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CVE-2026-63961— usb: typec: altmodes/displayport: validate count before reading Status Update VDO

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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于未对状态更新VDO中的计数进行验证，可能导致读取未初始化堆栈数据并发送出去。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.22% · P12

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588< 74aabe9ea30fdfba924fce9594e6aa69a596a4bb affected
0e3bb7d6894d9b6e67d6382bb03a46a1dc989588< dd7118c010f324497c275e8fd7a35c9baaa2a00f affected
0e3bb7d6894d9b6e67d6382bb03a46a1dc989588< 6ffdbcd7a02f3af8fff9b6519830369f574ed44c affected
0e3bb7d6894d9b6e67d6382bb03a46a1dc989588< 70e7045849e954e56dcbf441b6330e66bc996306 affected
0e3bb7d6894d9b6e67d6382bb03a46a1dc989588< 64bd6ccc5799f8473d1f37d4d8f53093dfec5c02 affected
0e3bb7d6894d9b6e67d6382bb03a46a1dc989588< b10eff5abe6aa2a5af10ed17bddff76e3b6e6b9b affected
0e3bb7d6894d9b6e67d6382bb03a46a1dc989588< 77a759ec30bc5fb0dd9c867b711d0acfed6c7faa affected
0e3bb7d6894d9b6e67d6382bb03a46a1dc989588< 8a18f896e667df491331371b55d4ad644dc51d60 affected
… +10 more rows
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I. Basic Information for CVE-2026-63961

Vulnerability Information
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Vulnerability Title
usb: typec: altmodes/displayport: validate count before reading Status Update VDO
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: typec: altmodes/displayport: validate count before reading Status Update VDO A broken/malicious device can send the incorrect count for a status update VDO, which will cause the kernel to read uninitialized stack data and send it off elsewhere. Fix this up by correctly verifying the count for the update object.
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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于未对状态更新VDO中的计数进行验证，可能导致读取未初始化堆栈数据并发送出去。
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 0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 ~ 74aabe9ea30fdfba924fce9594e6aa69a596a4bb -
Linux Linux 4.19 -

II. Public POCs for CVE-2026-63961

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III. Intelligence Information for CVE-2026-63961

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Patches & Fixes for CVE-2026-63961 (5)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-63993 9.8 CRITICAL vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
CVE-2026-63994 9.8 CRITICAL tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-64000 9.8 CRITICAL net: hsr: fix potential OOB access in supervision frame handling
CVE-2026-64046 9.8 CRITICAL net: tls: prevent chain-after-chain in plain text SG
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64007 9.8 CRITICAL netfilter: synproxy: refresh tcphdr after skb_ensure_writable
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-64016 9.8 CRITICAL ksmbd: fix durable reconnect error path file lifetime
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63961

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