{"id":"CVE-2026-64050","state":"PUBLISHED","title":"drm/msm/dpu: don't mix devm and drmm functions","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm/dpu: don't mix devm and drmm functions\n\nMixing devm and drmm functions will result in a use-after-free on msm\ndriver teardown if userspace keeps a reference on the drm device:\nThe WB connector data will be destroyed because of the use of\ndevm_kzalloc()), while the usersoace still can try interacting with the\nWB connector (which uses drmm_ functions).\n\nChange dpu_writeback_init() to use drmm_.\n\nPatchwork: https://patchwork.freedesktop.org/patch/722656/","publishedAt":"2026-07-19T15:39:33.942Z","updatedAt":"2026-08-05T12:38:41.459Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b","status":"affected","lessThan":"ff58e5ef1b46ce614af048d2d04986df05ffab90","versionType":"git"},{"version":"0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b","status":"affected","lessThan":"95048a12f48c627bc2ccc4d84f87640630ba2bdb","versionType":"git"},{"version":"0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b","status":"affected","lessThan":"c0c70a11365cba7fba25a77463582bcec0f7846e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c"]}],"references":["https://git.kernel.org/stable/c/ff58e5ef1b46ce614af048d2d04986df05ffab90","https://git.kernel.org/stable/c/95048a12f48c627bc2ccc4d84f87640630ba2bdb","https://git.kernel.org/stable/c/c0c70a11365cba7fba25a77463582bcec0f7846e"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64050.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64050","state":"PUBLISHED","datePublished":"2026-07-19T15:39:33.942Z","dateUpdated":"2026-08-05T12:38:41.459Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.029Z"},"containers":{"cna":{"title":"drm/msm/dpu: don't mix devm and drmm functions","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm/dpu: don't mix devm and drmm functions\n\nMixing devm and drmm functions will result in a use-after-free on msm\ndriver teardown if userspace keeps a reference on the drm device:\nThe WB connector data will be destroyed because of the use of\ndevm_kzalloc()), while the usersoace still can try interacting with the\nWB connector (which uses drmm_ functions).\n\nChange dpu_writeback_init() to use drmm_.\n\nPatchwork: https://patchwork.freedesktop.org/patch/722656/"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b","status":"affected","lessThan":"ff58e5ef1b46ce614af048d2d04986df05ffab90","versionType":"git"},{"version":"0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b","status":"affected","lessThan":"95048a12f48c627bc2ccc4d84f87640630ba2bdb","versionType":"git"},{"version":"0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b","status":"affected","lessThan":"c0c70a11365cba7fba25a77463582bcec0f7846e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ff58e5ef1b46ce614af048d2d04986df05ffab90"},{"url":"https://git.kernel.org/stable/c/95048a12f48c627bc2ccc4d84f87640630ba2bdb"},{"url":"https://git.kernel.org/stable/c/c0c70a11365cba7fba25a77463582bcec0f7846e"}],"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 bug is reachable only through local DRM character device ioctls on /dev/dri/card0 during driver teardown, not via any network protocol or physical bus.\nAC:L - An attacker who keeps a DRM file descriptor open controls the userspace side of the race and can repeatedly issue ioctls during the teardown window; UAF exploitation does not depend on winning a race the attacker cannot influence.\nPR:L - Exploitation requires only local access to the primary DRM device node (typically membership in the video/render group on Linux); no real root or init-namespace capabilities are needed to hold the fd and trigger UAF via connector query ioctls.\nUI:N - No victim interaction is required beyond the attacker maintaining their own open DRM file descriptor during driver unload or unbind.\nS:U - The vulnerability causes kernel memory corruption and potential local privilege escalation within the same kernel security boundary, not a cross-boundary escape such as VM or IOMMU bypass.\nC:H - Use-after-free of the dpu_wb_connector structure allows reading freed slab memory and can be leveraged for arbitrary kernel memory disclosure through heap grooming.\nI:H - UAF corruption of connector private data and the wb_enc pointer can be turned into arbitrary kernel writes or code execution, and the writeback path can program display hardware DMA to attacker-influenced addresses.\nA:H - Dereferencing the freed dpu_wb_connector during ioctl handling can cause kernel oops or panic, and UAF exploitation attempts reliably threaten system availability."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:38:41.459Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}