Improper Handling of Length Parameter Inconsistency Affecting kernel-tools-devel package, versions <0:4.14.343-259.562.amzn2
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Test your applications- Snyk ID SNYK-AMZN2-KERNELTOOLSDEVEL-7710842
- published 20 Aug 2024
- disclosed 3 Apr 2024
Introduced: 3 Apr 2024
CVE-2024-26752 Open this link in a new tabHow to fix?
Upgrade Amazon-Linux:2 kernel-tools-devel to version 0:4.14.343-259.562.amzn2 or higher.
This issue was patched in ALAS2-2024-2549.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-tools-devel package and not the kernel-tools-devel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
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
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26752
- 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://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html