From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-cve-announce@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@kernel.org>
Subject: CVE-2026-97417: netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack()
Date: Thu, 24 Sep 2026 18:03:17 +0200 [thread overview]
Message-ID: <2026092427-CVE-2026-97417-e678@gregkh> (raw)
From: Greg Kroah-Hartman <gregkh@kernel.org>
Description
===========
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack()
The timestamp-only fast path dereferences the option stream as
*(__be32 *)ptr, which assumes 4-byte alignment that the TCP option
stream does not guarantee. Use get_unaligned_be32() instead, which
reads the value safely and already returns host byte order, so the
htonl() on the comparison constant can be dropped.
This matches the existing get_unaligned_be32() use later in the same
function.
The Linux kernel CVE team has assigned CVE-2026-97417 to this issue.
Affected and fixed versions
===========================
Fixed in 6.12.111 with commit 7ecfa46a536578a7ed335ddf31a854127268c27c
Fixed in 6.18.53 with commit 4abc1af7ac209c066f4e5dd75cdd56876e5829a9
Fixed in 7.2 with commit d3bf9eae486490832bd08fd62ab0ac601f346bd4
Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.
Unaffected versions might change over time as fixes are backported to
older supported kernel versions. The official CVE entry at
https://cve.org/CVERecord/?id=CVE-2026-97417
will be updated if fixes are backported, please check that for the most
up to date information about this issue.
Affected files
==============
The file(s) affected by this issue are:
net/netfilter/nf_conntrack_proto_tcp.c
Mitigation
==========
The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes. Individual
changes are never tested alone, but rather are part of a larger kernel
release. Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all. If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
https://git.kernel.org/stable/c/7ecfa46a536578a7ed335ddf31a854127268c27c
https://git.kernel.org/stable/c/4abc1af7ac209c066f4e5dd75cdd56876e5829a9
https://git.kernel.org/stable/c/d3bf9eae486490832bd08fd62ab0ac601f346bd4
reply other threads:[~2026-09-24 16:12 UTC|newest]
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