256 lines
13 KiB
JSON
256 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-80709",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.787Z",
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"datePublished": "2026-08-28T06:53:09.439Z",
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"dateUpdated": "2026-10-16T19:26:34.515Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-29T06:22:25.717Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/s390/crypto/zcrypt_api.c"
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],
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"versions": [
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{
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"version": "cfd68b33094e1a92249850ff3c3c92ae9112a541",
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"lessThan": "4589f742718d0256ea6dd1f5a78be6e689bdb8aa",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cfd68b33094e1a92249850ff3c3c92ae9112a541",
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"lessThan": "b505dcc8307d64468b463dfad45a03bf865c637e",
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"status": "affected",
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},
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"status": "affected",
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{
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"lessThan": "672b12940e3f1336dfed5287412a71500adf2a76",
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"status": "affected",
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"versionType": "git"
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},
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{
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"lessThan": "1223477ca88e2396eca440919d0ca8754df79bd5",
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"status": "affected",
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"lessThan": "983279d7f86ade73db86f886e09172dd567031b5",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/s390/crypto/zcrypt_api.c"
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],
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"versions": [
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{
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"version": "5.18",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.18",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.183",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.151",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.103",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.44",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.8",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.18",
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"versionEndExcluding": "6.1.183"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/4589f742718d0256ea6dd1f5a78be6e689bdb8aa"
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},
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{
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"url": "https://git.kernel.org/stable/c/b505dcc8307d64468b463dfad45a03bf865c637e"
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},
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{
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"url": "https://git.kernel.org/stable/c/13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15"
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{
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"url": "https://git.kernel.org/stable/c/672b12940e3f1336dfed5287412a71500adf2a76"
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{
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"url": "https://git.kernel.org/stable/c/1223477ca88e2396eca440919d0ca8754df79bd5"
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},
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{
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"url": "https://git.kernel.org/stable/c/983279d7f86ade73db86f886e09172dd567031b5"
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}
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],
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"title": "s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-80709",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:20:33.288089Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:26:34.515Z"
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}
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}
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]
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}
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} |