338 lines
16 KiB
JSON
338 lines
16 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-2026-43493",
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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": "2026-05-01T14:12:56.013Z",
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"datePublished": "2026-05-19T10:44:25.402Z",
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"dateUpdated": "2026-10-19T19:26:37.700Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:28:16.602Z"
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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\ncrypto: pcrypt - Fix handling of MAY_BACKLOG requests\n\nMAY_BACKLOG requests can return EBUSY. Handle them by checking\nfor that value and filtering out EINPROGRESS notifications."
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}
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],
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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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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:N - pcrypt AEAD can sit under network-facing kernel crypto consumers such as kTLS/TIPC that process peer-supplied records or packets. In the highest reasonable deployment, a remote peer can drive the vulnerable encrypt/decrypt path through network traffic.\nAC:L - The trigger is child crypto backlog behavior under `CRYPTO_TFM_REQ_MAY_BACKLOG`; an attacker can induce queue pressure with concurrent requests or traffic. There is no race that depends on conditions outside the attacker's control.\nPR:N - The network-facing path requires no kernel privileges from the remote peer. The local AF_ALG AEAD path also has no capability gate, but the higher-severity network scenario is defensible.\nUI:N - No victim interaction is required once the affected crypto consumer is configured. The attacker only sends data or submits crypto requests.\nS:U - The bug corrupts kernel crypto/request state within the same kernel security authority. It is not a VM escape, IOMMU bypass, or other scope-changing boundary crossing.\nC:H - Mishandling `-EBUSY` can complete and free the request while the child request remains queued, leading to use-after-free on later callbacks. A kernel UAF is reasonably exploitable for high-impact information disclosure.\nI:H - The stale callback reuses freed request/padata memory and can drive list operations and completion paths on attacker-reclaimed objects. This is memory corruption with a plausible path to arbitrary write or control-flow corruption.\nA:H - At minimum, the premature completion and later queued callback can dereference or manipulate freed kernel memory. That can produce kernel oops/panic or list corruption, giving high availability impact."
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}
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]
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}
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],
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"crypto/pcrypt.c"
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"crypto/pcrypt.c"
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],
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{
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"status": "affected"
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{
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"version": "0",
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"lessThan": "2.6.34",
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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": "5.10.258",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.209",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.175",
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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": "6.6.140",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.86",
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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": "6.18.27",
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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": "7.0.4",
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"lessThanOrEqual": "7.0.*",
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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",
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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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"operator": "OR",
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"url": "https://git.kernel.org/stable/c/915b692e6cb723aac658c25eb82c58fd81235110"
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}
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],
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"title": "crypto: pcrypt - Fix handling of MAY_BACKLOG requests",
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"providerMetadata": {
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"dateUpdated": "2026-10-15T01:19:26.688Z"
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"affected": [
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"versions": [
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{
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{
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"metrics": [
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-43493",
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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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"Automatable": "yes"
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"Technical Impact": "total"
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:17:44.453814Z"
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"descriptions": [
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"lang": "en",
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"description": "CWE-390 Detection of Error Condition Without Action"
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