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Thu, 20 Aug 2026 08:40:36 -0400 (EDT) Date: Thu, 20 Aug 2026 14:32:14 +0200 From: Greg KH To: Artem Dinaburg Cc: stable@vger.kernel.org, Xiang Mei , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH 6.1.y] net: bonding: fix use-after-free in bond_xmit_broadcast() Message-ID: <2026082028-curled-try-e7c5@gregkh> References: <20260819165924.1184-1-artem@trailofbits.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260819165924.1184-1-artem@trailofbits.com> On Wed, Aug 19, 2026 at 12:59:22PM -0400, Artem Dinaburg wrote: > From: Xiang Mei > > Please queue the attached backport of upstream commit 2884bf72fb8f. It fixes > CVE-2026-31419 in 6.1.y. > > An unprivileged user can create a broadcast bond and dummy slaves in a user > and network namespace. Racing ordinary packet sends with slave release makes > `bond_xmit_broadcast()` give the same skb to two transmitters. I reproduced a > KASAN use-after-free in `skb_clone()` on v6.1.182. > > The attached one-line upstream fix applies cleanly to v6.1.182. The same > workload completed over one million sends and 299 slave mutations with the > patched module and no sanitizer, oops, lock, or BUG output. > > The fix is already released in 6.6.143, 6.12.95, 6.18.22, and 6.19.12, but no > corresponding fix is present in 6.1.y. > > Signed-off-by: Artem Dinaburg You stripped off all of the original commit changelog info :( thanks, greg k-h