CVE-2026-89893 (GCVE-0-2026-89893)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:31 – Updated: 2026-09-16 14:39
VLAI
Title
media: cx23885: cancel NetUP CI work before teardown
Summary
In the Linux kernel, the following vulnerability has been resolved: media: cx23885: cancel NetUP CI work before teardown netup_ci_exit() frees a netup_ci_state while its work item, netup_read_ci_status(), may still be pending or running on the system workqueue. The worker obtains the state with container_of() and dereferences it, so it must not outlive the state. netup_ci_init() queues the initial status read, and CI GPIO interrupts subsequently queue the same work from netup_ci_slot_status(). During remove, cx23885_finidev() calls free_irq() before the CI device is unregistered. free_irq() prevents further IRQ handlers from running, but does not drain work queued previously, so the worker can run after netup_ci_exit() frees the state. Call cancel_work_sync() before dvb_ca_en50221_release() and kfree(). This issue was found by an in-house static analysis tool.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c184dcd282337c09695a4c1761d7ac77fdc8fb7d , < aaf76794b870b0f391eff339252a2e2e22f33a4a (git)
Affected: c184dcd282337c09695a4c1761d7ac77fdc8fb7d , < f7ff5adb63c1b277565afa54ccc0924d841b4a52 (git)
Affected: c184dcd282337c09695a4c1761d7ac77fdc8fb7d , < 140ecbcbf978fbe60f83f8d4f8b1199029a5c763 (git)
Affected: c184dcd282337c09695a4c1761d7ac77fdc8fb7d , < ec82b0cf7f75fd95802592dcc9560fc7f529bba4 (git)
Affected: c184dcd282337c09695a4c1761d7ac77fdc8fb7d , < 5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5 (git)
Affected: c184dcd282337c09695a4c1761d7ac77fdc8fb7d , < bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146 (git)
Affected: c184dcd282337c09695a4c1761d7ac77fdc8fb7d , < 99cd62b9b1c818d6d01a87be9a8e5796314150a2 (git)
Affected: c184dcd282337c09695a4c1761d7ac77fdc8fb7d , < 4e143d662ca94888b494b2427fc9e34494eb933a (git)
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Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (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)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cx23885: cancel NetUP CI work before teardown\n\nnetup_ci_exit() frees a netup_ci_state while its work item,\nnetup_read_ci_status(), may still be pending or running on the system\nworkqueue. The worker obtains the state with container_of() and\ndereferences it, so it must not outlive the state.\n\nnetup_ci_init() queues the initial status read, and CI GPIO interrupts\nsubsequently queue the same work from netup_ci_slot_status(). During\nremove, cx23885_finidev() calls free_irq() before the CI device is\nunregistered. free_irq() prevents further IRQ handlers from running,\nbut does not drain work queued previously, so the worker can run after\nnetup_ci_exit() frees the state.\n\nCall cancel_work_sync() before dvb_ca_en50221_release() and kfree().\n\nThis issue was found by an in-house static analysis tool."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The use-after-free is reached only on local PCI teardown of the NetUP Dual DVB-S2 CI card (cx23885_finidev \u2192 cx23885_dvb_unregister \u2192 netup_ci_exit) via sysfs unbind/remove, rmmod, or local PCI hot-remove. No network, adjacent-network, or remote-peer path queues netup_read_ci_status or frees netup_ci_state.\nAC:L - netup_ci_init() unconditionally schedule_work()s the status worker, and CAM GPIO IRQs re-queue it via netup_ci_slot_status(); an attacker who then unbinds/rebinds controls both sides of the missing cancel_work_sync race. The worker\u0027s 33-byte I2C transfer widens a retryable window, so this UAF is Low complexity.\nPR:L - Per CNA driver-removal UAF precedent on this same NetUP PCIe DVB family (CVE-2023-53219), an unprivileged local video-group/uaccess user on broadcast, HTPC, or set-top systems can spray the freed netup_ci_state while teardown proceeds. Init-namespace root is not required for the UAF itself.\nUI:N - The attacker queues the CI work (driver bind or CAM GPIO) and initiates PCI unbind, rmmod, or hot-remove themselves. No separate victim action such as mounting a filesystem or opening attacker-supplied content is required.\nS:U - The use-after-free corrupts the host kernel netup_ci_state heap object and dvb_ca_en50221 private state within the same security authority. It is not a VM escape, IOMMU/DMA isolation bypass, or sandbox breakout.\nC:H - After kfree(state), netup_read_ci_status recovers the object via container_of() and reads state-\u003eca, i2c_adap, and status from freed memory. Spraying the slab turns this kernel heap UAF into an arbitrary read, which per UAF guidance is Confidentiality High.\nI:H - The dangling worker writes state-\u003estatus/next_status_checked_time and calls dvb_ca_en50221_frda_irq(), which loads ca-\u003epub-\u003eread_cam_control from the freed object, a heap-spray function-pointer hijack. UAF memory corruption is scored Integrity High.\nA:H - Use-after-free of netup_ci_state from workqueue context after kfree, or a NULL deref of ca-\u003eprivate if the worker interleaves dvb_ca_en50221_release, oopses or panics the kernel even when not fully exploited, so availability impact is High."
            }
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      "title": "media: cx23885: cancel NetUP CI work before teardown",
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    "datePublished": "2026-09-16T10:31:55.374Z",
    "dateReserved": "2026-09-11T19:38:34.773Z",
    "dateUpdated": "2026-09-16T14:39:43.386Z",
    "state": "PUBLISHED"
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      "date": "2026-09-25",
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      "percentile": "0.06349"
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      "cve": "CVE-2026-89893",
      "id": "msrc_CVE-2026-89893",
      "initial_release_date": "2026-09-17T01:06:59.000Z",
      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
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      "title": "media: cx23885: cancel NetUP CI work before teardown",
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      "version": "4"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cx23885: cancel NetUP CI work before teardown\n\nnetup_ci_exit() frees a netup_ci_state while its work item,\nnetup_read_ci_status(), may still be pending or running on the system\nworkqueue. The worker obtains the state with container_of() and\ndereferences it, so it must not outlive the state.\n\nnetup_ci_init() queues the initial status read, and CI GPIO interrupts\nsubsequently queue the same work from netup_ci_slot_status(). During\nremove, cx23885_finidev() calls free_irq() before the CI device is\nunregistered. free_irq() prevents further IRQ handlers from running,\nbut does not drain work queued previously, so the worker can run after\nnetup_ci_exit() frees the state.\n\nCall cancel_work_sync() before dvb_ca_en50221_release() and kfree().\n\nThis issue was found by an in-house static analysis tool."
          }
        ],
        "id": "CVE-2026-89893",
        "lastModified": "2026-09-16T15:18:15.647",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-16T11:16:58.000",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/140ecbcbf978fbe60f83f8d4f8b1199029a5c763"
          },
          {
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            "url": "https://git.kernel.org/stable/c/4e143d662ca94888b494b2427fc9e34494eb933a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/aaf76794b870b0f391eff339252a2e2e22f33a4a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ec82b0cf7f75fd95802592dcc9560fc7f529bba4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f7ff5adb63c1b277565afa54ccc0924d841b4a52"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.