CVE-2026-53151Network attack vector

Incorrect memory access via fragmented SACK parsing

Published Jun 25, 2026 · Updated Jun 25, 2026

Incorrect buffer access in AF_RXRPC allows remote attackers to affect Linux Kernel memory via fragmented ACK packets. AF_RXRPC assumes skb_condense() made the received sk_buff contiguous, then rxrpc_input_soft_acks() reads the SACK table from skb->data even when linearization silently failed. Reaching the flaw requires a deliberately fragmented UDP ACK for an AF_RXRPC call; the public record specifies no runtime outcome beyond incorrect buffer access.

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

Incorrect buffer access in AF_RXRPC allows remote attackers to affect Linux Kernel memory via fragmented ACK packets. AF_RXRPC assumes skb_condense() made the received sk_buff contiguous, then rxrpc_input_soft_acks() reads the SACK table from skb->data even when linearization silently failed. Reaching the flaw requires a deliberately fragmented UDP ACK for an AF_RXRPC call; the public record specifies no runtime outcome beyond incorrect buffer access.

The record

CVE
CVE-2026-53151
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=6.2
  2. Affected versionversion=d57a3a151660902091491ac2633134e1be92557f <224298450be5c04d2a6ea1c2a94669d7ebf65d00
  3. Affected versionversion=d57a3a151660902091491ac2633134e1be92557f <333b6d5bb9f87827ac2639c737bf9613dbae7253
  4. Affected versionversion=d57a3a151660902091491ac2633134e1be92557f <566c4c1244de50fbff1f89ff93c9d7b0fc256db4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.2; version=d57a3a151660902091491ac2633134e1be92557f <224298450be5c04d2a6ea1c2a94669d7ebf65d00; version=d57a3a151660902091491ac2633134e1be92557f <333b6d5bb9f87827ac2639c737bf9613dbae7253; version=d57a3a151660902091491ac2633134e1be92557f <566c4c1244de50fbff1f89ff93c9d7b0fc256db4

Published CVSS scores

9.8kernel.orgCVSS: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

T1190Exploit Public-Facing Application

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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