CVE-2026-43497

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43497", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.013Z", "datePublished": "2026-05-21T12:12:47.150Z", "dateUpdated": "2026-08-05T12:28:19.915Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:28:19.915Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free\n\ndlfb_ops_mmap() uses remap_pfn_range() to map vmalloc framebuffer pages\nto userspace but sets no vm_ops on the VMA. This means the kernel cannot\ntrack active mmaps. When dlfb_realloc_framebuffer() replaces the backing\nbuffer via FBIOPUT_VSCREENINFO, existing mmap PTEs are not invalidated.\nOn USB disconnect, dlfb_ops_destroy() calls vfree() on the old pages\nwhile userspace PTEs still reference them, resulting in a use-after-free:\nthe process retains read/write access to freed kernel pages.\n\nAdd vm_operations_struct with open/close callbacks that maintain an\natomic mmap_count on struct dlfb_data. In dlfb_realloc_framebuffer(),\ncheck mmap_count and return -EBUSY if the buffer is currently mapped,\npreventing buffer replacement while userspace holds stale PTEs.\n\nTested with PoC using dummy_hcd + raw_gadget USB device emulation."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The entire exploit is driven by local syscalls (open/mmap/FBIOPUT_VSCREENINFO/close) on the /dev/fbN character device; the attacker is a local software user, not a malicious USB device feeding crafted data, so the vector to the vulnerable component is local rather than physical.\nAC:L - The attacker reliably performs the mmap + realloc-via-ioctl + close sequence and can detect the disconnect before closing; the freed-page mapping is then deterministic with no race or uncontrolled memory-layout condition required to trigger the UAF.\nPR:L - Exploitation requires read/write access to the framebuffer device node, which is available to an ordinary logged-in/video-group user (or kiosk app user) but not to a fully unprivileged unauthenticated actor.\nUI:R - The freeing vfree only runs after a USB disconnect (unregister_framebuffer), so completing the exploit depends on a disconnect event (undock/unplug) performed by the user or environment rather than by the attacker's own code.\nS:U - The use-after-free corrupts kernel memory within the same security authority (the kernel); there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The process keeps a read mapping to freed pages that are recycled for arbitrary kernel allocations, allowing disclosure of arbitrary kernel memory.\nI:H - The same mapping retains write access to the freed pages once reused by other kernel objects, providing an arbitrary-write primitive suitable for privilege escalation or control-flow hijack.\nA:H - A use-after-free of freed kernel pages readily causes memory corruption and a kernel panic/oops."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/video/fbdev/udlfb.c", "include/video/udlfb.h"], "versions": [{"version": "7433914efd584b22bb49d3e1eee001f5d0525ecd", "lessThan": "60f711cfd580f86fea8284146ac133804e728f9a", "status": "affected", "versionType": "git"}, {"version": "7433914efd584b22bb49d3e1eee001f5d0525ecd", "lessThan": "5931f5651ee32bd41b3323256b31fcc8e71336ed", "status": "affected", "versionType": "git"}, {"version": "7433914efd584b22bb49d3e1eee001f5d0525ecd", "lessThan": "e3d9865dacd7435b8465848428210d0f0c673311", "status": "affected", "versionType": "git"}, {"version": "7433914efd584b22bb49d3e1eee001f5d0525ecd", "lessThan": "4f312c30f0368e8d2a76aa650dff73f23490b5e7", "status": "affected", "versionType": "git"}, {"version": "7433914efd584b22bb49d3e1eee001f5d0525ecd", "lessThan": 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{}

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This means the kernel cannot\ntrack active mmaps. When dlfb_realloc_framebuffer() replaces the backing\nbuffer via FBIOPUT_VSCREENINFO, existing mmap PTEs are not invalidated.\nOn USB disconnect, dlfb_ops_destroy() calls vfree() on the old pages\nwhile userspace PTEs still reference them, resulting in a use-after-free:\nthe process retains read/write access to freed kernel pages.\n\nAdd vm_operations_struct with open/close callbacks that maintain an\natomic mmap_count on struct dlfb_data. In dlfb_realloc_framebuffer(),\ncheck mmap_count and return -EBUSY if the buffer is currently mapped,\npreventing buffer replacement while userspace holds stale PTEs.\n\nTested with PoC using dummy_hcd + raw_gadget USB device emulation."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfbdev: udlfb: a\u00f1adir vm_ops a dlfb_ops_mmap para prevenir el uso despu\u00e9s de liberaci\u00f3n\n\ndlfb_ops_mmap() utiliza remap_pfn_range() para mapear p\u00e1ginas de framebuffer de vmalloc al espacio de usuario, pero no establece vm_ops en el VMA. Esto significa que el kernel no puede rastrear mmaps activos. Cuando dlfb_realloc_framebuffer() reemplaza el b\u00fafer de respaldo a trav\u00e9s de FBIOPUT_VSCREENINFO, los PTEs de mmap existentes no se invalidan. Al desconectar el USB, dlfb_ops_destroy() llama a vfree() en las p\u00e1ginas antiguas mientras los PTEs del espacio de usuario a\u00fan las referencian, lo que resulta en un uso despu\u00e9s de liberaci\u00f3n: el proceso retiene acceso de lectura/escritura a p\u00e1ginas del kernel liberadas.\n\nA\u00f1adir vm_operations_struct con callbacks de apertura/cierre que mantienen un mmap_count at\u00f3mico en la estructura dlfb_data. En dlfb_realloc_framebuffer(), comprobar mmap_count y devolver -EBUSY si el b\u00fafer est\u00e1 actualmente mapeado, lo que previene el reemplazo del b\u00fafer mientras el espacio de usuario mantiene PTEs obsoletos.\n\nProbado con PoC utilizando emulaci\u00f3n de dispositivo USB dummy_hcd + raw_gadget."}], "id": "CVE-2026-43497", "lastModified": "2026-07-23T16:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-21T13:16:19.090", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/18dd358de72d57993422cbb5dfb29ccd74efe192"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4f312c30f0368e8d2a76aa650dff73f23490b5e7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5931f5651ee32bd41b3323256b31fcc8e71336ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/60f711cfd580f86fea8284146ac133804e728f9a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8de779dc40d35d39fa07387b6f921eb11df0f511"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a2c53a3822ee26e8d758071815b9ed3bf6669fc1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da9b065cedfd3b574f229d5be594e6aa47a27ae6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e3d9865dacd7435b8465848428210d0f0c673311"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free", "id": "2480458", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480458"}, "csaw": false, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's udlfb driver. This use-after-free vulnerability occurs because the dlfb_ops_mmap() function does not properly track active memory mappings. When the framebuffer is reallocated, existing memory page table entries (PTEs) are not invalidated. This allows a local attacker to retain read/write access to freed kernel memory pages, potentially leading to arbitrary code execution or information disclosure."], "name": "CVE-2026-43497", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "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": "2026-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43497\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43497\nhttps://lore.kernel.org/linux-cve-announce/2026052157-CVE-2026-43497-f082@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,4f312c30f0368e8d2a76aa650dff73f23490b5e7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,18dd358de72d57993422cbb5dfb29ccd74efe192)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,da9b065cedfd3b574f229d5be594e6aa47a27ae6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,a2c53a3822ee26e8d758071815b9ed3bf6669fc1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,8de779dc40d35d39fa07387b6f921eb11df0f511)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.140,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.88,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.30,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.7,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-21T13:30:11.213091+00:00", "updated": "2026-08-13T23:45:16.808681+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}