CVE-2026-89900 (GCVE-0-2026-89900)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 10:32
VLAI
Title
media: cec: core: Fix kmemleak due to missed rc_free_device() call
Summary
In the Linux kernel, the following vulnerability has been resolved: media: cec: core: Fix kmemleak due to missed rc_free_device() call The commit dccc0c3ddf8f ("media: rc: fix race between unregister and urb/irq callbacks") removed the implicit call to rc_free_device() from rc_unregister_device(). However, the commit missed to remove the NULL assignment of adap->rc that is now causing rc_free_device() to never be called on an allocated rc device. kmemleak reports following after e.g. dw-hdmi unbind: unreferenced object 0xffff00010ac10000 (size 4096): comm "kworker/u16:1", pid 39, jiffies 4294897739 hex dump (first 32 bytes): 20 23 4b 0a 01 00 ff ff 08 00 c1 0a 01 00 ff ff #K............. 08 00 c1 0a 01 00 ff ff 00 00 00 00 00 00 00 00 ................ backtrace (crc e11baccc): kmemleak_alloc+0x38/0x44 __kmalloc_cache_noprof+0x4a8/0x5e0 rc_allocate_device+0x48/0x2a0 cec_allocate_adapter+0x3ac/0x800 dw_hdmi_cec_probe+0x264/0x634 platform_probe+0xc0/0x188 really_probe+0x4a4/0x8e0 __driver_probe_device+0x2f8/0x440 driver_probe_device+0x60/0x160 __device_attach_driver+0x1a0/0x2a0 bus_for_each_drv+0x100/0x1a0 __device_attach+0x174/0x350 device_initial_probe+0x90/0xb0 bus_probe_device+0x4c/0x120 device_add+0xdec/0x116c platform_device_add+0x354/0x598 Remove the assignment of adap->rc to NULL to let cec_delete_adapter() free the allocated rc device after last user of the cec device exits to fix the kmemleak.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a7becb58f6b8a3a3efe5d3acfd52e2c107de6772 , < 954ee95a03b4d31d4505591bfaba02c24b75776b (git)
Affected: 75977f5f5c4974c72bbedefbf09ad33ebbaa36f1 , < f28a8e1ba4d67a18e4662e5acefd5a4389322366 (git)
Affected: e250b672d40a9e0d97a8895cbb301248bea0fce6 , < 695063fc57574dd117b1bc750ca189cf03a2caad (git)
Affected: dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 , < cca2407794795cecff7f8e5f5a79f4ef6b1d6f6c (git)
Affected: dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 , < a24ba0653f7154e671dc8d2bf64682ab2d042792 (git)
Affected: 6.6.143 , < 6.6.157 (semver)
Affected: 6.12.93 , < 6.12.110 (semver)
Affected: 6.18.35 , < 6.18.51 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cec: core: Fix kmemleak due to missed rc_free_device() call\n\nThe commit dccc0c3ddf8f (\"media: rc: fix race between unregister and\nurb/irq callbacks\") removed the implicit call to rc_free_device() from\nrc_unregister_device(). However, the commit missed to remove the NULL\nassignment of adap-\u003erc that is now causing rc_free_device() to never be\ncalled on an allocated rc device.\n\nkmemleak reports following after e.g. dw-hdmi unbind:\n\nunreferenced object 0xffff00010ac10000 (size 4096):\n  comm \"kworker/u16:1\", pid 39, jiffies 4294897739\n  hex dump (first 32 bytes):\n    20 23 4b 0a 01 00 ff ff 08 00 c1 0a 01 00 ff ff   #K.............\n    08 00 c1 0a 01 00 ff ff 00 00 00 00 00 00 00 00  ................\n  backtrace (crc e11baccc):\n    kmemleak_alloc+0x38/0x44\n    __kmalloc_cache_noprof+0x4a8/0x5e0\n    rc_allocate_device+0x48/0x2a0\n    cec_allocate_adapter+0x3ac/0x800\n    dw_hdmi_cec_probe+0x264/0x634\n    platform_probe+0xc0/0x188\n    really_probe+0x4a4/0x8e0\n    __driver_probe_device+0x2f8/0x440\n    driver_probe_device+0x60/0x160\n    __device_attach_driver+0x1a0/0x2a0\n    bus_for_each_drv+0x100/0x1a0\n    __device_attach+0x174/0x350\n    device_initial_probe+0x90/0xb0\n    bus_probe_device+0x4c/0x120\n    device_add+0xdec/0x116c\n    platform_device_add+0x354/0x598\n\nRemove the assignment of adap-\u003erc to NULL to let cec_delete_adapter()\nfree the allocated rc device after last user of the cec device exits to\nfix the kmemleak."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T10:32:00.289Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/954ee95a03b4d31d4505591bfaba02c24b75776b"
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          "url": "https://git.kernel.org/stable/c/a24ba0653f7154e671dc8d2bf64682ab2d042792"
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      ],
      "title": "media: cec: core: Fix kmemleak due to missed rc_free_device() call",
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    "dateReserved": "2026-09-11T19:38:34.774Z",
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    "state": "PUBLISHED"
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      "source": "Microsoft CSAF VEX",
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      "title": "media: cec: core: Fix kmemleak due to missed rc_free_device() call",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89900.json",
      "version": "2"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cec: core: Fix kmemleak due to missed rc_free_device() call\n\nThe commit dccc0c3ddf8f (\"media: rc: fix race between unregister and\nurb/irq callbacks\") removed the implicit call to rc_free_device() from\nrc_unregister_device(). However, the commit missed to remove the NULL\nassignment of adap-\u003erc that is now causing rc_free_device() to never be\ncalled on an allocated rc device.\n\nkmemleak reports following after e.g. dw-hdmi unbind:\n\nunreferenced object 0xffff00010ac10000 (size 4096):\n  comm \"kworker/u16:1\", pid 39, jiffies 4294897739\n  hex dump (first 32 bytes):\n    20 23 4b 0a 01 00 ff ff 08 00 c1 0a 01 00 ff ff   #K.............\n    08 00 c1 0a 01 00 ff ff 00 00 00 00 00 00 00 00  ................\n  backtrace (crc e11baccc):\n    kmemleak_alloc+0x38/0x44\n    __kmalloc_cache_noprof+0x4a8/0x5e0\n    rc_allocate_device+0x48/0x2a0\n    cec_allocate_adapter+0x3ac/0x800\n    dw_hdmi_cec_probe+0x264/0x634\n    platform_probe+0xc0/0x188\n    really_probe+0x4a4/0x8e0\n    __driver_probe_device+0x2f8/0x440\n    driver_probe_device+0x60/0x160\n    __device_attach_driver+0x1a0/0x2a0\n    bus_for_each_drv+0x100/0x1a0\n    __device_attach+0x174/0x350\n    device_initial_probe+0x90/0xb0\n    bus_probe_device+0x4c/0x120\n    device_add+0xdec/0x116c\n    platform_device_add+0x354/0x598\n\nRemove the assignment of adap-\u003erc to NULL to let cec_delete_adapter()\nfree the allocated rc device after last user of the cec device exits to\nfix the kmemleak."
          }
        ],
        "id": "CVE-2026-89900",
        "lastModified": "2026-09-16T11:16:58.880",
        "metrics": {},
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        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-23T14:09:57+00:00",
      "cve": "CVE-2026-89900",
      "id": "CVE-2026-89900",
      "initial_release_date": "2026-09-16T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: media: cec: core: Fix kmemleak due to missed rc_free_device() call",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89900.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-09-19T01:43:17Z",
      "cve": "CVE-2026-89900",
      "id": "CVE-2026-89900",
      "initial_release_date": "2026-09-17T16:35:36Z",
      "product_status:known_not_affected": "347",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89900",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89900.json",
      "version": "3"
    }
  }
}



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