Date: Tue, 30 Jun 2026 17:22:00 +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: 490e506a1ca8 - releng/15.1 - rack: Reload the TCP stack PCB after reacquiring the inpcb lock Message-ID: <6a43fb38.45d49.77d4b6cb@gitrepo.freebsd.org>
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The branch releng/15.1 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=490e506a1ca8e766340fdea1a72eeea27e006293 commit 490e506a1ca8e766340fdea1a72eeea27e006293 Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2026-06-23 21:46:17 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2026-06-29 19:16:40 +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 219cf2758ff2..86ea34f46a05 100644 --- a/sys/netinet/tcp_stacks/rack.c +++ b/sys/netinet/tcp_stacks/rack.c @@ -24136,6 +24136,7 @@ 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
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