{"api_version":"1","generated_at":"2026-05-11T11:02:46+00:00","cve":"CVE-2026-43379","urls":{"html":"https://cve.report/CVE-2026-43379","api":"https://cve.report/api/cve/CVE-2026-43379.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43379","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43379"},"summary":{"title":"ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()\n\nopinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being\naccessed after rcu_read_unlock() has been called. This creates a\nrace condition where the memory could be freed by a concurrent\nwriter between the unlock and the subsequent pointer dereferences\n(opinfo->is_lease, etc.), leading to a use-after-free.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-08 15:16:49","updated_at":"2026-05-11 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the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()\n\nopinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being\naccessed after rcu_read_unlock() has been called. This creates a\nrace condition where the memory could be freed by a concurrent\nwriter between the unlock and the subsequent pointer dereferences\n(opinfo->is_lease, etc.), leading to a use-after-free."}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-05-11T06:33:59.239Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086"},{"url":"https://git.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6"},{"url":"https://git.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399"},{"url":"https://git.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619"},{"url":"https://git.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25"}],"title":"ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43379","datePublished":"2026-05-08T14:21:28.027Z","dateReserved":"2026-05-01T14:12:56.006Z","dateUpdated":"2026-05-11T06:33:59.239Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-08 15:16:49","lastModifiedDate":"2026-05-11 08:16:12","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43379","Ordinal":"1","Title":"ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()","CVE":"CVE-2026-43379","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43379","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()\n\nopinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being\naccessed after rcu_read_unlock() has been called. This creates a\nrace condition where the memory could be freed by a concurrent\nwriter between the unlock and the subsequent pointer dereferences\n(opinfo->is_lease, etc.), leading to a use-after-free.","Type":"Description","Title":"ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()"}]}}}