{"api_version":"1","generated_at":"2026-09-17T07:00:57+00:00","cve":"CVE-2026-89897","urls":{"html":"https://cve.report/CVE-2026-89897","api":"https://cve.report/api/cve/CVE-2026-89897.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89897","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89897"},"summary":{"title":"media: cec: Serialize exclusive follower delivery","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cec: Serialize exclusive follower delivery\n\ncec_receive_notify() reads the exclusive follower pointer without the\nadapter lock. 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the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cec: Serialize exclusive follower delivery\n\ncec_receive_notify() reads the exclusive follower pointer without the\nadapter lock. 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Any device on the same CEC bus can emit frames that the adapter delivers into cec_received_msg_ts() with no Linux account, capability, or user-namespace check on the host.\nUI:N - Once the adapter is configured and receiving, which is normal for TVs, Android HDMI-CEC, SBCs, and automotive head units that claim a logical address at boot, RX delivery and any concurrent follower close run without a mount, prompt, or other interactive victim step.\nS:U - The use-after-free is of the kmalloc'd struct cec_fh inside the host kernel CEC core and does not cross a VM, IOMMU, or other separate security-authority boundary.\nC:H - After cec_release() kfree()s the exclusive follower, cec_queue_msg_fh() still locks and walks lists on the dangling cec_fh. That kernel heap use-after-free enables disclosure of reused object contents.\nI:H - cec_queue_msg_fh() writes the freed filehandle via mutex operations, list_add_tail of a new cec_msg_entry, and wake_up_interruptible, a heap use-after-free write and control-flow hijack primitive.\nA:H - Using a freed cec_fh from the receive path causes a kernel oops or panic even when not fully exploited for code execution, taking down the host."}]}],"providerMetadata":{"dateUpdated":"2026-09-16T14:39:46.418Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/efc829b4b937f98c4467bffe9243f756b7cfbf7f"},{"url":"https://git.kernel.org/stable/c/cac577854826950dda4d53569728b1da6c1425d5"},{"url":"https://git.kernel.org/stable/c/4b532b271c91790b7ab661cd488a7ad36f5c4f6b"},{"url":"https://git.kernel.org/stable/c/271e57a936dcdbaecb4b1bd005d9a285bbe60ab4"},{"url":"https://git.kernel.org/stable/c/df941e6851da17fc53c7f6af2bdcc7383d17babc"},{"url":"https://git.kernel.org/stable/c/5c62095acc2a952099688774513c4a637bcdb2b5"},{"url":"https://git.kernel.org/stable/c/ae614f48712156fb0f55b207338d48d422c58bc0"},{"url":"https://git.kernel.org/stable/c/1924d0788caa6c66fd320dd4704fae99487fd2c7"}],"title":"media: cec: Serialize exclusive follower delivery","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89897","datePublished":"2026-09-16T10:31:58.184Z","dateReserved":"2026-09-11T19:38:34.773Z","dateUpdated":"2026-09-16T14:39:46.418Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 11:16:58","lastModifiedDate":"2026-09-16 15:18:15","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.6,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89897","Ordinal":"1","Title":"media: cec: Serialize exclusive follower delivery","CVE":"CVE-2026-89897","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89897","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cec: Serialize exclusive follower delivery\n\ncec_receive_notify() reads the exclusive follower pointer without the\nadapter lock. Serialize the no-follower check and message delivery\nagainst mode changes and release.","Type":"Description","Title":"media: cec: Serialize exclusive follower delivery"}]}}}