CVE-2026-80837Hinoki check available

Kernel memory corruption via unlocked notification queue

Published Sep 4, 2026 · Updated Sep 4, 2026

Use-after-free in Linux nf_tables allows attackers to corrupt kernel memory by racing quota notifications with transaction commits. The packet-path nft_obj_notify() function appends an skb to the unlocked notify_list while nf_tables_commit() can remove and free that same skb on another CPU. Triggering the write requires traffic through a depleted quota-object rule concurrent with a netlink commit; the published trace demonstrates memory corruption but does not establish code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux nf_tables allows attackers to corrupt kernel memory by racing quota notifications with transaction commits. The packet-path nft_obj_notify() function appends an skb to the unlocked notify_list while nf_tables_commit() can remove and free that same skb on another CPU. Triggering the write requires traffic through a depleted quota-object rule concurrent with a netlink commit; the published trace demonstrates memory corruption but does not establish code execution.

The record

CVE
CVE-2026-80837
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.9
  2. Affected versionversion=67cc570edaa02016a8685a06a0ee91f05a6277d9 <68de7f3a38acab355c24114f77bf00d3094ce4da
  3. Affected versionversion=67cc570edaa02016a8685a06a0ee91f05a6277d9 <6fa88d11983c6fe693c13ed7c5b3b75ae9f39de6
  4. Affected versionversion=67cc570edaa02016a8685a06a0ee91f05a6277d9 <7904b94768e983bcb2be34a8d6d1f3450f5b838b
  5. Affected versionversion=67cc570edaa02016a8685a06a0ee91f05a6277d9 <df86c0e84025be8b6dd572a20852698927aa666b
  6. Affected versionversion=67cc570edaa02016a8685a06a0ee91f05a6277d9 <e97e2d6d0b150fd78be573f9fdf193f204d9334e

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.9; version=67cc570edaa02016a8685a06a0ee91f05a6277d9 <68de7f3a38acab355c24114f77bf00d3094ce4da; version=67cc570edaa02016a8685a06a0ee91f05a6277d9 <6fa88d11983c6fe693c13ed7c5b3b75ae9f39de6; version=67cc570edaa02016a8685a06a0ee91f05a6277d9 <7904b94768e983bcb2be34a8d6d1f3450f5b838b; version=67cc570edaa02016a8685a06a0ee91f05a6277d9 <df86c0e84025be8b6dd572a20852698927aa666b; version=67cc570edaa02016a8685a06a0ee91f05a6277d9 <e97e2d6d0b150fd78be573f9fdf193f204d9334e

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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