CVE-2026-98321— netfilter: nf_nat: unregister and release hooks on error
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，已修复以下漏洞： netfilter: nf_nat：在发生错误时注销并释放挂钩（hooks） 如果 调用失败，则 NAT 挂钩（hooks）将永远不会被释放，从而导致内存泄漏。 为解决此问题，推迟设置 的时间，直到挂钩实际注册完成。这样可以简化错误处理路径，以便更明确地判断是否需要对 NAT 挂钩进行回退（unwinding）操作。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 1cd472bf036ca038e783ef5f058f54e45b7e8180< 79084567cd082fb4482e1ea457580e7d6504dd99 |
affected |
1cd472bf036ca038e783ef5f058f54e45b7e8180< df80342f4bfc023ad7d6703df5e27f583ff0cb8d |
affected | ||
1cd472bf036ca038e783ef5f058f54e45b7e8180< cbdd39ce42530a193c56beb206a3356cb6d01016 |
affected | ||
4.18 |
affected | ||
< 4.18 |
unaffected | ||
6.18.54≤ 6.18.* |
unaffected | ||
7.2.8≤ 7.2.* |
unaffected | ||
7.3-rc4≤ * |
unaffected |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-98321
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
netfilter: nf_nat: unregister and release hooks on error
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_nat: unregister and release hooks on error
If nf_hook_entries_insert_raw() fails, the NAT hooks get never released,
resulting in a memleak.
Postpone setting nat_proto_net->nat_hook_ops when the hooks are
registered to simplify the error path to decide whether the nat hooks
need unwinding.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-98321
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-98321
请登录查看更多情报信息。
Patches & Fixes for CVE-2026-98321 (3)
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-2026-98320 | 7.8 HIGH | netfilter: flowtable: hold reference on ct until flow is released |
| 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() |
Showing top 20 of 208 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98374
tcp: fix use-after-free of retransmit_skb_hint in tcp_send_s -
CVE-2026-98373
mm/hugetlb: preserve mremap address delta when skipping page -
CVE-2026-98372
xfrm: iptfs: fix stack OOB read in iptfs_skb_reset_frag_walk -
CVE-2026-98371
xfrm: iptfs: fix runt reassembly panic from short inner tot_ -
CVE-2026-98370
xfrm: fix compat ALLOCSPI request use-after-free
Same vendor: Linux
-
CVE-2026-98374
tcp: fix use-after-free of retransmit_skb_hint in tcp_send_s -
CVE-2026-98373
mm/hugetlb: preserve mremap address delta when skipping page -
CVE-2026-98372
xfrm: iptfs: fix stack OOB read in iptfs_skb_reset_frag_walk -
CVE-2026-98371
xfrm: iptfs: fix runt reassembly panic from short inner tot_ -
CVE-2026-98370
xfrm: fix compat ALLOCSPI request use-after-free
V. Comments for CVE-2026-98321
No comments yet