Medium 5.5Published Feb 4, 2026

CVE-2026-23064net/sched: act_ife: avoid possible NULL deref

Updated under an hour ago (Oct 27, 2026, 6:00 AM ET)

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Exploited in the last 30 days

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

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	295a6e06d21e1f469c9f38b00125a13b60ad4e7c builds before 4ef2c77851676b7ed106f0c47755bee9eeec9a40; from 295a6e06d21e1f469c9f38b00125a13b60ad4e7c before dd9442aedbeae87c44cc64c0ee41abd296dc008b; from 295a6e06d21e1f469c9f38b00125a13b60ad4e7c before 1440d749fe49c8665da6f744323b1671d25a56a0; from 295a6e06d21e1f469c9f38b00125a13b60ad4e7c before 03710cebfc0bcfe247a9e04381e79ea33896e278; from 295a6e06d21e1f469c9f38b00125a13b60ad4e7c before 374915dfc932adf57712df3be010667fd1190e3c; 295a6e06d21e1f469c9f38b00125a13b60ad4e7c builds before 6c75fed55080014545f262b7055081cec4768b20; from 295a6e06d21e1f469c9f38b00125a13b60ad4e7c before 27880b0b0d35ad1c98863d09788254e36f874968	CNA record
linux linux_kernel linux:linux_kernel	from 4.11 before 5.10.249; from 5.11 before 5.15.199; from 5.16 before 6.1.162; from 6.2 before 6.6.122; from 6.7 before 6.12.68; from 6.13 before 6.18.8; 6.19; 6.19; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/4ef2c77851676b7ed106f0c47755bee9eeec9a40	patch
https://git.kernel.org/stable/c/dd9442aedbeae87c44cc64c0ee41abd296dc008b	patch
https://git.kernel.org/stable/c/1440d749fe49c8665da6f744323b1671d25a56a0	patch
https://git.kernel.org/stable/c/03710cebfc0bcfe247a9e04381e79ea33896e278	patch
https://git.kernel.org/stable/c/374915dfc932adf57712df3be010667fd1190e3c	patch
https://git.kernel.org/stable/c/6c75fed55080014545f262b7055081cec4768b20	patch
https://git.kernel.org/stable/c/27880b0b0d35ad1c98863d09788254e36f874968	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.