CVE-2026-45970

Kernel memory corruption via ALB teardown race

Published May 27, 2026 · Updated May 27, 2026

Use-after-free in Linux Kernel's ALB bonding receive path allows local users to corrupt kernel memory or crash the system during bond teardown. rlb_deinitialize() frees rx_hashtbl while rlb_arp_recv() can remain active, so a concurrent ARP receive handler dereferences and writes through reclaimed heap memory. A low-privileged local user can control both sides of the race in a user and network namespace by injecting ARP frames while cycling a balance-alb bond up and down, with no victim interaction.

CVSS severity7.8
High
EPSS probability0.13%
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 Linux Kernel's ALB bonding receive path allows local users to corrupt kernel memory or crash the system during bond teardown. rlb_deinitialize() frees rx_hashtbl while rlb_arp_recv() can remain active, so a concurrent ARP receive handler dereferences and writes through reclaimed heap memory. A low-privileged local user can control both sides of the race in a user and network namespace by injecting ARP frames while cycling a balance-alb bond up and down, with no victim interaction.

The record

CVE
CVE-2026-45970
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=3.0
  2. Affected versionversion=3aba891dde3842d89ad022237b99c1ed308040b0 <c65cdf46ce340c9c00fbbaf84599d2daff43626e
  3. Affected versionversion=3aba891dde3842d89ad022237b99c1ed308040b0 <d31065526f160ee0244a719230aa069daca2bf4d
  4. Affected versionversion=3aba891dde3842d89ad022237b99c1ed308040b0 <db5435b5342e3aaa4521d0f3ccfe94316b253ca1
  5. Affected versionversion=3aba891dde3842d89ad022237b99c1ed308040b0 <de7c097800f07f3c108185c7a38b53a530ba30ff
  6. Affected versionversion=3aba891dde3842d89ad022237b99c1ed308040b0 <e6834a4c474697df23ab9948fd3577b26bf48656
  7. Affected versionversion=3aba891dde3842d89ad022237b99c1ed308040b0 <f94a0de7b9f32745a14a1621c63087a092823587
  8. Affected versionversion=3aba891dde3842d89ad022237b99c1ed308040b0 <fd54ddc929be1d6c3b3b7b35d6d4642a5d9e803c
  9. Affected versionversion=3aba891dde3842d89ad022237b99c1ed308040b0 <fef13c403be3fb685cb06419e6b3623106aab5ba

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.0; version=3aba891dde3842d89ad022237b99c1ed308040b0 <c65cdf46ce340c9c00fbbaf84599d2daff43626e; version=3aba891dde3842d89ad022237b99c1ed308040b0 <d31065526f160ee0244a719230aa069daca2bf4d; version=3aba891dde3842d89ad022237b99c1ed308040b0 <db5435b5342e3aaa4521d0f3ccfe94316b253ca1; version=3aba891dde3842d89ad022237b99c1ed308040b0 <de7c097800f07f3c108185c7a38b53a530ba30ff; version=3aba891dde3842d89ad022237b99c1ed308040b0 <e6834a4c474697df23ab9948fd3577b26bf48656; version=3aba891dde3842d89ad022237b99c1ed308040b0 <f94a0de7b9f32745a14a1621c63087a092823587; version=3aba891dde3842d89ad022237b99c1ed308040b0 <fd54ddc929be1d6c3b3b7b35d6d4642a5d9e803c; version=3aba891dde3842d89ad022237b99c1ed308040b0 <fef13c403be3fb685cb06419e6b3623106aab5ba

Published CVSS scores

7.8kernel.orgCVSS: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
T1499Endpoint Denial of Service

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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