Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.19.296, < 4.19.308 |
| Debian | Debian Linux | 10.0 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0da15a70395182ee8cb75716baf00dddc0bea38dPatch
- https://git.kernel.org/stable/c/13cd1daeea848614e585b2c6ecc11ca9c8ab2500Patch
- https://git.kernel.org/stable/c/359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79Patch
- https://git.kernel.org/stable/c/4c3ce64bc9d36ca9164dd6c77ff144c121011aaePatch
- https://git.kernel.org/stable/c/804bd8650a3a2bf3432375f8c97d5049d845ce56Patch
- https://git.kernel.org/stable/c/83340c66b498e49353530e41542500fc8a4782d6Patch
- https://git.kernel.org/stable/c/c1d3a84a67db910ce28a871273c992c3d7f9efb5Patch
- https://git.kernel.org/stable/c/dcb4d14268595065c85dc5528056713928e17243Patch
- https://git.kernel.org/stable/c/0da15a70395182ee8cb75716baf00dddc0bea38dPatch
- https://git.kernel.org/stable/c/13cd1daeea848614e585b2c6ecc11ca9c8ab2500Patch
- https://git.kernel.org/stable/c/359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79Patch
- https://git.kernel.org/stable/c/4c3ce64bc9d36ca9164dd6c77ff144c121011aaePatch
- https://git.kernel.org/stable/c/804bd8650a3a2bf3432375f8c97d5049d845ce56Patch
- https://git.kernel.org/stable/c/83340c66b498e49353530e41542500fc8a4782d6Patch
- https://git.kernel.org/stable/c/c1d3a84a67db910ce28a871273c992c3d7f9efb5Patch
FAQ
What is CVE-2024-26752?
CVE-2024-26752 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 whe...
How severe is CVE-2024-26752?
CVE-2024-26752 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-26752?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.