From: "Chuck Lever" <cel@kernel.org>
To: ven0mfuzzer <ven0mkernelfuzzer@gmail.com>,
"Tom Talpey" <tom@talpey.com>,
"Chuck Lever" <chuck.lever@oracle.com>,
"Olga Kornievskaia" <okorniev@redhat.com>,
NeilBrown <neil@brown.name>, "Dai Ngo" <Dai.Ngo@oracle.com>,
"Jeff Layton" <jlayton@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org
Subject: Re: [BUG] Linux Kernel NFS Server refcount_t Underflow in nfs3svc_release_getacl (S→C)
Date: Thu, 02 Apr 2026 15:06:26 -0400 [thread overview]
Message-ID: <a3923198-25b6-454b-90b8-9a59893abad9@app.fastmail.com> (raw)
In-Reply-To: <69ce4d8f.170a0220.1c5378.9cf5@mx.google.com>
On Thu, Apr 2, 2026, at 7:05 AM, ven0mfuzzer wrote:
> Linux Kernel NFS Server refcount_t Underflow in nfs3svc_release_getacl (S→C)
>
> 1. Vulnerability Title
>
> Linux Kernel NFS Server (nfsd) refcount_t Underflow via Malicious
> GETACL Request with Corrupted File Handle
The described mechanism -- a refcount underflow from fh_put on an
uninitialized handle -- cannot occur because the SunRPC layer
zero-initializes the response buffer and fh_put() guards all
refcount operations behind NULL checks.
--
Chuck Lever
prev parent reply other threads:[~2026-04-02 19:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-02 11:05 [BUG] Linux Kernel NFS Server refcount_t Underflow in nfs3svc_release_getacl (S→C) ven0mfuzzer
2026-04-02 19:06 ` Chuck Lever [this message]
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