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.
References
Configurations
Configuration 1 (hide)
|
History
30 Oct 2026, 17:29
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-476 | |
| First Time |
Linux linux Kernel
Linux |
|
| CPE | cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/2f395ca1263bd181995eb829f5943a83a20db213 - Patch | |
| References | () https://git.kernel.org/stable/c/3f432b8203066c26770fe6ea591361f10021dd6b - Patch | |
| References | () https://git.kernel.org/stable/c/6526f8684f72391138353642af908803ba70795e - Patch | |
| References | () https://git.kernel.org/stable/c/a38ed87818b2419090fb1a6338ddce6842b65dfa - Patch | |
| References | () https://git.kernel.org/stable/c/b41dfc033fe594e152648050e95b9489cd53e9e3 - Patch | |
| References | () https://git.kernel.org/stable/c/c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb - Patch | |
| References | () https://git.kernel.org/stable/c/c8460de584fe5415d212cfdd127d4db90835a450 - Patch | |
| References | () https://git.kernel.org/stable/c/d7486952bf74e546ee3748fb14b2d07881fa6273 - Patch | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
Information
Published : 2026-07-19 16:17
Updated : 2026-10-30 17:29
NVD link : CVE-2026-63964
Mitre link : CVE-2026-63964
CVE.ORG link : CVE-2026-63964
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference