Date: Tue, 30 Jun 2026 17:21:28 +0000 From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 57b3853cc9bb - releng/15.0 - rack: Reload the TCP stack PCB after reacquiring the inpcb lock Message-ID: <6a43fb18.445cc.2a00bccc@gitrepo.freebsd.org>
index | next in thread | raw e-mail
The branch releng/15.0 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=57b3853cc9bbe164a82844eb9a0d5196ff52a8e7 commit 57b3853cc9bbe164a82844eb9a0d5196ff52a8e7 Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2026-06-23 21:46:17 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2026-06-30 02:32:57 +0000 rack: Reload the TCP stack PCB after reacquiring the inpcb lock Malicious userspace might switch TCP stacks twice while the inpcb lock is dropped. If it does so, the validation of tp->t_fb might succeed, but the saved pointer to the stack PCB might be invalid. Reload it to avoid this problem, as BBR already does. Approved by: so Security: FreeBSD-SA-26:43.tcp Security: CVE-2026-49422 Reported by: Maik Münch Reviewed by: tuexen Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D57791 --- sys/netinet/tcp_stacks/rack.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sys/netinet/tcp_stacks/rack.c b/sys/netinet/tcp_stacks/rack.c index 9bc4530afe10..462bd6c6aa0b 100644 --- a/sys/netinet/tcp_stacks/rack.c +++ b/sys/netinet/tcp_stacks/rack.c @@ -24138,6 +24138,7 @@ process_opt: INP_WUNLOCK(inp); return (ENOPROTOOPT); } + rack = (struct tcp_rack *)tp->t_fb_ptr; if (rack->defer_options && (rack->gp_ready == 0) && (sopt->sopt_name != TCP_DEFER_OPTIONS) && (sopt->sopt_name != TCP_HYBRID_PACING) &&home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?6a43fb18.445cc.2a00bccc>