PT-2026-61281 · Linux · Linux

CVE-2026-63964

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Publicado

2026-07-19

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Atualizado

2026-07-19

Nenhuma

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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.
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Identificadores relacionados

CVE-2026-63964

Produtos afetados

Linux