CVE-2026-89893 (GCVE-0-2026-89893)
Vulnerability from cvelistv5
Published
2026-09-16 10:31
Modified
2026-10-19 08:54
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: c184dcd282337c09695a4c1761d7ac77fdc8fb7d
Version: c184dcd282337c09695a4c1761d7ac77fdc8fb7d
Version: c184dcd282337c09695a4c1761d7ac77fdc8fb7d
Version: c184dcd282337c09695a4c1761d7ac77fdc8fb7d
Version: c184dcd282337c09695a4c1761d7ac77fdc8fb7d
Version: c184dcd282337c09695a4c1761d7ac77fdc8fb7d
Version: c184dcd282337c09695a4c1761d7ac77fdc8fb7d
Version: c184dcd282337c09695a4c1761d7ac77fdc8fb7d
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/pci/cx23885/cimax2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "aaf76794b870b0f391eff339252a2e2e22f33a4a",
              "status": "affected",
              "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d",
              "versionType": "git"
            },
            {
              "lessThan": "f7ff5adb63c1b277565afa54ccc0924d841b4a52",
              "status": "affected",
              "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d",
              "versionType": "git"
            },
            {
              "lessThan": "140ecbcbf978fbe60f83f8d4f8b1199029a5c763",
              "status": "affected",
              "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d",
              "versionType": "git"
            },
            {
              "lessThan": "ec82b0cf7f75fd95802592dcc9560fc7f529bba4",
              "status": "affected",
              "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d",
              "versionType": "git"
            },
            {
              "lessThan": "5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5",
              "status": "affected",
              "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d",
              "versionType": "git"
            },
            {
              "lessThan": "bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146",
              "status": "affected",
              "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d",
              "versionType": "git"
            },
            {
              "lessThan": "99cd62b9b1c818d6d01a87be9a8e5796314150a2",
              "status": "affected",
              "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d",
              "versionType": "git"
            },
            {
              "lessThan": "4e143d662ca94888b494b2427fc9e34494eb933a",
              "status": "affected",
              "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/pci/cx23885/cimax2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.30"
            },
            {
              "lessThan": "2.6.30",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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",
            "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:54:26.213Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aaf76794b870b0f391eff339252a2e2e22f33a4a"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7ff5adb63c1b277565afa54ccc0924d841b4a52"
        },
        {
          "url": "https://git.kernel.org/stable/c/140ecbcbf978fbe60f83f8d4f8b1199029a5c763"
        },
        {
          "url": "https://git.kernel.org/stable/c/ec82b0cf7f75fd95802592dcc9560fc7f529bba4"
        },
        {
          "url": "https://git.kernel.org/stable/c/5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146"
        },
        {
          "url": "https://git.kernel.org/stable/c/99cd62b9b1c818d6d01a87be9a8e5796314150a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e143d662ca94888b494b2427fc9e34494eb933a"
        }
      ],
      "title": "media: cx23885: cancel NetUP CI work before teardown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89893",
    "datePublished": "2026-09-16T10:31:55.374Z",
    "dateReserved": "2026-09-11T19:38:34.773Z",
    "dateUpdated": "2026-10-19T08:54:26.213Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.