{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89885","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.773Z","datePublished":"2026-09-16T10:31:49.746Z","dateUpdated":"2026-09-16T14:39:35.735Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-16T14:39:35.735Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: platform: mtk-mdp3: Fix SCP device refcounting\n\nmdp_probe() first tries to get the SCP handle with scp_get(). When that\nfails, it falls back to looking up the SCP platform device with\n__get_pdev_by_id() and then reads its driver data.\n\nThe fallback lookup returns the platform device with a reference, just\nlike scp_get() does. However, the fallback path currently drops that\nreference immediately after platform_get_drvdata(). The driver later\nstill calls scp_put(mdp->scp) unconditionally from the probe error path\nand from mdp_video_device_release(), which drops the SCP device\nreference again.\n\nKeep the fallback reference until the existing scp_put() call, so that\nthe fallback path follows the same ownership rules as the scp_get()\npath."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The extra put_device is in mdp_probe()/mdp_video_device_release of the MediaTek MDP3 platform driver, reached only via local driver-model bind on MT8183/MT8195 (boot, deferred probe, module load, or sysfs rebind). No network, Bluetooth/Wi-Fi, or USB path reaches this SCP refcounting.\nAC:L - On MT8183 the MDP RDMA node has no mediatek,scp phandle, so scp_get() fails and the compatible fallback is the production path. That path drops the of_find_device_by_node() ref then later scp_put() extra-puts; cmdq mailbox EPROBE_DEFER after the fallback makes this deterministic with no race.\nPR:N - mdp_probe() runs in driver-core context with no capable() or credential check. On MediaTek Chromebooks, phones, and embedded boards, MDP3 commonly deferred-probes at boot after the SCP fallback, so the extra put fires without a user account.\nUI:N - Platform probe and deferred-probe retries run unattended at boot or module bind on affected hardware. Opening /dev/video, mounting a filesystem, or plugging a device is not required.\nS:U - The extra put_device() use-after-free is of the host SCP platform_device inside the same kernel security authority. It does not cross a VM, IOMMU/DMA, or sandbox boundary.\nC:H - scp_put() extra-puts the SCP platform_device, which can run device_release and free the still-bound struct device. A use-after-free of that object enables reclaim and kernel-memory disclosure.\nI:H - The same device UAF is heap corruption of struct platform_device/mtk_scp still used by the SCP driver and other scp_get() holders, enabling heap spray, arbitrary write, and control-flow hijack.\nA:H - Freeing the SCP device while it remains registered, or later dereferencing the dangling scp pointer from MDP3/vcodec, causes a kernel oops or panic."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c"],"versions":[{"version":"db4d27e6bbbf511f9cdb33f682535a0a3cb7c403","lessThan":"dce13bd9bade3ecc1acb7579397f24743850997f","status":"affected","versionType":"git"},{"version":"31ba1a4d7a5d9466f6ef4910a372b8200f8aad19","lessThan":"252850653569fdb1a259937e02325cf32c8f0970","status":"affected","versionType":"git"},{"version":"8f6f3aa21517ef34d50808af0c572e69580dca20","lessThan":"0259ade4c4ceaf1e184a7c1aea8071ad398f9b6f","status":"affected","versionType":"git"},{"version":"8f6f3aa21517ef34d50808af0c572e69580dca20","lessThan":"55793e4665b7f15151e6f5ab51ca980e73abed5d","status":"affected","versionType":"git"},{"version":"6.12.64","lessThan":"6.12.110","status":"affected","versionType":"semver"},{"version":"6.18.4","lessThan":"6.18.51","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c"],"versions":[{"version":"6.19","status":"affected"},{"version":"0","lessThan":"6.19","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.51","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.5","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","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":"6.12.64","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.4","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.3-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/dce13bd9bade3ecc1acb7579397f24743850997f"},{"url":"https://git.kernel.org/stable/c/252850653569fdb1a259937e02325cf32c8f0970"},{"url":"https://git.kernel.org/stable/c/0259ade4c4ceaf1e184a7c1aea8071ad398f9b6f"},{"url":"https://git.kernel.org/stable/c/55793e4665b7f15151e6f5ab51ca980e73abed5d"}],"title":"media: platform: mtk-mdp3: Fix SCP device refcounting","x_generator":{"engine":"bippy-1.2.0"}}}}