media: vidtv: fix NULL pointer dereference in vidtv_channel_pmt_match_sections

{
  "id": "b6e79751de7e914a6c18662af0940a61b31b7cacda9d1436647b5a2104d440b9",
  "url": "https://osv.dev/vulnerability/CVE-2026-31599",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "media: vidtv: fix NULL pointer dereference in vidtv_channel_pmt_match_sections",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: media: vidtv: fix NULL pointer dereference in vidtv_channel_pmt_match_sections syzbot reported a general protection fault in vidtv_psi_desc_assign [1]. vidtv_psi_pmt_stream_init() can return NULL on memory allocation failure, but vidtv_channel_pmt_match_sections() does not check for this. When tail is NULL, the subsequent call to vidtv_psi_desc_assign(&tail->descriptor, desc) dereferences a NULL pointer offset, causing a general protection fault. Add a NULL check after vidtv_psi_pmt_stream_init(). On failure, clean up the already-allocated stream chain and return. [1] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:vidtv_psi_desc_assign+0x24/0x90 drivers/media/test-drivers/vidtv/vidtv_psi.c:629 Call Trace: vidtv_channel_pmt_match_sections drivers/media/test-drivers/vidtv/vidtv_channel.c:349 [inline] vidtv_channel_si_init+0x1445/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:479 vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519 vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline] vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239",
    "evidence": "osv:CVE-2026-31599",
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    "severity": "unknown",
    "structured": {
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      "modified": "2026-10-28T02:30:21.980830195Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/07c1e474cf9acf777f09d14a8f8dfcef5b84e46f",
        "https://git.kernel.org/stable/c/2dff11fb5098ae453651f8f77e94ad499c078022",
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        "https://git.kernel.org/stable/c/f8e1fc918a9fe67103bcda01d20d745f264d00a7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31599.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31599",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 488025,
  "published_at": "2026-04-24T14:42:23.961+00:00"
}