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CVE-2025-21985— drm/amd/display: Fix out-of-bound accesses

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drm amd display模块存在越界访问。

CVSS 7.8 · High EPSS 0.20% · P9 Updated Aug 05, 2026

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 8

Vendor	Product	Version Range	Status
Linux	Linux	`4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c< 36793d90d76f667d26c6dd025571481ee0c96abc`	affected
		`4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c< 9aedc776b11038f04f4641241bb7e877781e4aa4`	affected
		`4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c< 8adbb2a98b00926315fd513b5fe2596b5716b82d`	affected
		`4.15`	affected
		`< 4.15`	unaffected
		`6.12.20≤ 6.12.*`	unaffected
		`6.13.8≤ 6.13.*`	unaffected
		`6.14≤ *`	unaffected

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I. Basic Information for CVE-2025-21985

Vulnerability Information

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Vulnerability Title

drm/amd/display: Fix out-of-bound accesses

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix out-of-bound accesses [WHAT & HOW] hpo_stream_to_link_encoder_mapping has size MAX_HPO_DP2_ENCODERS(=4), but location can have size up to 6. As a result, it is necessary to check location against MAX_HPO_DP2_ENCODERS. Similiarly, disp_cfg_stream_location can be used as an array index which should be 0..5, so the ASSERT's conditions should be less without equal.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/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

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drm amd display模块存在越界访问。

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	4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c ~ 36793d90d76f667d26c6dd025571481ee0c96abc	-
Linux	Linux	4.15	-

II. Public POCs for CVE-2025-21985

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2025-21985

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Patches & Fixes for CVE-2025-21985 (1)

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https://www.cve.org/CVERecord?id=CVE-2025-21985

Same Patch Batch · Linux · 2025-04-01 · 93 CVEs total

CVE-2025-21954	9.8 CRITICAL	netmem: prevent TX of unreadable skbs
CVE-2025-21927	9.8 CRITICAL	nvme-tcp: fix potential memory corruption in nvme_tcp_recv_pdu()
CVE-2025-21955	8.8 HIGH	ksmbd: prevent connection release during oplock break notification
CVE-2025-21946	8.8 HIGH	ksmbd: fix out-of-bounds in parse_sec_desc()
CVE-2025-21945	8.8 HIGH	ksmbd: fix use-after-free in smb2_lock
CVE-2025-21969	8.8 HIGH	Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd
CVE-2025-21967	8.8 HIGH	ksmbd: fix use-after-free in ksmbd_free_work_struct
CVE-2025-21972	8.8 HIGH	net: mctp: unshare packets when reassembling
CVE-2025-21947	8.1 HIGH	ksmbd: fix type confusion via race condition when using ipc_msg_send_request
CVE-2025-21926	7.8 HIGH	net: gso: fix ownership in __udp_gso_segment
CVE-2025-21971	7.8 HIGH	net_sched: Prevent creation of classes with TC_H_ROOT
CVE-2025-21899	7.8 HIGH	tracing: Fix bad hist from corrupting named_triggers list
CVE-2025-21979	7.8 HIGH	wifi: cfg80211: cancel wiphy_work before freeing wiphy
CVE-2025-21901	7.8 HIGH	RDMA/bnxt_re: Add sanity checks on rdev validity
CVE-2025-21966	7.8 HIGH	dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature
CVE-2025-21965	7.8 HIGH	sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()
CVE-2025-21934	7.8 HIGH	rapidio: fix an API misues when rio_add_net() fails
CVE-2025-21939	7.8 HIGH	drm/xe/hmm: Don't dereference struct page pointers without notifier lock
CVE-2025-21958	7.8 HIGH	Revert "openvswitch: switch to per-action label counting in conntrack"
CVE-2025-21949	7.8 HIGH	LoongArch: Set hugetlb mmap base address aligned with pmd size

Showing top 20 of 93 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux