Description
The tcp_cwnd_reduction function in net/ipv4/tcp_input.c in the Linux kernel before 4.3.5 allows remote attackers to cause a denial of service (divide-by-zero error and system crash) via crafted TCP traffic.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.3.5-1 | — |
| Debian 13 | linux | 4.3.5-1 | — |
| Debian 12 | linux | 4.3.5-1 | — |
References
- [oss-security] 20160125 Linux potential division by zero in TCP code mailing-list
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.5
- https://github.com/torvalds/linux/commit/8b8a321ff72c785ed5e8b4cf6eda20b35d427390
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8b8a321ff72c785ed5e8b4cf6eda20b35d427390
- https://bugzilla.redhat.com/show_bug.cgi?id=1302219