{"api_version":"1","generated_at":"2026-07-23T13:28:50+00:00","cve":"CVE-2026-46182","urls":{"html":"https://cve.report/CVE-2026-46182","api":"https://cve.report/api/cve/CVE-2026-46182.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46182","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46182"},"summary":{"title":"pseries/papr-hvpipe: Prevent kernel stack memory leak to userspace","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npseries/papr-hvpipe: Prevent kernel stack memory leak to userspace\n\nThe hdr variable is allocated on the stack and only hdr.version and\nhdr.flags are initialized explicitly. Because the struct papr_hvpipe_hdr\ncontains reserved padding bytes (reserved[3] and reserved2[40]), these\ncould leak the uninitialized bytes to userspace after copy_to_user().\n\nThis patch fixes that by initializing the whole struct to 0.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-28 10:16:33","updated_at":"2026-06-11 03:00:58"},"problem_types":["CWE-401"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/0479b6e9f999cc1cbad7d9f09f574fc387e605d5","name":"https://git.kernel.org/stable/c/0479b6e9f999cc1cbad7d9f09f574fc387e605d5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cefeed44296261173a806bef988b26bc565da4be","name":"https://git.kernel.org/stable/c/cefeed44296261173a806bef988b26bc565da4be","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f88f8e4485b437e0a2f96a7ff1f88aa22d925659","name":"https://git.kernel.org/stable/c/f88f8e4485b437e0a2f96a7ff1f88aa22d925659","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46182","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46182","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86 0479b6e9f999cc1cbad7d9f09f574fc387e605d5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86 f88f8e4485b437e0a2f96a7ff1f88aa22d925659 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86 cefeed44296261173a806bef988b26bc565da4be git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.30 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.7 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2026","cve_id":"46182","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"46182","cve":"CVE-2026-46182","epss":"0.000170000","percentile":"0.042380000","score_date":"2026-06-02","updated_at":"2026-06-03 00:08:17"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/powerpc/platforms/pseries/papr-hvpipe.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0479b6e9f999cc1cbad7d9f09f574fc387e605d5","status":"affected","version":"cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86","versionType":"git"},{"lessThan":"f88f8e4485b437e0a2f96a7ff1f88aa22d925659","status":"affected","version":"cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86","versionType":"git"},{"lessThan":"cefeed44296261173a806bef988b26bc565da4be","status":"affected","version":"cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/powerpc/platforms/pseries/papr-hvpipe.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.18"},{"lessThan":"6.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.30","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.30","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.7","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc3","versionStartIncluding":"6.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\npseries/papr-hvpipe: Prevent kernel stack memory leak to userspace\n\nThe hdr variable is allocated on the stack and only hdr.version and\nhdr.flags are initialized explicitly. Because the struct papr_hvpipe_hdr\ncontains reserved padding bytes (reserved[3] and reserved2[40]), these\ncould leak the uninitialized bytes to userspace after copy_to_user().\n\nThis patch fixes that by initializing the whole struct to 0."}],"providerMetadata":{"dateUpdated":"2026-05-28T09:36:35.528Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0479b6e9f999cc1cbad7d9f09f574fc387e605d5"},{"url":"https://git.kernel.org/stable/c/f88f8e4485b437e0a2f96a7ff1f88aa22d925659"},{"url":"https://git.kernel.org/stable/c/cefeed44296261173a806bef988b26bc565da4be"}],"title":"pseries/papr-hvpipe: Prevent kernel stack memory leak to userspace","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46182","datePublished":"2026-05-28T09:36:35.528Z","dateReserved":"2026-05-13T15:03:33.103Z","dateUpdated":"2026-05-28T09:36:35.528Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-28 10:16:33","lastModifiedDate":"2026-06-11 03:00:58","problem_types":["CWE-401"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.30","matchCriteriaId":"9EB9FADE-E22F-41C2-9790-4F5564D59E62"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.0.7","matchCriteriaId":"D0893CA7-9AE6-4DFE-AC75-48967D73AD8E"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*","matchCriteriaId":"B1EF7059-E670-45F4-B422-54C40FA86390"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*","matchCriteriaId":"0D38F0BF-A728-4133-A358-D44A2F7EE6D6"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46182","Ordinal":"1","Title":"pseries/papr-hvpipe: Prevent kernel stack memory leak to userspa","CVE":"CVE-2026-46182","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46182","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\npseries/papr-hvpipe: Prevent kernel stack memory leak to userspace\n\nThe hdr variable is allocated on the stack and only hdr.version and\nhdr.flags are initialized explicitly. Because the struct papr_hvpipe_hdr\ncontains reserved padding bytes (reserved[3] and reserved2[40]), these\ncould leak the uninitialized bytes to userspace after copy_to_user().\n\nThis patch fixes that by initializing the whole struct to 0.","Type":"Description","Title":"pseries/papr-hvpipe: Prevent kernel stack memory leak to userspa"}]}}}