CVE-2026-23326

Local packet-buffer leak via stale list node

Published Mar 25, 2026 · Updated Mar 25, 2026

Resource leak in Linux Kernel 6.13 through 6.18.16 and 6.19 through 6.19.6 allows local users to retain AF_XDP packet buffers. Fragment paths remove list_node with list_del(), leaving stale pointers that make xp_free() treat the buffer as already queued and skip returning it to the free list. Low-privileged local access to AF_XDP fragment handling is required; repeated triggers retain buffers that the pool cannot reuse.

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

Resource leak in Linux Kernel 6.13 through 6.18.16 and 6.19 through 6.19.6 allows local users to retain AF_XDP packet buffers. Fragment paths remove list_node with list_del(), leaving stale pointers that make xp_free() treat the buffer as already queued and skip returning it to the free list. Low-privileged local access to AF_XDP fragment handling is required; repeated triggers retain buffers that the pool cannot reuse.

The record

CVE
CVE-2026-23326
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=560c974b7ccd95bb9ff20df77f6654283e45c9c6 <5172adf9efb8298a52f4dcdc3f98d4d9d1e06a6d
  2. Affected versionversion=6.13
  3. Affected versionversion=b692bf9a7543af7ad11a59d182a3757578f0ba53 <60abb0ac11dccd6b98fd9182bc5f85b621688861
  4. Affected versionversion=b692bf9a7543af7ad11a59d182a3757578f0ba53 <645c6d8376ad4913cbffe0e0c2cca0c4febbe596
  5. Affected versionversion=b692bf9a7543af7ad11a59d182a3757578f0ba53 <b38cbd4af5034635cff109e08788c63f956f3a69
  6. Affected versionversion=fd5614763805d6f386bd07cc53558f88b1b1eb62 <2a9ea988465ece5b6896b1bdc144170a64e84c35

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=560c974b7ccd95bb9ff20df77f6654283e45c9c6 <5172adf9efb8298a52f4dcdc3f98d4d9d1e06a6d; version=6.13; version=b692bf9a7543af7ad11a59d182a3757578f0ba53 <60abb0ac11dccd6b98fd9182bc5f85b621688861; version=b692bf9a7543af7ad11a59d182a3757578f0ba53 <645c6d8376ad4913cbffe0e0c2cca0c4febbe596; version=b692bf9a7543af7ad11a59d182a3757578f0ba53 <b38cbd4af5034635cff109e08788c63f956f3a69; version=fd5614763805d6f386bd07cc53558f88b1b1eb62 <2a9ea988465ece5b6896b1bdc144170a64e84c35

Published CVSS scores

7.8NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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