In the Linux kernel, the following vulnerability has been resolved:
l2tp: pass correct message length to ip6_append_data
l2tp_ip6_sendmsg needs to avoid accounting for the transport header
twice when splicing more data into an already partially-occupied skbuff.
To manage this, we check whether the skbuff contains data using
skb_queue_empty when deciding how much data to append using
ip6_append_data.
However, the code which performed the calculation was incorrect:
ulen = len + skb_queue_empty(&sk->sk_write_queue) ? transhdrlen : 0;
...due to C operator precedence, this ends up setting ulen to
transhdrlen for messages with a non-zero length, which results in
corrupted packets on the wire.
Add parentheses to correct the calculation in line with the original
intent.
References
Configurations
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History
No history.
Information
Published : 2024-04-03 17:15
Updated : 2025-03-17 16:57
NVD link : CVE-2024-26752
Mitre link : CVE-2024-26752
CVE.ORG link : CVE-2024-26752
JSON object : View
Products Affected
linux
- linux_kernel
debian
- debian_linux
CWE
CWE-131
Incorrect Calculation of Buffer Size