affected" }, { "version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "5.18", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/4589f742718d0256ea6dd1f5a78be6e689bdb8aa" }, { "url": "https://git.kernel.org/stable/c/b505dcc8307d64468b463dfad45a03bf865c637e" }, { "url": "https://git.kernel.org/stable/c/13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15" }, { "url": "https://git.kernel.org/stable/c/672b12940e3f1336dfed5287412a71500adf2a76" }, { "url": "https://git.kernel.org/stable/c/1223477ca88e2396eca440919d0ca8754df79bd5" }, { "url": "https://git.kernel.org/stable/c/983279d7f86ade73db86f886e09172dd567031b5" } ], "title": "s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-80709", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:20:33.288089Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:34.515Z" } } ] } }