CVE-2025-40301

Name	CVE-2025-40301
Description	In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: validate skb length for unknown CC opcode In hci_cmd_complete_evt(), if the command complete event has an unknown opcode, we assume the first byte of the remaining skb->data contains the return status. However, parameter data has previously been pulled in hci_event_func(), which may leave the skb empty. If so, using skb->data[0] for the return status uses un-init memory. The fix is to check skb->len before using skb->data.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bullseye	5.10.223-1	fixed
	bullseye (security)	5.10.247-1	fixed
	bookworm	6.1.148-1	vulnerable
	bookworm (security)	6.1.158-1	vulnerable
	trixie	6.12.57-1	vulnerable
	trixie (security)	6.12.48-1	vulnerable
	forky	6.17.9-1	fixed
	sid	6.17.11-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
linux	source	bullseye	(not affected)
linux	source	(unstable)	6.17.8-1

[bullseye] - linux <not-affected> (Vulnerable code not present)
https://git.kernel.org/linus/5c5f1f64681cc889d9b13e4a61285e9e029d6ab5 (6.18-rc5)