{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89893", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.773Z", "datePublished": "2026-09-16T10:31:55.374Z", "dateUpdated": "2026-10-19T08:54:26.213Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:54:26.213Z" }, "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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "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 → cx23885_dvb_unregister → 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's 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->ca, 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->status/next_status_checked_time and calls dvb_ca_en50221_frda_irq(), which loads ca->pub->read_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->private if the worker interleaves dvb_ca_en50221_release, oopses or panics the kernel even when not fully exploited, so availability impact is High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/pci/cx23885/cimax2.c" ], "versions": [ { "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d", "lessThan": "aaf76794b870b0f391eff339252a2e2e22f33a4a", "status": "affected", "versionType": "git" }, { "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d", "lessThan": "f7ff5adb63c1b277565afa54ccc0924d841b4a52", "status": "affected", "versionType": "git" }, { "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d", "lessThan": "140ecbcbf978fbe60f83f8d4f8b1199029a5c763", "status": "affected", "versionType": "git" }, { "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d", "lessThan": "ec82b0cf7f75fd95802592dcc9560fc7f529bba4", "status": "affected", "versionType": "git" }, { "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d", "lessThan": "5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5", "status": "affected", "versionType": "git" }, { "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d", "lessThan": "bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146", "status": "affected", "versionType": "git" }, { "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d", "lessThan": "99cd62b9b1c818d6d01a87be9a8e5796314150a2", "status": "affected", "versionType": "git" }, { "version": "c184dcd282337c09695a4c1761d7ac77fdc8fb7d", "lessThan": "4e143d662ca94888b494b2427fc9e34494eb933a", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/pci/cx23885/cimax2.c" ], "versions": [ { "version": "2.6.30", "status": "affected" }, { "version": "0", "lessThan": "2.6.30", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.3" } ] } ] } ], "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" } } } }