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CVE-2026-89885— media: platform: mtk-mdp3: Fix SCP device refcounting

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已解决以下漏洞： media: platform: mtk-mdp3: 修复 SCP 设备引用计数问题 在 函数中，首先尝试通过 获取 SCP 句柄。如果该调用失败，代码会回退到使用 查找 SCP 平台设备，并读取其驱动数据。 回退路径中的查找操作返回带有引用的平台设备，这与 的行为一致。然而，当前的回退路径在调用 之后立即丢弃了该引用。而驱动程序随后会在探针错误路径以及 中无条件地调用 ，这会再次释放 SCP 设备引用，导致引用计数不匹配。 修复方法：保留回退路径中的引用，直到现有的 调用

CVSS 8.4 · High EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux db4d27e6bbbf511f9cdb33f682535a0a3cb7c403< dce13bd9bade3ecc1acb7579397f24743850997f affected
31ba1a4d7a5d9466f6ef4910a372b8200f8aad19< 252850653569fdb1a259937e02325cf32c8f0970 affected
8f6f3aa21517ef34d50808af0c572e69580dca20< 0259ade4c4ceaf1e184a7c1aea8071ad398f9b6f affected
8f6f3aa21517ef34d50808af0c572e69580dca20< 55793e4665b7f15151e6f5ab51ca980e73abed5d affected
6.12.64< 6.12.110 affected
6.18.4< 6.18.51 affected
6.19 affected
< 6.19 unaffected
… +4 more rows
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I. Basic Information for CVE-2026-89885

Vulnerability Information
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Vulnerability Title
media: platform: mtk-mdp3: Fix SCP device refcounting
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: media: platform: mtk-mdp3: Fix SCP device refcounting mdp_probe() first tries to get the SCP handle with scp_get(). When that fails, it falls back to looking up the SCP platform device with __get_pdev_by_id() and then reads its driver data. The fallback lookup returns the platform device with a reference, just like scp_get() does. However, the fallback path currently drops that reference immediately after platform_get_drvdata(). The driver later still calls scp_put(mdp->scp) unconditionally from the probe error path and from mdp_video_device_release(), which drops the SCP device reference again. Keep the fallback reference until the existing scp_put() call, so that the fallback path follows the same ownership rules as the scp_get() path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux db4d27e6bbbf511f9cdb33f682535a0a3cb7c403 ~ dce13bd9bade3ecc1acb7579397f24743850997f -
Linux Linux 6.19 -

II. Public POCs for CVE-2026-89885

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III. Intelligence Information for CVE-2026-89885

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Other References for CVE-2026-89885 (2)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89930 9.3 CRITICAL KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89885

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