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CVE-2024-41091

Disclosure Date: July 29, 2024 •
CVE-2024-41091
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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

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CVSS V3 Severity and Metrics
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General Information

Offensive Application
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Utility Class
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OS
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Vulnerable Versions
Linux 32b0aaba5dbc
Linux not down converted
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Metasploit Module
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Vendors

  • Linux

Products

  • Linux
Technical Analysis