linux-cve-announce - CVE-2026-23064: net/sched: act

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Message-ID: <2026020416-CVE-2026-23064-8eec@gregkh>
Date: Wed,  4 Feb 2026 17:14:23 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23064: net/sched: act_ife: avoid possible NULL deref

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

net/sched: act_ife: avoid possible NULL deref

tcf_ife_encode() must make sure ife_encode() does not return NULL.

syzbot reported:

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
 RIP: 0010:ife_tlv_meta_encode+0x41/0xa0 net/ife/ife.c:166
CPU: 3 UID: 0 PID: 8990 Comm: syz.0.696 Not tainted syzkaller #0 PREEMPT(full)
Call Trace:
 <TASK>
  ife_encode_meta_u32+0x153/0x180 net/sched/act_ife.c:101
  tcf_ife_encode net/sched/act_ife.c:841 [inline]
  tcf_ife_act+0x1022/0x1de0 net/sched/act_ife.c:877
  tc_act include/net/tc_wrapper.h:130 [inline]
  tcf_action_exec+0x1c0/0xa20 net/sched/act_api.c:1152
  tcf_exts_exec include/net/pkt_cls.h:349 [inline]
  mall_classify+0x1a0/0x2a0 net/sched/cls_matchall.c:42
  tc_classify include/net/tc_wrapper.h:197 [inline]
  __tcf_classify net/sched/cls_api.c:1764 [inline]
  tcf_classify+0x7f2/0x1380 net/sched/cls_api.c:1860
  multiq_classify net/sched/sch_multiq.c:39 [inline]
  multiq_enqueue+0xe0/0x510 net/sched/sch_multiq.c:66
  dev_qdisc_enqueue+0x45/0x250 net/core/dev.c:4147
  __dev_xmit_skb net/core/dev.c:4262 [inline]
  __dev_queue_xmit+0x2998/0x46c0 net/core/dev.c:4798

The Linux kernel CVE team has assigned CVE-2026-23064 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 4.11 with commit 295a6e06d21e1f469c9f38b00125a13b60ad4e7c and fixed in 6.6.122 with commit 03710cebfc0bcfe247a9e04381e79ea33896e278
	Issue introduced in 4.11 with commit 295a6e06d21e1f469c9f38b00125a13b60ad4e7c and fixed in 6.12.68 with commit 374915dfc932adf57712df3be010667fd1190e3c
	Issue introduced in 4.11 with commit 295a6e06d21e1f469c9f38b00125a13b60ad4e7c and fixed in 6.18.8 with commit 6c75fed55080014545f262b7055081cec4768b20
	Issue introduced in 4.11 with commit 295a6e06d21e1f469c9f38b00125a13b60ad4e7c and fixed in 6.19-rc7 with commit 27880b0b0d35ad1c98863d09788254e36f874968

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-2026-23064
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/sched/act_ife.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/03710cebfc0bcfe247a9e04381e79ea33896e278
	https://git.kernel.org/stable/c/374915dfc932adf57712df3be010667fd1190e3c
	https://git.kernel.org/stable/c/6c75fed55080014545f262b7055081cec4768b20
	https://git.kernel.org/stable/c/27880b0b0d35ad1c98863d09788254e36f874968