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…
Does this matter?
Lower severity and a low EPSS score (0.25%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.25% probability · 17th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-131
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
- https://git.kernel.org/stable/c/dcb4d14268595065c85dc5528056713928e17243Patch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlMailing List
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.