CVE-2025-21799

Kernel warning via negative IRQ mishandling

Published Feb 27, 2025 · Updated May 11, 2026

Improper IRQ validation in the Linux kernel's TI AM65 CPSW driver allows local users to trigger a kernel warning through channel changes. am65_cpsw_nuss_remove_tx_chns() treats a negative k3_udma_glue_tx_get_irq() error as valid because it checks for nonzero rather than a positive IRQ, then attempts to free that invalid value. The sequence requires privileged local channel reconfiguration, a transmit-channel initialization failure, and a later request for more channels; the reported result is a kernel warning.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper IRQ validation in the Linux kernel's TI AM65 CPSW driver allows local users to trigger a kernel warning through channel changes. am65_cpsw_nuss_remove_tx_chns() treats a negative k3_udma_glue_tx_get_irq() error as valid because it checks for nonzero rather than a positive IRQ, then attempts to free that invalid value. The sequence requires privileged local channel reconfiguration, a transmit-channel initialization failure, and a later request for more channels; the reported result is a kernel warning.

The record

CVE
CVE-2025-21799
Published
Feb 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 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=5.7
  2. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <321990fdf4f1bb64e818c7140688bf33d129e48d
  3. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <4395a44acb15850e492dd1de9ec4b6479d96bc80
  4. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <8448c87b3af68bebca21e3136913f7f77e363515
  5. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <88fd5db8c0073bd91d18391feb5741aeb0a2b475
  6. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <8aae91ae1c65782a169ec070e023d4d269e5d6e6
  7. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <aea5cca681d268f794fa2385f9ec26a5cce025cd
  8. Affected versionversion=93a76530316a3d8cc2d82c3deca48424fee92100 <ed8c0300f302338c36edb06bca99051e5be6fb2f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.7; version=93a76530316a3d8cc2d82c3deca48424fee92100 <321990fdf4f1bb64e818c7140688bf33d129e48d; version=93a76530316a3d8cc2d82c3deca48424fee92100 <4395a44acb15850e492dd1de9ec4b6479d96bc80; version=93a76530316a3d8cc2d82c3deca48424fee92100 <8448c87b3af68bebca21e3136913f7f77e363515; version=93a76530316a3d8cc2d82c3deca48424fee92100 <88fd5db8c0073bd91d18391feb5741aeb0a2b475; version=93a76530316a3d8cc2d82c3deca48424fee92100 <8aae91ae1c65782a169ec070e023d4d269e5d6e6; version=93a76530316a3d8cc2d82c3deca48424fee92100 <aea5cca681d268f794fa2385f9ec26a5cce025cd; version=93a76530316a3d8cc2d82c3deca48424fee92100 <ed8c0300f302338c36edb06bca99051e5be6fb2f

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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-476NULL Pointer Dereference

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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