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CVE-2026-98320— netfilter: flowtable: hold reference on ct until flow is released

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: flowtable: 在流表释放前保持对连接跟踪（conntrack）的引用 nf_ct_put() 会立即释放 ct->ext 区域。同时，RCU 类型安全的语义机制也可能导致从流表数据路径中引用到错误的连接跟踪项。因此，应在 RCU 宽限期结束后，直到流表条目被释放之前，始终保持对连接跟踪（ct）的引用。 此外，在模块退出路径上添加 rcu_barrier()，以确保在模块卸载前，所有待处理的流表条目均已释放。

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1200 · Hardware Additions

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0ff90b6c20340e57616a51ae1a1bf18156d6638a< 93ff1594be1aad4da364462dd8db050ebcfda2de affected
0ff90b6c20340e57616a51ae1a1bf18156d6638a< eed6997e8dc40593a539fcc722e7ed51b18db86c affected
0ff90b6c20340e57616a51ae1a1bf18156d6638a< 61c6688be282277c6e91ab286a7acd0ae8681ac6 affected
0ff90b6c20340e57616a51ae1a1bf18156d6638a< a43cd2b67b91e943273c913237a7a88c50cdcfbc affected
0ff90b6c20340e57616a51ae1a1bf18156d6638a< 8274cdc5f9c57e17ed77fc4ba76212536c840f25 affected
0ff90b6c20340e57616a51ae1a1bf18156d6638a< 12c1ac230f4ca16e0017b62a963ab75e0b48074f affected
0ff90b6c20340e57616a51ae1a1bf18156d6638a< d9e6175a3ee48209ee65f294fc567b4e16b29b74 affected
0ff90b6c20340e57616a51ae1a1bf18156d6638a< e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0d affected
… +10 more rows
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I. Basic Information for CVE-2026-98320

Vulnerability Information
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Vulnerability Title
netfilter: flowtable: hold reference on ct until flow is released
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: hold reference on ct until flow is released nf_ct_put() releases the ct->ext area inmediately, the rcu typesafe semantics also allow to refer to the wrong conntrack from the flowtable datapath. Hold reference on ct until flow is released after rcu grace period. Add rcu_barrier() on module exit path, to ensure pending flow entries are release before module goes away.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0ff90b6c20340e57616a51ae1a1bf18156d6638a ~ 93ff1594be1aad4da364462dd8db050ebcfda2de -
Linux Linux 4.16 -

II. Public POCs for CVE-2026-98320

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III. Intelligence Information for CVE-2026-98320

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Patches & Fixes for CVE-2026-98320 (8)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
CVE-2026-98261 8.1 HIGH cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98305 7.8 HIGH net: dsa: mxl862xx: disable the stats poll on teardown
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98311 7.8 HIGH wifi: virt_wifi: don't transfer operstate before register
CVE-2026-98276 7.8 HIGH net: lock the socket in sock_gettstamp()
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list
CVE-2026-98260 7.8 HIGH exec: Cleanup POSIX timers right after de_thread()
CVE-2026-98256 7.8 HIGH signal: Prevent exec() race

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98320

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