CVE-2026-74545Network attack vector

Kernel memory corruption via rtase skb double free

Published Aug 15, 2026 · Updated Aug 15, 2026

Double free in Linux 6.12 before 6.12.103, 6.18 before 6.18.44, 7.1 before 7.1.8, and 7.2 before 7.2-rc6 corrupts kernel memory. After rtase_xmit_frags() maps every fragment, rtase_tx_clear_range() frees the skb through its last-fragment descriptor before a common error label frees it again. A multi-fragment skb and subsequent head-buffer DMA-mapping failure are required; no public source establishes that attackers can force that failure.

CVSS severity9.8
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in Linux 6.12 before 6.12.103, 6.18 before 6.18.44, 7.1 before 7.1.8, and 7.2 before 7.2-rc6 corrupts kernel memory. After rtase_xmit_frags() maps every fragment, rtase_tx_clear_range() frees the skb through its last-fragment descriptor before a common error label frees it again. A multi-fragment skb and subsequent head-buffer DMA-mapping failure are required; no public source establishes that attackers can force that failure.

The record

CVE
CVE-2026-74545
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=6.12
  2. Affected versionversion=d6e882b89fdf80be0ab4f914ec10f75215e49495 <4f09172aff5f73a5e914f4fbc0d00a1c2ea9f7cb
  3. Affected versionversion=d6e882b89fdf80be0ab4f914ec10f75215e49495 <6fb7b769d6ed6d1d2e02af4a80e57a2477f35086
  4. Affected versionversion=d6e882b89fdf80be0ab4f914ec10f75215e49495 <db986098f30881fafcc752800aa3b13fd289c922
  5. Affected versionversion=d6e882b89fdf80be0ab4f914ec10f75215e49495 <de691dc3227b061c4d0beba9f0128fe1ff33dd68

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.12; version=d6e882b89fdf80be0ab4f914ec10f75215e49495 <4f09172aff5f73a5e914f4fbc0d00a1c2ea9f7cb; version=d6e882b89fdf80be0ab4f914ec10f75215e49495 <6fb7b769d6ed6d1d2e02af4a80e57a2477f35086; version=d6e882b89fdf80be0ab4f914ec10f75215e49495 <db986098f30881fafcc752800aa3b13fd289c922; version=d6e882b89fdf80be0ab4f914ec10f75215e49495 <de691dc3227b061c4d0beba9f0128fe1ff33dd68

Published CVSS scores

7.0SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
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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