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From: Greg KH <greg@kroah.com>
To: shaos <shawnq1@163.com>
Cc: jhs@mojatatu.com, Jiri Pirko <jiri@resnulli.us>,
	"David S . Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Simon Horman <horms@kernel.org>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	security@kernel.org
Subject: Re: [BUG] net/sched: act_ife can emit uninitialized bytes for zero metadata
Date: Thu, 22 Oct 2026 16:56:37 +0200	[thread overview]
Message-ID: <2026102244-cadillac-sworn-cee4@gregkh> (raw)
In-Reply-To: <20261022144739.61342-1-shawnq1@163.com>

On Thu, Oct 22, 2026 at 02:47:39PM +0000, shaos wrote:
> Hello,
> 
> An attacker with only namespace-scoped CAP_NET_ADMIN and CAP_NET_RAW installs a matchall IFE encode action carrying a zero-valued skb mark in a fresh user/network namespace. The presence callback reserves an 8-byte TLV, but the encoder emits no value bytes. The resulting frame contains six bytes from a freed kmalloc object previously populated by a different UID.

You sent these all to public mailing lists, and you seem to have
forgotten to include a patch for them?  Please do so.

thanks,

greg k-h

      reply	other threads:[~2026-10-22 14:56 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-22 14:47 shaos
2026-10-22 14:56 ` Greg KH [this message]

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