{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89897",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89897"
  ],
  "published": "2026-09-16T10:32:03Z",
  "summary": "media: cec: Serialize exclusive follower delivery",
  "details": "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89897"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/efc829b4b937f98c4467bffe9243f756b7cfbf7f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cac577854826950dda4d53569728b1da6c1425d5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4b532b271c91790b7ab661cd488a7ad36f5c4f6b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/271e57a936dcdbaecb4b1bd005d9a285bbe60ab4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/df941e6851da17fc53c7f6af2bdcc7383d17babc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5c62095acc2a952099688774513c4a637bcdb2b5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ae614f48712156fb0f55b207338d48d422c58bc0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1924d0788caa6c66fd320dd4704fae99487fd2c7"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-16T14:40:32Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - cec_receive_notify() runs from cec_received_msg_ts() on HDMI-CEC frames a peer places on the shared CEC line. HDMI-CEC is a multi-drop bus among TVs, AVRs, streaming sticks, and conference or automotive HDMI sources, matching CAN/Bluetooth adjacent-segment scoring rather than Internet-routable Network.\nAC:H - The use-after-free requires cec_release() to kfree the exclusive-follower cec_fh after the unlocked pointer load in cec_receive_notify(). A CEC peer can flood receive but cannot close that filehandle, so success depends on concurrent local teardown the attacker cannot initiate.\nPR:N - HDMI-CEC has no authentication. 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."
    }
  }
}