CVE-2026-80841Hinoki check available

Use-after-free via premature TX_RING vmalloc teardown

Published Sep 4, 2026 · Updated Sep 4, 2026

Use-after-free in the Linux kernel allows attackers to access freed vmalloc-backed TX_RING memory during AF_PACKET teardown. tpacket_destruct_skb() drops the pending reference before writing the timestamp and TP_STATUS_AVAILABLE, while teardown can free a vmalloc mapping still referenced by an skb. Triggering the race requires an AF_PACKET TX_RING with vmalloc-backed blocks and in-flight skbs during ring replacement or socket close; published sources do not specify the resulting security impact or required privileges.

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 the Linux kernel allows attackers to access freed vmalloc-backed TX_RING memory during AF_PACKET teardown. tpacket_destruct_skb() drops the pending reference before writing the timestamp and TP_STATUS_AVAILABLE, while teardown can free a vmalloc mapping still referenced by an skb. Triggering the race requires an AF_PACKET TX_RING with vmalloc-backed blocks and in-flight skbs during ring replacement or socket close; published sources do not specify the resulting security impact or required privileges.

The record

CVE
CVE-2026-80841
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
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=3.14
  2. Affected versionversion=b013840810c221f2b0cf641d01531526052dc1fb <0189dce07db2dc059ae0570e06758ec4233c6e11
  3. Affected versionversion=b013840810c221f2b0cf641d01531526052dc1fb <550d00aa58193fb649a09a9c9e338c685adad784
  4. Affected versionversion=b013840810c221f2b0cf641d01531526052dc1fb <992cc9f94ca924089a506ba9b327caa9af797529

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.14; version=b013840810c221f2b0cf641d01531526052dc1fb <0189dce07db2dc059ae0570e06758ec4233c6e11; version=b013840810c221f2b0cf641d01531526052dc1fb <550d00aa58193fb649a09a9c9e338c685adad784; version=b013840810c221f2b0cf641d01531526052dc1fb <992cc9f94ca924089a506ba9b327caa9af797529

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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
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

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Your stack

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