Description
In the Linux kernel, the following vulnerability has been resolved: tcp: fix a signed-integer-overflow bug in tcp_add_backlog() The type of sk_rcvbuf and sk_sndbuf in struct sock is int, and in tcp_add_backlog(), the variable limit is caculated by adding sk_rcvbuf, sk_sndbuf and 64 * 1024, it may exceed the max value of int and overflow. This patch reduces the limit budget by halving the sndbuf to solve this issue since ACK packets are much smaller than the payload.
References5
- git.kernel.org/stable/c/28addf029417d53b1df062b4c87feb7bc033cb5f
- git.kernel.org/stable/c/4f23cb2be530785db284a685d1b1c30224d8a538
- git.kernel.org/stable/c/9d04b4d0feee12bce6bfe37f30d8e953d3c30368
- git.kernel.org/stable/c/a85d39f14aa8a71e29cfb5eb5de02878a8779898
- git.kernel.org/stable/c/ec791d8149ff60c40ad2074af3b92a39c916a03f
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 45 · as of 11 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.