{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50291", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T19:36:19.985Z", "datePublished": "2024-11-19T01:30:36.685Z", "dateUpdated": "2026-08-05T11:43:07.952Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:43:07.952Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: dvb-core: add missing buffer index check\n\ndvb_vb2_expbuf() didn't check if the given buffer index was\nfor a valid buffer. Add this check." } ], "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 vulnerability is reached only via the DMX_EXPBUF ioctl on the local DVB demux/dvr character devices (/dev/dvb/adapterN/demuxN, dvrN); no network or remote data path reaches dvb_vb2_expbuf().\nAC:L - The attacker fully controls exp->index and the preceding DMX_REQBUFS state, so the out-of-bounds pointer fetch is deterministic on every attempt with no race, timing, or uncontrollable memory-layout precondition.\nPR:L - No capable()/CAP_* check exists on the open or ioctl path; only an open file descriptor on the DVB demux node is needed, which unprivileged users in the standard `video` group (desktops, set-top boxes, media appliances) hold.\nUI:N - The attacker performs the entire sequence (open, DMX_REQBUFS, DMX_EXPBUF) itself; no victim action or cooperation is required.\nS:U - The out-of-bounds access and its consequences are confined to the kernel's own security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The attacker-chosen 32-bit index yields an out-of-bounds read at an arbitrary offset from a kernel heap object, and the resulting forged vb2_buffer/mem_priv is used to build a dma_buf fd handed back to userspace whose vaddr can be mmap'd, exposing arbitrary kernel memory.\nI:H - The forged struct vb2_buffer * is dereferenced through call_ptr_memop as vb->vb2_queue->mem_ops->get_dmabuf(), an attacker-influenced indirect call, and the exported dma_buf mapping is writable, giving arbitrary kernel memory write and control-flow hijack potential.\nA:H - An index between the allocated buffer count and 32 returns a NULL slot that vb2_core_expbuf() immediately dereferences, and larger indices dereference wild pointers, producing a reliable kernel oops/panic on demand." } ] } ], "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_vb2.c" ], "versions": [ { "version": "7dc866df40127dceac9ba83ae16c0c11e7d1666f", "lessThan": "721c37af0355cc0b540909c57fd7930dc99c72d8", "status": "affected", "versionType": "git" }, { "version": "7dc866df40127dceac9ba83ae16c0c11e7d1666f", "lessThan": "fa88dc7db176c79b50adb132a56120a1d4d9d18b", "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_vb2.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.8", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "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": "6.8", "versionEndExcluding": "6.11.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/721c37af0355cc0b540909c57fd7930dc99c72d8" }, { "url": "https://git.kernel.org/stable/c/fa88dc7db176c79b50adb132a56120a1d4d9d18b" } ], "title": "media: dvb-core: add missing buffer index check", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-50291", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2025-10-01T20:14:21.168376Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-129", "description": "CWE-129 Improper Validation of Array Index" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:17:21.088Z" } } ] } }