{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50274", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-15T13:58:00.975Z", "datePublished": "2025-09-15T14:21:10.383Z", "dateUpdated": "2026-08-05T08:58:01.283Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:01.283Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: dvbdev: adopts refcnt to avoid UAF\n\ndvb_unregister_device() is known that prone to use-after-free.\nThat is, the cleanup from dvb_unregister_device() releases the dvb_device\neven if there are pointers stored in file->private_data still refer to it.\n\nThis patch adds a reference counter into struct dvb_device and delays its\ndeallocation until no pointer refers to the object." } ], "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 UAF is reached through local chardev operations on /dev/dvb/adapterX/* (open/ioctl/release). Unregister while an fd remains open is triggered by device teardown (USB/FireWire/PCI DVB hot-unplug or driver removal); this is a local device-node attack path, consistent with related dvbdev UAFs (e.g. CVE-2024-27043).\nAC:L - An attacker who opens a DVB node and then causes or observes device unregister (e.g. unplugging a USB/FireWire DVB adapter they control, or teardown on drivers that call dvb_unregister_device without waiting) reliably leaves file->private_data dangling; no uncontrolled race or rare config is required.\nPR:L - Access requires only an unprivileged local user able to open DVB nodes (udev assigns GROUP=video and TAG=uaccess), not root or init-namespace CAP_SYS_ADMIN.\nUI:N - The attacker can open the device and drive subsequent ioctls/close themselves; no separate victim action is required once they have local access and can induce or time device teardown.\nS:U - Impact is confined to the host kernel's privilege domain (local privilege escalation / memory corruption); there is no VM, IOMMU, or other security-authority boundary crossing.\nC:H - Use-after-free of struct dvb_device via file->private_data enables heap reuse and arbitrary read primitives through subsequent ioctl/release paths (per UAF guidance).\nI:H - The same UAF on a kmalloc object used for ioctl dispatch (dvb_generic_ioctl → dvbdev->kernel_ioctl) enables heap spraying and control-flow/write primitives for code execution.\nA:H - Dereferencing the freed dvb_device on ioctl or release causes kernel oops/crash even without full exploitation; UAF 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/dvb-core/dvb_ca_en50221.c", "drivers/media/dvb-core/dvb_frontend.c", "drivers/media/dvb-core/dvbdev.c", "include/media/dvbdev.h" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "ac521bbe3d00fa574e66a9361763f2b37725bc97", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "219b44bf94203bd433aa91b7796475bf656348e5", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6d18b44bb44e1f4d97dfe0efe92ac0f0984739c2", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2abd73433872194bccdf1432a0980e4ec5273c2a", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "88a6f8a72d167294c0931c7874941bf37a41b6dd", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "a2f0a08aa613176c9688c81d7b598a7779974991", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9945d05d6693710574f354c5dbddc47f5101eb77", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "0fc044b2b5e2d05a1fa1fb0d7f270367a7855d79", "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/dvb-core/dvb_ca_en50221.c", "drivers/media/dvb-core/dvb_frontend.c", "drivers/media/dvb-core/dvbdev.c", "include/media/dvbdev.h" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.303", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.270", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.86", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.16", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.2", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "2.6.12", "versionEndExcluding": "4.14.303" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "4.19.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.0.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ac521bbe3d00fa574e66a9361763f2b37725bc97" }, { "url": "https://git.kernel.org/stable/c/219b44bf94203bd433aa91b7796475bf656348e5" }, { "url": "https://git.kernel.org/stable/c/6d18b44bb44e1f4d97dfe0efe92ac0f0984739c2" }, { "url": "https://git.kernel.org/stable/c/2abd73433872194bccdf1432a0980e4ec5273c2a" }, { "url": "https://git.kernel.org/stable/c/88a6f8a72d167294c0931c7874941bf37a41b6dd" }, { "url": "https://git.kernel.org/stable/c/a2f0a08aa613176c9688c81d7b598a7779974991" }, { "url": "https://git.kernel.org/stable/c/9945d05d6693710574f354c5dbddc47f5101eb77" }, { "url": "https://git.kernel.org/stable/c/0fc044b2b5e2d05a1fa1fb0d7f270367a7855d79" } ], "title": "media: dvbdev: adopts refcnt to avoid UAF", "x_generator": { "engine": "bippy-1.2.0" } } } }