UBUNTU-CVE-2024-26752
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.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
29 explicit affected versions
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10 explicit affected versions
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13 explicit affected versions
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4 explicit affected versions
29 explicit affected versions
80 explicit affected versions
13 explicit affected versions
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91 explicit affected versions
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33 explicit affected versions
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11 explicit affected versions
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30 explicit affected versions
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10 explicit affected versions
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25 explicit affected versions
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13 explicit affected versions
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78 explicit affected versions
44 explicit affected versions
16 explicit affected versions
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13 explicit affected versions
26 explicit affected versions
35 explicit affected versions
37 explicit affected versions
14 explicit affected versions
38 explicit affected versions
167 explicit affected versions
39 explicit affected versions
9 explicit affected versions
38 explicit affected versions
11 explicit affected versions
46 explicit affected versions
8 explicit affected versions
7 explicit affected versions
20 explicit affected versions
97 explicit affected versions
50 explicit affected versions
121 explicit affected versions
4 explicit affected versions
44 explicit affected versions
13 explicit affected versions
43 explicit affected versions
44 explicit affected versions
10 explicit affected versions
8 explicit affected versions
14 explicit affected versions
79 explicit affected versions
4 explicit affected versions
68 explicit affected versions
11 explicit affected versions
1 explicit affected versions
69 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79
- https://git.kernel.org/stable/c/0da15a70395182ee8cb75716baf00dddc0bea38d
- https://git.kernel.org/stable/c/13cd1daeea848614e585b2c6ecc11ca9c8ab2500
- https://git.kernel.org/stable/c/359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79
- https://git.kernel.org/stable/c/4c3ce64bc9d36ca9164dd6c77ff144c121011aae
- https://git.kernel.org/stable/c/804bd8650a3a2bf3432375f8c97d5049d845ce56
- https://git.kernel.org/stable/c/83340c66b498e49353530e41542500fc8a4782d6
- https://git.kernel.org/stable/c/c1d3a84a67db910ce28a871273c992c3d7f9efb5
- https://git.kernel.org/stable/c/dcb4d14268595065c85dc5528056713928e17243
- https://ubuntu.com/security/CVE-2024-26752
- https://ubuntu.com/security/notices/USN-6820-1
- https://ubuntu.com/security/notices/USN-6820-2
- https://ubuntu.com/security/notices/USN-6821-1
- https://ubuntu.com/security/notices/USN-6821-2
- https://ubuntu.com/security/notices/USN-6821-3
- https://ubuntu.com/security/notices/USN-6821-4
- https://ubuntu.com/security/notices/USN-6828-1
- https://ubuntu.com/security/notices/USN-6831-1
- https://ubuntu.com/security/notices/USN-6867-1
- https://ubuntu.com/security/notices/USN-6871-1
- https://ubuntu.com/security/notices/USN-6892-1
- https://ubuntu.com/security/notices/USN-6919-1
- https://www.cve.org/CVERecord?id=CVE-2024-26752