{"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":"2026-06-01T16:16:01.191Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-06-01T16:16:01.191Z"},"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"}}],"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":"18dd358de72d57993422cbb5dfb29ccd74efe192","status":"affected","versionType":"git"},{"version":"7433914efd584b22bb49d3e1eee001f5d0525ecd","lessThan":"da9b065cedfd3b574f229d5be594e6aa47a27ae6","status":"affected","versionType":"git"},{"version":"7433914efd584b22bb49d3e1eee001f5d0525ecd","lessThan":"a2c53a3822ee26e8d758071815b9ed3bf6669fc1","status":"affected","versionType":"git"},{"version":"7433914efd584b22bb49d3e1eee001f5d0525ecd","lessThan":"8de779dc40d35d39fa07387b6f921eb11df0f511","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/video/fbdev/udlfb.c","include/video/udlfb.h"],"versions":[{"version":"4.19","status":"affected"},{"version":"0","lessThan":"4.19","status":"unaffected","versionType":"semver"},{"version":"5.10.258","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.209","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.175","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.140","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.88","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.30","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.7","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1-rc3","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":"4.19","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.12.88"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.18.30"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.0.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.1-rc3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/60f711cfd580f86fea8284146ac133804e728f9a"},{"url":"https://git.kernel.org/stable/c/5931f5651ee32bd41b3323256b31fcc8e71336ed"},{"url":"https://git.kernel.org/stable/c/e3d9865dacd7435b8465848428210d0f0c673311"},{"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"}}}}