{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43493", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.013Z", "datePublished": "2026-05-19T10:44:25.402Z", "dateUpdated": "2026-10-16T15:20:42.961Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:28:16.602Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "crypto/pcrypt.c" ], "versions": [ { "version": "5a1436beec5744029f3ac90b6fe71a698dcd6155", "lessThan": "ae7e95638d956d556d74b9abb9e780d3bd3dcd9e", "status": "affected", "versionType": "git" }, { "version": "5a1436beec5744029f3ac90b6fe71a698dcd6155", "lessThan": "1d7f07df450bac3301938fbc4251f2611be4084e", "status": "affected", "versionType": "git" }, { "version": "5a1436beec5744029f3ac90b6fe71a698dcd6155", "lessThan": "76641449b28979ebd6c02e9598367e119e385236", "status": "affected", "versionType": "git" }, { "version": "5a1436beec5744029f3ac90b6fe71a698dcd6155", "lessThan": "9f1cbca178c03188e201ed175251372149bb25f2", "status": "affected", "versionType": "git" }, { "version": "5a1436beec5744029f3ac90b6fe71a698dcd6155", "lessThan": "eb34e243df57e32f4c08fa191f3602ea19076276", "status": "affected", "versionType": "git" }, { "version": "5a1436beec5744029f3ac90b6fe71a698dcd6155", "lessThan": "77d55bc8675ee851ed639dc9be77325a8024cf67", "status": "affected", "versionType": "git" }, { "version": "5a1436beec5744029f3ac90b6fe71a698dcd6155", "lessThan": "46271895ddfb1ba41f89f7e0dffbe9c2bcf7380a", "status": "affected", "versionType": "git" }, { "version": "5a1436beec5744029f3ac90b6fe71a698dcd6155", "lessThan": "915b692e6cb723aac658c25eb82c58fd81235110", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "crypto/pcrypt.c" ], "versions": [ { "version": "2.6.34", "status": "affected" }, { "version": "0", "lessThan": "2.6.34", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.86", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "2.6.34", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.12.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.18.27" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.0.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ae7e95638d956d556d74b9abb9e780d3bd3dcd9e" }, { "url": "https://git.kernel.org/stable/c/1d7f07df450bac3301938fbc4251f2611be4084e" }, { "url": "https://git.kernel.org/stable/c/76641449b28979ebd6c02e9598367e119e385236" }, { "url": "https://git.kernel.org/stable/c/9f1cbca178c03188e201ed175251372149bb25f2" }, { "url": "https://git.kernel.org/stable/c/eb34e243df57e32f4c08fa191f3602ea19076276" }, { "url": "https://git.kernel.org/stable/c/77d55bc8675ee851ed639dc9be77325a8024cf67" }, { "url": "https://git.kernel.org/stable/c/46271895ddfb1ba41f89f7e0dffbe9c2bcf7380a" }, { "url": "https://git.kernel.org/stable/c/915b692e6cb723aac658c25eb82c58fd81235110" } ], "title": "crypto: pcrypt - Fix handling of MAY_BACKLOG requests", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:19:26.688Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html" } ] }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-43493", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:17:44.453814Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:20:42.961Z" } } ] } }