CVE-2026-23253

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The open path only needs to\nreset the buffer data pointer, size, and read/write positions.\n\nReplace the dvb_ringbuffer_init() call in dvb_dvr_open() with direct\nassignment of data/size and a call to dvb_ringbuffer_reset(), which\nproperly resets pread, pwrite, and error with correct memory ordering\nwithout touching the waitqueue or spinlock."}], "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 in the DVB DVR device driver, accessible via opening /dev/dvb/adapter*/dvr* character device files. This requires local system access.\nAC:L - The attacker controls both sides of the race \u2014 closing a DVR fd from one thread while reopening it from another. The attacker can reliably trigger the waitqueue reinitialization while stale entries exist.\nPR:L - DVB device files are typically accessible to local users (e.g., via \"video\" group membership). On Android phones, set-top boxes, and embedded media devices, the device user has access to DVB hardware. No elevated privileges are required.\nUI:N - No user interaction is needed. The attacker can open, poll, close, and reopen the DVR device entirely on their own.\nS:U - The vulnerability operates within the kernel's security authority. There is no crossing of security boundaries like VM escape or IOMMU bypass.\nC:H - The waitqueue list corruption creates orphaned entries with stale pointers, which is a use-after-free primitive. UAF gives the attacker control over freed memory contents, enabling arbitrary kernel memory reads.\nI:H - The list corruption from the orphaned waitqueue entries provides write primitives through stale prev/next pointer manipulation. This is a classic kernel list corruption that can be leveraged for arbitrary write and code execution via heap spraying.\nA:H - The stale list pointers will cause a kernel crash/oops when the orphaned wait_queue_entry is removed, as it dereferences corrupted prev/next pointers. This was confirmed by syzbot."}]}], "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/dmxdev.c"], "versions": [{"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "527cfa8a3486b3555c5c15e2f62be484a11398dc", "status": "affected", "versionType": "git"}, {"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "fb378cf89be434ed1f10ab79cc4788fba8ae868d", "status": "affected", "versionType": "git"}, {"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "f1e520ca2e83ece6731af6167c9e5e16931ecba0", "status": "affected", "versionType": "git"}, {"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "af050ab44fa1b1897a940d7d756e512232f5e5df", "status": "affected", "versionType": "git"}, {"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": 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This requires local system access.\nAC:L - The attacker controls both sides of the race \u2014 closing a DVR fd from one thread while reopening it from another. The attacker can reliably trigger the waitqueue reinitialization while stale entries exist.\nPR:L - DVB device files are typically accessible to local users (e.g., via \"video\" group membership). On Android phones, set-top boxes, and embedded media devices, the device user has access to DVB hardware. No elevated privileges are required.\nUI:N - No user interaction is needed. The attacker can open, poll, close, and reopen the DVR device entirely on their own.\nS:U - The vulnerability operates within the kernel's security authority. There is no crossing of security boundaries like VM escape or IOMMU bypass.\nC:H - The waitqueue list corruption creates orphaned entries with stale pointers, which is a use-after-free primitive. UAF gives the attacker control over freed memory contents, enabling arbitrary kernel memory reads.\nI:H - The list corruption from the orphaned waitqueue entries provides write primitives through stale prev/next pointer manipulation. This is a classic kernel list corruption that can be leveraged for arbitrary write and code execution via heap spraying.\nA:H - The stale list pointers will cause a kernel crash/oops when the orphaned wait_queue_entry is removed, as it dereferences corrupted prev/next pointers. This was confirmed by syzbot."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "527cfa8a3486b3555c5c15e2f62be484a11398dc", "versionType": "git"}, {"status": "affected", "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "fb378cf89be434ed1f10ab79cc4788fba8ae868d", "versionType": "git"}, {"status": "affected", "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "f1e520ca2e83ece6731af6167c9e5e16931ecba0", "versionType": "git"}, {"status": "affected", "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "af050ab44fa1b1897a940d7d756e512232f5e5df", "versionType": "git"}, {"status": "affected", "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "d71781bad59b1c9d60d7068004581f9bf19c0c9d", "versionType": "git"}, {"status": "affected", "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "cfd94642025e6f71c8f754bdec0800ee95e4f3dd", "versionType": "git"}, {"status": "affected", "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "32eb8e4adc207ef31bc6e5ae56bab940b0176066", "versionType": "git"}, {"status": "affected", "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222", "lessThan": "bfbc0b5b32a8f28ce284add619bf226716a59bc0", "versionType": "git"}], "programFiles": ["drivers/media/dvb-core/dmxdev.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.17"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.17", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.253", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.203", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.167", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.130", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.77", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.17", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.7", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/media/dvb-core/dmxdev.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc"}, {"url": "https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d"}, {"url": "https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0"}, {"url": "https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df"}, {"url": "https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d"}, {"url": "https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd"}, {"url": "https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066"}, {"url": "https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: dvb-core: fix wrong reinitialization of ringbuffer on reopen\n\ndvb_dvr_open() calls dvb_ringbuffer_init() when a new reader opens the\nDVR device. dvb_ringbuffer_init() calls init_waitqueue_head(), which\nreinitializes the waitqueue list head to empty.\n\nSince dmxdev->dvr_buffer.queue is a shared waitqueue (all opens of the\nsame DVR device share it), this orphans any existing waitqueue entries\nfrom io_uring poll or epoll, leaving them with stale prev/next pointers\nwhile the list head is reset to {self, self}.\n\nThe waitqueue and spinlock in dvr_buffer are already properly\ninitialized once in dvb_dmxdev_init(). The open path only needs to\nreset the buffer data pointer, size, and read/write positions.\n\nReplace the dvb_ringbuffer_init() call in dvb_dvr_open() with direct\nassignment of data/size and a call to dvb_ringbuffer_reset(), which\nproperly resets pread, pwrite, and error with correct memory ordering\nwithout touching the waitqueue or spinlock."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.253", "versionStartIncluding": "2.6.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.203", "versionStartIncluding": "2.6.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.167", "versionStartIncluding": "2.6.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.130", "versionStartIncluding": "2.6.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.77", "versionStartIncluding": "2.6.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.17", "versionStartIncluding": "2.6.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.7", "versionStartIncluding": "2.6.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "2.6.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:57.385Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23253", "state": "PUBLISHED", "dateUpdated": "2026-10-19T18:35:40.421Z", "dateReserved": "2026-01-13T15:37:45.990Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-03-18T17:01:44.126Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The open path only needs to\nreset the buffer data pointer, size, and read/write positions.\n\nReplace the dvb_ringbuffer_init() call in dvb_dvr_open() with direct\nassignment of data/size and a call to dvb_ringbuffer_reset(), which\nproperly resets pread, pwrite, and error with correct memory ordering\nwithout touching the waitqueue or spinlock."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmedia: dvb-core: corrige la reinicializaci\u00f3n incorrecta del b\u00fafer circular al reabrir\n\ndvb_dvr_open() llama a dvb_ringbuffer_init() cuando un nuevo lector abre el dispositivo DVR. dvb_ringbuffer_init() llama a init_waitqueue_head(), lo que reinicializa la cabecera de la lista de la cola de espera a vac\u00eda.\n\nDado que dmxdev->dvr_buffer.queue es una cola de espera compartida (todas las aperturas del mismo dispositivo DVR la comparten), esto deja hu\u00e9rfanas las entradas existentes de la cola de espera de io_uring poll o epoll, dej\u00e1ndolas con punteros prev/next obsoletos mientras la cabecera de la lista se restablece a {self, self}.\n\nLa cola de espera y el spinlock en dvr_buffer ya est\u00e1n correctamente inicializados una vez en dvb_dmxdev_init(). La ruta de apertura solo necesita restablecer el puntero de datos del b\u00fafer, el tama\u00f1o y las posiciones de lectura/escritura.\n\nReemplace la llamada a dvb_ringbuffer_init() en dvb_dvr_open() con la asignaci\u00f3n directa de datos/tama\u00f1o y una llamada a dvb_ringbuffer_reset(), que restablece correctamente pread, pwrite y error con el ordenamiento de memoria correcto sin tocar la cola de espera o el spinlock."}], "id": "CVE-2026-23253", "lastModified": "2026-10-19T19:17:43.880", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23253", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:07:02.099167Z", "version": "2.0.3"}}]}, "published": "2026-03-18T18:16:23.383", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-665"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: media: dvb-core: fix wrong reinitialization of ringbuffer on reopen", "id": "2448685", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448685"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23253", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-03-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23253\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23253\nhttps://lore.kernel.org/linux-cve-announce/2026031846-CVE-2026-23253-b1c6@gregkh/T"], "threat_severity": "Moderate"}

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