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CVE-2026-63964— usb: typec: ucsi: ccg: reject firmware images without a ':' record header

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USB Type-C UCSI CCG固件在处理不带冒号记录头的镜像文件时缺少对strnchr()返回值的检查，可能导致空指针取消引用，从而触发内核崩溃。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.22% · P12

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 5c9ae5a87573d38cfc4c740aafda2fa6ce06e401< b41dfc033fe594e152648050e95b9489cd53e9e3 affected
5c9ae5a87573d38cfc4c740aafda2fa6ce06e401< 2f395ca1263bd181995eb829f5943a83a20db213 affected
5c9ae5a87573d38cfc4c740aafda2fa6ce06e401< 6526f8684f72391138353642af908803ba70795e affected
5c9ae5a87573d38cfc4c740aafda2fa6ce06e401< 3f432b8203066c26770fe6ea591361f10021dd6b affected
5c9ae5a87573d38cfc4c740aafda2fa6ce06e401< c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb affected
5c9ae5a87573d38cfc4c740aafda2fa6ce06e401< a38ed87818b2419090fb1a6338ddce6842b65dfa affected
5c9ae5a87573d38cfc4c740aafda2fa6ce06e401< c8460de584fe5415d212cfdd127d4db90835a450 affected
5c9ae5a87573d38cfc4c740aafda2fa6ce06e401< d7486952bf74e546ee3748fb14b2d07881fa6273 affected
… +10 more rows
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I. Basic Information for CVE-2026-63964

Vulnerability Information
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Vulnerability Title
usb: typec: ucsi: ccg: reject firmware images without a ':' record header
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: ccg: reject firmware images without a ':' record header do_flash() locates the first .cyacd record with p = strnchr(fw->data, fw->size, ':'); while (p < eof) { s = strnchr(p + 1, eof - p - 1, ':'); ... } If the firmware image contains no ':' byte, strnchr() returns NULL. NULL compares less than the valid kernel pointer eof, so the loop body runs and strnchr() is called with p + 1 == (void *)1 and a length of roughly (unsigned long)eof, causing a wonderful crash. The not_signed_fw fallthrough earlier in do_flash() and the chip-state branches in ccg_fw_update_needed() allow an unsigned blob to reach this loop, so a root user who can place a crafted file under /lib/firmware and write the do_flash sysfs attribute can trigger the oops. Bail out with -EINVAL when the initial strnchr() returns NULL.
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USB Type-C UCSI CCG固件在处理不带冒号记录头的镜像文件时缺少对strnchr()返回值的检查，可能导致空指针取消引用，从而触发内核崩溃。
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 5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 ~ b41dfc033fe594e152648050e95b9489cd53e9e3 -
Linux Linux 5.2 -

II. Public POCs for CVE-2026-63964

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III. Intelligence Information for CVE-2026-63964

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Patches & Fixes for CVE-2026-63964 (7)

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-2026-63964

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