CVE-2026-31585 (GCVE-0-2026-31585)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-24 14:42
VLAI?
Title
media: vidtv: fix nfeeds state corruption on start_streaming failure
Summary
In the Linux kernel, the following vulnerability has been resolved: media: vidtv: fix nfeeds state corruption on start_streaming failure syzbot reported a memory leak in vidtv_psi_service_desc_init [1]. When vidtv_start_streaming() fails inside vidtv_start_feed(), the nfeeds counter is left incremented even though no feed was actually started. This corrupts the driver state: subsequent start_feed calls see nfeeds > 1 and skip starting the mux, while stop_feed calls eventually try to stop a non-existent stream. This state corruption can also lead to memory leaks, since the mux and channel resources may be partially allocated during a failed start_streaming but never cleaned up, as the stop path finds dvb->streaming == false and returns early. Fix by decrementing nfeeds back when start_streaming fails, keeping the counter in sync with the actual number of active feeds. [1] BUG: memory leak unreferenced object 0xffff888145b50820 (size 32): comm "syz.0.17", pid 6068, jiffies 4294944486 backtrace (crc 90a0c7d4): vidtv_psi_service_desc_init+0x74/0x1b0 drivers/media/test-drivers/vidtv/vidtv_psi.c:288 vidtv_channel_s302m_init+0xb1/0x2a0 drivers/media/test-drivers/vidtv/vidtv_channel.c:83 vidtv_channels_init+0x1b/0x40 drivers/media/test-drivers/vidtv/vidtv_channel.c:524 vidtv_mux_init+0x516/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:518 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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 98c22210aeadce67d9d20059f0dbbd01ba7fdbba (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 25f19e476ab15defe698504212899fdb9f7cd61b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 83110c2c8c46c035c2e0fc8ff3e4991183bf9ccd (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4bf95f797edd63c93330eafb6d6e670982344b9b (git)
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    Linux Linux Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/media/test-drivers/vidtv/vidtv_bridge.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: vidtv: fix nfeeds state corruption on start_streaming failure\n\nsyzbot reported a memory leak in vidtv_psi_service_desc_init [1].\n\nWhen vidtv_start_streaming() fails inside vidtv_start_feed(), the\nnfeeds counter is left incremented even though no feed was actually\nstarted. This corrupts the driver state: subsequent start_feed calls\nsee nfeeds \u003e 1 and skip starting the mux, while stop_feed calls\neventually try to stop a non-existent stream.\n\nThis state corruption can also lead to memory leaks, since the mux\nand channel resources may be partially allocated during a failed\nstart_streaming but never cleaned up, as the stop path finds\ndvb-\u003estreaming == false and returns early.\n\nFix by decrementing nfeeds back when start_streaming fails, keeping\nthe counter in sync with the actual number of active feeds.\n\n[1]\nBUG: memory leak\nunreferenced object 0xffff888145b50820 (size 32):\n comm \"syz.0.17\", pid 6068, jiffies 4294944486\n backtrace (crc 90a0c7d4):\n  vidtv_psi_service_desc_init+0x74/0x1b0 drivers/media/test-drivers/vidtv/vidtv_psi.c:288\n  vidtv_channel_s302m_init+0xb1/0x2a0 drivers/media/test-drivers/vidtv/vidtv_channel.c:83\n  vidtv_channels_init+0x1b/0x40 drivers/media/test-drivers/vidtv/vidtv_channel.c:524\n  vidtv_mux_init+0x516/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:518\n  vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline]\n  vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239"
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/4bf95f797edd63c93330eafb6d6e670982344b9b"
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      "title": "media: vidtv: fix nfeeds state corruption on start_streaming failure",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31585",
    "datePublished": "2026-04-24T14:42:14.266Z",
    "dateReserved": "2026-03-09T15:48:24.120Z",
    "dateUpdated": "2026-04-24T14:42:14.266Z",
    "state": "PUBLISHED"
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}


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