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CVE-2026-80668— netfilter: nf_conntrack_expect: use conntrack GC to reap expectations

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.

在 Linux 内核中，以下漏洞已得到修复： netfilter: nf_conntrack_expect：使用 conntrack GC 来回收 expectations 该补丁将原本基于定时器（timer）API 的机制替换为基于垃圾收集器（GC worker）的方法，这一改变在许多其他子系统中已经实施。 具体而言，该补丁利用现有的 conntrack GC worker，遍历主 conntrack 条目本地维护的 expectations 列表，以清理已过期的 expectations。 主要技术细节如下：

CVSS 9.8 · Critical EPSS 0.15% · P5

Possible ATT&CK Techniques 2 AI

T1400 T1598 · Phishing for Information

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5< 7ec786f4230c2a9b2eaf97a2d45368933b49d2b2 affected
bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5< b8b09dc2bf35a00d4e0556b5d6308c7b917ebda2 affected
9e1196d27ef496f404c76f7a9d03761142d991c4 affected
5e1c1d22268ae710c238342c8030c21daf298168 affected
d52fa1fa7440676b8c238037a050ab008c22737f affected
f338ced0473849c9f6ed0b77ca99f1aab5826787 affected
497f99b26fffdc5635706d1b4811f1ed8ee21a5b affected
6.1.176< 6.2 affected
… +8 more rows
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I. Basic Information for CVE-2026-80668

Vulnerability Information
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Vulnerability Title
netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: use conntrack GC to reap expectations This patch replaces the timer API by GC worker approach for expectations, as it already happened in many other subsystems. Use the existing conntrack GC worker to iterate over the local list of expectations in the master conntrack to reap expired expectations. Check IPS_HELPER_BIT to run GC for expectations, set it on for nft_ct expectation which nevers sets it. Hold the expectation spinlock while iterating over the master conntrack expectation list to synchronize with nf_ct_remove_expectations(). This also performs runtime packet path garbage collection through the expectation insertion and lookup functions while walking over one of the chains of the global expectation hashtables. Unconfirmed conntrack entries are skipped since ct->ext can be reallocated and dying are skipped since those will be gone soon. Set on IPS_HELPER_BIT if the helper ct extension is added, then the new GC worker does not need to bump the ct refcount to check if the ct->ext helper is available. This removes the extra bump on the refcount for expectation timers, this allows to remove several nf_ct_expect_put() calls after the unlink, after this update only refcount remains at 1 while on the expectation hashes. This patch implicitly addresses a race with the existing timer API allowing an expectation to access a stale exp->master pointer which has been already released when expectation removal loses races with an expiring timer, ie. timer_del() reporting false. Add a new NF_CT_EXPECT_DEAD flag to reap this expectation via GC. This is needed by nf_conntrack_unexpect_related() which is called in error paths to invalidate newly created expectations that has been added into the hashes. These expectactions cannot be inmediately released as GC or nf_ct_remove_expectations() could race to make it. On expectation insert, the runtime GC reaps stale expectations before checking the expectation limit set by policy. Set current timestamp in nf_ct_expect_alloc(), then add the expectation policy timeout (or custom timeout specified added on top of this) to specify the expectation lifetime.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5 ~ 7ec786f4230c2a9b2eaf97a2d45368933b49d2b2 -
Linux Linux 7.0 -

II. Public POCs for CVE-2026-80668

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III. Intelligence Information for CVE-2026-80668

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Patches & Fixes for CVE-2026-80668 (2)

Same Patch Batch · Linux · 2026-08-28 · 135 CVEs total

CVE-2026-80694 9.8 CRITICAL net: ethernet: mtk_eth_soc: pass eth to mtk_handle_irq_rx in poll_controller
CVE-2026-80673 9.8 CRITICAL ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()
CVE-2026-80634 9.8 CRITICAL netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag
CVE-2026-80674 9.8 CRITICAL ntfs: validate resident attribute lists and harden the validator
CVE-2026-80630 9.8 CRITICAL net/sched: sch_fq_codel: Do not call qdisc_tree_reduce_backlog during peek before restorin
CVE-2026-80617 9.8 CRITICAL net: airoha: fix foe_check_time allocation size
CVE-2026-80612 9.8 CRITICAL net: lwtunnel: Drop skb metadata before LWT encapsulation
CVE-2026-80714 9.8 CRITICAL ipvs: do not propagate one-packet flag to synced conns
CVE-2026-80609 9.8 CRITICAL qede: fix out-of-bounds check for cqe->len_list[]
CVE-2026-80681 9.8 CRITICAL vxlan: re-fetch eth header after route_shortcircuit()
CVE-2026-80600 9.8 CRITICAL batman-adv: dat: acquire ARP hw source only after skb realloc
CVE-2026-80671 9.3 CRITICAL perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
CVE-2026-80693 9.3 CRITICAL idpf: bound interrupt-vector register fill to the allocated array
CVE-2026-80684 9.3 CRITICAL KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
CVE-2026-80603 9.1 CRITICAL netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read
CVE-2026-80670 9.1 CRITICAL perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
CVE-2026-80683 8.8 HIGH Bluetooth: SCO: give the socket its own sco_conn reference
CVE-2026-80692 8.8 HIGH Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks
CVE-2026-80672 8.8 HIGH ntfs: fix u16 truncation of restart-area length check
CVE-2026-80633 8.8 HIGH iommufd: Take dma_resv lock before dma_buf_unpin() in release path

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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