CVE-2024-41091

tun: add missing verification for short frame

State: Published
Severity: 8.8 High
Published: Jul 29, 2024
Updated: Aug 5, 2026
Reserved: Jul 12, 2024

Description

In the Linux kernel, the following vulnerability has been resolved:

tun: add missing verification for short frame

The cited commit missed to check against the validity of the frame length in the tun_xdp_one() path, which could cause a corrupted skb to be sent downstack. Even before the skb is transmitted, the tun_xdp_one-->eth_type_trans() may access the Ethernet header although it can be less than ETH_HLEN. Once transmitted, this could either cause out-of-bound access beyond the actual length, or confuse the underlayer with incorrect or inconsistent header length in the skb metadata.

In the alternative path, tun_get_user() already prohibits short frame which has the length less than Ethernet header size from being transmitted for IFF_TAP.

This is to drop any frame shorter than the Ethernet header size just like how tun_get_user() does.

CVE: CVE-2024-41091

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	043d222f93ab8c76b56a3b315cd8692e35affb6c to before 32b0aaba5dbc85816898167d9b5d45a22eae82e9Affected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before 6100e0237204890269e3f934acfc50d35fd6f319Affected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before 589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2Affected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146Affected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before d5ad89b7d01ed4e66fd04734fc63d6e78536692aAffected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before a9d1c27e2ee3b0ea5d40c105d6e728fc114470bbAffected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before 8418f55302fa1d2eeb73e16e345167e545c598a5Affected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before 049584807f1d797fc3078b68035450a9769eb5c3Affected
LinuxLinux	4.20Affected before 4.20Not affected 5.4.281 through 5.4.Not affected 5.10.223 through 5.10.Not affected 5.15.164 through 5.15.Not affected 6.1.102 through 6.1.Not affected 6.6.43 through 6.6.Not affected 6.9.12 through 6.9.Not affected 6.10.2 through 6.10.*Not affected 6.11 and laterNot affected

Product

Versions

LinuxLinux

043d222f93ab8c76b56a3b315cd8692e35affb6c to before 32b0aaba5dbc85816898167d9b5d45a22eae82e9Affected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before 6100e0237204890269e3f934acfc50d35fd6f319Affected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before 589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2Affected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146Affected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before d5ad89b7d01ed4e66fd04734fc63d6e78536692aAffected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before a9d1c27e2ee3b0ea5d40c105d6e728fc114470bbAffected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before 8418f55302fa1d2eeb73e16e345167e545c598a5Affected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before 049584807f1d797fc3078b68035450a9769eb5c3Affected

LinuxLinux

4.20Affected
before 4.20Not affected
5.4.281 through 5.4.*Not affected
5.10.223 through 5.10.*Not affected
5.15.164 through 5.15.*Not affected
6.1.102 through 6.1.*Not affected
6.6.43 through 6.6.*Not affected
6.9.12 through 6.9.*Not affected
6.10.2 through 6.10.*Not affected
6.11 and laterNot affected

References

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