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CVE-2025-21956— drm/amd/display: Assign normalized_pix_clk when color depth = 14

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，该漏洞源于未处理14位色深情况导致显示时钟计算异常。

AI Predicted 5.0 Difficulty: Trivial EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c< cca3ab74f90176099b6392e8e894b52b27b3d080 affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c< 0174a2e5770efee9dbd4b58963ed4d939298ff5e affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c< 0c0016712e5dc23ce4a7e673cbebc24a535d8c8a affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c< dc831b38680c47d07e425871a9852109183895cf affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c< a8f77e1658d78e4a8bb227a83bcee67de97f7634 affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c< 04f90b505ad3a6eed474bbaa03167095fef5203a affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c< 27df30106690969f7d63604f0d49ed8e9bffa2cb affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c< 79e31396fdd7037c503e6add15af7cb00633ea92 affected
… +10 more rows
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I. Basic Information for CVE-2025-21956

Vulnerability Information
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Vulnerability Title
drm/amd/display: Assign normalized_pix_clk when color depth = 14
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Assign normalized_pix_clk when color depth = 14 [WHY & HOW] A warning message "WARNING: CPU: 4 PID: 459 at ... /dc_resource.c:3397 calculate_phy_pix_clks+0xef/0x100 [amdgpu]" occurs because the display_color_depth == COLOR_DEPTH_141414 is not handled. This is observed in Radeon RX 6600 XT. It is fixed by assigning pix_clk * (14 * 3) / 24 - same as the rests. Also fixes the indentation in get_norm_pix_clk. (cherry picked from commit 274a87eb389f58eddcbc5659ab0b180b37e92775)
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，该漏洞源于未处理14位色深情况导致显示时钟计算异常。
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 ~ cca3ab74f90176099b6392e8e894b52b27b3d080 -
Linux Linux 4.15 -

II. Public POCs for CVE-2025-21956

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III. Intelligence Information for CVE-2025-21956

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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-2025-21896 7.8 HIGH fuse: revert back to __readahead_folio() for readahead
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-2025-21926 7.8 HIGH net: gso: fix ownership in __udp_gso_segment
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 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21956

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