CVE-2026-74746

Use-after-free via premature flowtable tuple publication

Published Aug 26, 2026 · Updated Aug 26, 2026

Use-after-free in the Linux kernel netfilter flowtable allows attackers to trigger invalid memory reads and writes via a tuple-publication race. flow_offload_add() publishes the GC-owning original tuple before inserting the reply tuple, so nf_flow_table_iterate() can expose and free a partially installed flow while insertion still writes it. Triggering requires concurrent flow insertion and garbage collection; public material demonstrates KASAN slab read and write reports but does not establish attacker-controlled code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in the Linux kernel netfilter flowtable allows attackers to trigger invalid memory reads and writes via a tuple-publication race. flow_offload_add() publishes the GC-owning original tuple before inserting the reply tuple, so nf_flow_table_iterate() can expose and free a partially installed flow while insertion still writes it. Triggering requires concurrent flow insertion and garbage collection; public material demonstrates KASAN slab read and write reports but does not establish attacker-controlled code execution.

The record

CVE
CVE-2026-74746
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.16
  2. Affected versionversion=ac2a66665e231847cab11b8c8e844ce43207dd2e <0a00254585827f1695aa2700114af622ea754cfa
  3. Affected versionversion=ac2a66665e231847cab11b8c8e844ce43207dd2e <2014ac62df9d45bb9a004a043e85df7be09ed780
  4. Affected versionversion=ac2a66665e231847cab11b8c8e844ce43207dd2e <211ee5d998d92a7d548811939c65942d06c146e4
  5. Affected versionversion=ac2a66665e231847cab11b8c8e844ce43207dd2e <972fdf7c4f5c282a239c88fea614b056c33dc025
  6. Affected versionversion=ac2a66665e231847cab11b8c8e844ce43207dd2e <be345dcbddb4643a54252b954af974b16eda8f91
  7. Affected versionversion=ac2a66665e231847cab11b8c8e844ce43207dd2e <d16b71231e65cb05daea2b45701fcf09cef041e7
  8. Affected versionversion=ac2a66665e231847cab11b8c8e844ce43207dd2e <d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2
  9. Affected versionversion=ac2a66665e231847cab11b8c8e844ce43207dd2e <d9d3050a70efe217e73a0751e55fdae6a7092620

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=4.16; version=ac2a66665e231847cab11b8c8e844ce43207dd2e <0a00254585827f1695aa2700114af622ea754cfa; version=ac2a66665e231847cab11b8c8e844ce43207dd2e <2014ac62df9d45bb9a004a043e85df7be09ed780; version=ac2a66665e231847cab11b8c8e844ce43207dd2e <211ee5d998d92a7d548811939c65942d06c146e4; version=ac2a66665e231847cab11b8c8e844ce43207dd2e <972fdf7c4f5c282a239c88fea614b056c33dc025; version=ac2a66665e231847cab11b8c8e844ce43207dd2e <be345dcbddb4643a54252b954af974b16eda8f91; version=ac2a66665e231847cab11b8c8e844ce43207dd2e <d16b71231e65cb05daea2b45701fcf09cef041e7; version=ac2a66665e231847cab11b8c8e844ce43207dd2e <d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2; version=ac2a66665e231847cab11b8c8e844ce43207dd2e <d9d3050a70efe217e73a0751e55fdae6a7092620

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

No sourced classifications are available.

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo