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CVE-2025-38240— drm/mediatek: dp: drm_err => dev_err in HPD path to avoid NULL ptr

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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于HPD路径使用drm_err而非dev_err，可能导致空指针取消引用。

AI Predicted 5.5 Difficulty: Easy EPSS 0.26% · P17

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 7eacba9a083be65c0f251c19380ec01147c01ebc< 13ec849fd2eab808ee8eba2625df7ebea3b85edf affected
7eacba9a083be65c0f251c19380ec01147c01ebc< 57a9fb47551b33cde7b76d17c0072c3b394f4620 affected
7eacba9a083be65c0f251c19380ec01147c01ebc< 2fda391ef7a701748abd7fa32232981b522c1e07 affected
7eacba9a083be65c0f251c19380ec01147c01ebc< 149a5c38436c229950cf1020992ce65c9549bc19 affected
7eacba9a083be65c0f251c19380ec01147c01ebc< 106a6de46cf4887d535018185ec528ce822d6d84 affected
6.6 affected
< 6.6 unaffected
6.6.87≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-38240

Vulnerability Information
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Vulnerability Title
drm/mediatek: dp: drm_err => dev_err in HPD path to avoid NULL ptr
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: dp: drm_err => dev_err in HPD path to avoid NULL ptr The function mtk_dp_wait_hpd_asserted() may be called before the `mtk_dp->drm_dev` pointer is assigned in mtk_dp_bridge_attach(). Specifically it can be called via this callpath: - mtk_edp_wait_hpd_asserted - [panel probe] - dp_aux_ep_probe Using "drm" level prints anywhere in this callpath causes a NULL pointer dereference. Change the error message directly in mtk_dp_wait_hpd_asserted() to dev_err() to avoid this. Also change the error messages in mtk_dp_parse_capabilities(), which is called by mtk_dp_wait_hpd_asserted(). While touching these prints, also add the error code to them to make future debugging easier.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于HPD路径使用drm_err而非dev_err，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 7eacba9a083be65c0f251c19380ec01147c01ebc ~ 13ec849fd2eab808ee8eba2625df7ebea3b85edf -
Linux Linux 6.6 -

II. Public POCs for CVE-2025-38240

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III. Intelligence Information for CVE-2025-38240

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Other References for CVE-2025-38240 (4)

Same Patch Batch · Linux · 2025-04-18 · 23 CVEs total

CVE-2025-39930 8.4 HIGH ASoC: simple-card-utils: Don't use __free(device_node) at graph_util_parse_dai()
CVE-2025-40364 7.8 HIGH io_uring: fix io_req_prep_async with provided buffers
CVE-2025-37785 7.8 HIGH ext4: fix OOB read when checking dotdot dir
CVE-2025-37893 7.8 HIGH LoongArch: BPF: Fix off-by-one error in build_prologue()
CVE-2025-37838 7.8 HIGH HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Con
CVE-2025-39688 7.5 HIGH nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()
CVE-2025-39735 7.1 HIGH jfs: fix slab-out-of-bounds read in ea_get()
CVE-2025-38575 ksmbd: use aead_request_free to match aead_request_alloc
CVE-2025-37860 sfc: fix NULL dereferences in ef100_process_design_param()
CVE-2025-37925 jfs: reject on-disk inodes of an unsupported type
CVE-2025-40325 md/raid10: wait barrier before returning discard request with REQ_NOWAIT
CVE-2025-38049 x86/resctrl: Fix allocation of cleanest CLOSID on platforms with no monitors
CVE-2025-38104 drm/amdgpu: Replace Mutex with Spinlock for RLCG register access to avoid Priority Inversi
CVE-2025-38152 remoteproc: core: Clear table_sz when rproc_shutdown
CVE-2025-38479 dmaengine: fsl-edma: free irq correctly in remove path
CVE-2025-40014 objtool, spi: amd: Fix out-of-bounds stack access in amd_set_spi_freq()
CVE-2025-38637 net_sched: skbprio: Remove overly strict queue assertions
CVE-2025-39728 clk: samsung: Fix UBSAN panic in samsung_clk_init()
CVE-2025-39755 staging: gpib: Fix cb7210 pcmcia Oops
CVE-2025-39778 objtool, nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state_show()

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38240

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