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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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      "references": [
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          "url": "https://git.kernel.org/stable/c/f8cccb427e65d725fc0ba05e8900b4676eda268e"
        },
        {
          "url": "https://git.kernel.org/stable/c/60f768d46df561e06d92ffcacc00909f37a0f23d"
        },
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          "url": "https://git.kernel.org/stable/c/80900b5424f3454256153ce386388df43b324f63"
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          "url": "https://git.kernel.org/stable/c/17cb7957c979529cc98ff57f7ac331532f1f7c83"
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          "url": "https://git.kernel.org/stable/c/98c22210aeadce67d9d20059f0dbbd01ba7fdbba"
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          "url": "https://git.kernel.org/stable/c/25f19e476ab15defe698504212899fdb9f7cd61b"
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        },
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          "url": "https://git.kernel.org/stable/c/4bf95f797edd63c93330eafb6d6e670982344b9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0e5a598fe9a4612b852406b51153b881592aede"
        }
      ],
      "title": "media: vidtv: fix nfeeds state corruption on start_streaming failure",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31585",
    "datePublished": "2026-04-24T14:42:14.266Z",
    "dateReserved": "2026-03-09T15:48:24.120Z",
    "dateUpdated": "2026-06-14T17:42:17.844Z",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: blk-cgroup: fix use-after-free in cgwb_release_workfn()\n\ncgwb_release_workfn() calls css_put(wb-\u003eblkcg_css) and then later accesses\nwb-\u003eblkcg_css again via blkcg_unpin_online().  If css_put() drops the last\nreference, the blkcg can be freed asynchronously (css_free_rwork_fn -\u003e\nblkcg_css_free -\u003e kfree) before blkcg_unpin_online() dereferences the\npointer to access blkcg-\u003eonline_pin, resulting in a use-after-free:\n\n  BUG: KASAN: slab-use-after-free in blkcg_unpin_online (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 block/blk-cgroup.c:1367)\n  Write of size 4 at addr ff11000117aa6160 by task kworker/71:1/531\n   Workqueue: cgwb_release cgwb_release_workfn\n   Call Trace:\n    \u003cTASK\u003e\n     blkcg_unpin_online (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 block/blk-cgroup.c:1367)\n     cgwb_release_workfn (mm/backing-dev.c:629)\n     process_scheduled_works (kernel/workqueue.c:3278 kernel/workqueue.c:3385)\n\n   Freed by task 1016:\n    kfree (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6246 mm/slub.c:6561)\n    css_free_rwork_fn (kernel/cgroup/cgroup.c:5542)\n    process_scheduled_works (kernel/workqueue.c:3302 kernel/workqueue.c:3385)\n\n** Stack based on commit 66672af7a095 (\"Add linux-next specific files\nfor 20260410\")\n\nI am seeing this crash sporadically in Meta fleet across multiple kernel\nversions.  A full reproducer is available at:\nhttps://github.com/leitao/debug/blob/main/reproducers/repro_blkcg_uaf.sh\n\n(The race window is narrow.  To make it easily reproducible, inject a\nmsleep(100) between css_put() and blkcg_unpin_online() in\ncgwb_release_workfn().  With that delay and a KASAN-enabled kernel, the\nreproducer triggers the splat reliably in less than a second.)\n\nFix this by moving blkcg_unpin_online() before css_put(), so the\ncgwb\u0027s CSS reference keeps the blkcg alive while blkcg_unpin_online()\naccesses it."
        }
      ],
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          "url": "https://git.kernel.org/stable/c/23acef4156c260e8598397a1a2e8b3a23e919893"
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          "url": "https://git.kernel.org/stable/c/1bd36e93b542d9dd020190c6607c6a3663405195"
        },
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          "url": "https://git.kernel.org/stable/c/740ba1ebb223f137ff088ab74d533a13f9167bd8"
        },
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          "url": "https://git.kernel.org/stable/c/115a5266749dcde7fe4127e8623d19c752088f69"
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          "url": "https://git.kernel.org/stable/c/dfc8292a1d6782c76b626315605e0585a5a18447"
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          "url": "https://git.kernel.org/stable/c/ea3af09eb87d8f8708c66747fcf1a2762902e839"
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          "url": "https://git.kernel.org/stable/c/50879a3c1faf06e661090015d59e2127255cff27"
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        {
          "url": "https://git.kernel.org/stable/c/67cb119d32f35e32acd0393bbeb318b2bb1fdafe"
        },
        {
          "url": "https://git.kernel.org/stable/c/8f5857be99f1ed1fa80991c72449541f634626ee"
        }
      ],
      "title": "mm: blk-cgroup: fix use-after-free in cgwb_release_workfn()",
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