CVE-2025-37786

Memory corruption via stale DSA routing links

Published May 1, 2025 · Updated May 11, 2026

Use-after-free in affected Linux kernel branches allows local users to corrupt memory during DSA switch-tree probe failure. When the final switch setup is deferred or fails, dsa_register_switch() frees its ports but leaves dst->rtable entries pointing to them. A later switch setup dereferences those stale links; reachability requires a cascaded DSA switch tree and a probe failure after tree completion, and the observed result is a KASAN-detected invalid read.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in affected Linux kernel branches allows local users to corrupt memory during DSA switch-tree probe failure. When the final switch setup is deferred or fails, dsa_register_switch() frees its ports but leaves dst->rtable entries pointing to them. A later switch setup dereferences those stale links; reachability requires a cascaded DSA switch tree and a probe failure after tree completion, and the observed result is a KASAN-detected invalid read.

The record

CVE
CVE-2025-37786
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.5
  2. Affected versionversion=c5f51765a1f60b701840544faf3ca63204b8dc3c <51df5513cca6349d0bea01bab95cd96cf869976e
  3. Affected versionversion=c5f51765a1f60b701840544faf3ca63204b8dc3c <5c8066fbdb9653c6e9a224bdcd8f9c91a484f0de
  4. Affected versionversion=c5f51765a1f60b701840544faf3ca63204b8dc3c <6c20894d21600ca1e8549086dfbb986e277bf8a6
  5. Affected versionversion=c5f51765a1f60b701840544faf3ca63204b8dc3c <8bf108d7161ffc6880ad13a0cc109de3cf631727
  6. Affected versionversion=c5f51765a1f60b701840544faf3ca63204b8dc3c <a038f5f15af455dfe35bc68549e02b950978700a
  7. Affected versionversion=c5f51765a1f60b701840544faf3ca63204b8dc3c <fb12b460ec46c9efad98de6d9ba349691db51dc7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.5; version=c5f51765a1f60b701840544faf3ca63204b8dc3c <51df5513cca6349d0bea01bab95cd96cf869976e; version=c5f51765a1f60b701840544faf3ca63204b8dc3c <5c8066fbdb9653c6e9a224bdcd8f9c91a484f0de; version=c5f51765a1f60b701840544faf3ca63204b8dc3c <6c20894d21600ca1e8549086dfbb986e277bf8a6; version=c5f51765a1f60b701840544faf3ca63204b8dc3c <8bf108d7161ffc6880ad13a0cc109de3cf631727; version=c5f51765a1f60b701840544faf3ca63204b8dc3c <a038f5f15af455dfe35bc68549e02b950978700a; version=c5f51765a1f60b701840544faf3ca63204b8dc3c <fb12b460ec46c9efad98de6d9ba349691db51dc7

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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