{"api_version":"1","generated_at":"2026-05-29T22:02:21+00:00","cve":"CVE-2026-43497","urls":{"html":"https://cve.report/CVE-2026-43497","api":"https://cve.report/api/cve/CVE-2026-43497.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43497","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43497"},"summary":{"title":"fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-21 13:16:19","updated_at":"2026-05-21 13:16:19"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/da9b065cedfd3b574f229d5be594e6aa47a27ae6","name":"https://git.kernel.org/stable/c/da9b065cedfd3b574f229d5be594e6aa47a27ae6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8de779dc40d35d39fa07387b6f921eb11df0f511","name":"https://git.kernel.org/stable/c/8de779dc40d35d39fa07387b6f921eb11df0f511","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4f312c30f0368e8d2a76aa650dff73f23490b5e7","name":"https://git.kernel.org/stable/c/4f312c30f0368e8d2a76aa650dff73f23490b5e7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/18dd358de72d57993422cbb5dfb29ccd74efe192","name":"https://git.kernel.org/stable/c/18dd358de72d57993422cbb5dfb29ccd74efe192","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a2c53a3822ee26e8d758071815b9ed3bf6669fc1","name":"https://git.kernel.org/stable/c/a2c53a3822ee26e8d758071815b9ed3bf6669fc1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43497","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43497","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7433914efd584b22bb49d3e1eee001f5d0525ecd 4f312c30f0368e8d2a76aa650dff73f23490b5e7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7433914efd584b22bb49d3e1eee001f5d0525ecd 18dd358de72d57993422cbb5dfb29ccd74efe192 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7433914efd584b22bb49d3e1eee001f5d0525ecd da9b065cedfd3b574f229d5be594e6aa47a27ae6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7433914efd584b22bb49d3e1eee001f5d0525ecd a2c53a3822ee26e8d758071815b9ed3bf6669fc1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7433914efd584b22bb49d3e1eee001f5d0525ecd 8de779dc40d35d39fa07387b6f921eb11df0f511 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.140 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.88 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.30 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.7 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"43497","cve":"CVE-2026-43497","epss":"0.000240000","percentile":"0.070660000","score_date":"2026-05-28","updated_at":"2026-05-29 00:13:16"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/video/fbdev/udlfb.c","include/video/udlfb.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"4f312c30f0368e8d2a76aa650dff73f23490b5e7","status":"affected","version":"7433914efd584b22bb49d3e1eee001f5d0525ecd","versionType":"git"},{"lessThan":"18dd358de72d57993422cbb5dfb29ccd74efe192","status":"affected","version":"7433914efd584b22bb49d3e1eee001f5d0525ecd","versionType":"git"},{"lessThan":"da9b065cedfd3b574f229d5be594e6aa47a27ae6","status":"affected","version":"7433914efd584b22bb49d3e1eee001f5d0525ecd","versionType":"git"},{"lessThan":"a2c53a3822ee26e8d758071815b9ed3bf6669fc1","status":"affected","version":"7433914efd584b22bb49d3e1eee001f5d0525ecd","versionType":"git"},{"lessThan":"8de779dc40d35d39fa07387b6f921eb11df0f511","status":"affected","version":"7433914efd584b22bb49d3e1eee001f5d0525ecd","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/video/fbdev/udlfb.c","include/video/udlfb.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.19"},{"lessThan":"4.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.140","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.88","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.30","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.140","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.88","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.30","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.7","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc3","versionStartIncluding":"4.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-05-22T07:32:48.345Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/4f312c30f0368e8d2a76aa650dff73f23490b5e7"},{"url":"https://git.kernel.org/stable/c/18dd358de72d57993422cbb5dfb29ccd74efe192"},{"url":"https://git.kernel.org/stable/c/da9b065cedfd3b574f229d5be594e6aa47a27ae6"},{"url":"https://git.kernel.org/stable/c/a2c53a3822ee26e8d758071815b9ed3bf6669fc1"},{"url":"https://git.kernel.org/stable/c/8de779dc40d35d39fa07387b6f921eb11df0f511"}],"title":"fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43497","datePublished":"2026-05-21T12:12:47.150Z","dateReserved":"2026-05-01T14:12:56.013Z","dateUpdated":"2026-05-22T07:32:48.345Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-21 13:16:19","lastModifiedDate":"2026-05-21 13:16:19","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43497","Ordinal":"1","Title":"fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-f","CVE":"CVE-2026-43497","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43497","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-f"}]}}}