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CVE-2026-23391— netfilter: xt_CT: drop pending enqueued packets on template removal

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未丢弃排队数据包，可能导致使用已释放对象。

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 24de58f465165298aaa8f286b2592f0163706cfe< 55445134d42b84cb0a272e42c98d233ca65eca83 affected
24de58f465165298aaa8f286b2592f0163706cfe< cc57506dd66555899560b9c0f24e813f034e12ec affected
24de58f465165298aaa8f286b2592f0163706cfe< d2d0bae0c9a2a17b6990a2966f5cdce0813d6256 affected
24de58f465165298aaa8f286b2592f0163706cfe< 63b8097cea1923fe82cd598068d0796da8c015ec affected
24de58f465165298aaa8f286b2592f0163706cfe< 19a230dec6bb8928e3f96387f9085cf2c79bcef9 affected
24de58f465165298aaa8f286b2592f0163706cfe< cb549925875fa06dd155e49db4ac2c5044c30f9c affected
24de58f465165298aaa8f286b2592f0163706cfe< 777d02efe3d630cca4c1b63962cec17c57711325 affected
24de58f465165298aaa8f286b2592f0163706cfe< f62a218a946b19bb59abdd5361da85fa4606b96b affected
… +10 more rows
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I. Basic Information for CVE-2026-23391

Vulnerability Information
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Vulnerability Title
netfilter: xt_CT: drop pending enqueued packets on template removal
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_CT: drop pending enqueued packets on template removal Templates refer to objects that can go away while packets are sitting in nfqueue refer to: - helper, this can be an issue on module removal. - timeout policy, nfnetlink_cttimeout might remove it. The use of templates with zone and event cache filter are safe, since this just copies values. Flush these enqueued packets in case the template rule gets removed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未丢弃排队数据包，可能导致使用已释放对象。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 24de58f465165298aaa8f286b2592f0163706cfe ~ 55445134d42b84cb0a272e42c98d233ca65eca83 -
Linux Linux 3.4 -

II. Public POCs for CVE-2026-23391

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III. Intelligence Information for CVE-2026-23391

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Patches & Fixes for CVE-2026-23391 (6)

Same Patch Batch · Linux · 2026-03-25 · 116 CVEs total

CVE-2026-23395 8.8 HIGH Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ
CVE-2026-31788 8.2 HIGH xen/privcmd: restrict usage in unprivileged domU
CVE-2026-23340 7.8 HIGH net: sched: avoid qdisc_reset_all_tx_gt() vs dequeue race for lockless qdiscs
CVE-2026-23336 7.8 HIGH wifi: cfg80211: cancel rfkill_block work in wiphy_unregister()
CVE-2026-23350 7.8 HIGH drm/xe/queue: Call fini on exec queue creation fail
CVE-2026-23351 7.8 HIGH netfilter: nft_set_pipapo: split gc into unlink and reclaim phase
CVE-2026-23317 7.8 HIGH drm/vmwgfx: Return the correct value in vmw_translate_ptr functions
CVE-2026-23306 7.8 HIGH scsi: pm8001: Fix use-after-free in pm8001_queue_command()
CVE-2026-23372 7.8 HIGH nfc: rawsock: cancel tx_work before socket teardown
CVE-2026-23378 7.8 HIGH net/sched: act_ife: Fix metalist update behavior
CVE-2026-23383 7.8 HIGH bpf, arm64: Force 8-byte alignment for JIT buffer to prevent atomic tearing
CVE-2026-23392 7.8 HIGH netfilter: nf_tables: release flowtable after rcu grace period on error
CVE-2026-23393 7.8 HIGH bridge: cfm: Fix race condition in peer_mep deletion
CVE-2026-23288 7.8 HIGH accel/amdxdna: Fix out-of-bounds memset in command slot handling
CVE-2026-23280 7.8 HIGH accel/amdxdna: Prevent ubuf size overflow
CVE-2026-23364 7.4 HIGH ksmbd: Compare MACs in constant time
CVE-2026-23294 7.0 HIGH bpf: Fix race in devmap on PREEMPT_RT
CVE-2026-23354 x86/fred: Correct speculative safety in fred_extint()
CVE-2026-23356 drbd: fix "LOGIC BUG" in drbd_al_begin_io_nonblock()
CVE-2026-23352 x86/efi: defer freeing of boot services memory

Showing top 20 of 116 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23391

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