UBUNTU-CVE-2026-90590

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Source
https://ubuntu.com/security/CVE-2026-90590
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90590.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-90590
Upstream
Published
2026-11-10T00:00:00Z
Modified
2026-11-11T09:41:40Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

The NXP ENET QoS Ethernet driver in drivers/ethernet/eth_nxp_enet_qos serialises transmission with a binary semaphore, data->tx.tx_sem, taken in eth_nxp_enet_qos_tx() and returned only by the transmit-completion interrupt handler tx_dma_done(). A frame that has been handed to the transmit DMA when the Ethernet link goes down is never written back, so that completion interrupt never arrives. The PHY callback eth_nxp_enet_qos_phy_cb() reacts to carrier loss only by calling net_eth_carrier_set(); it does not stop the DMA, take the descriptors back or release the outstanding frame, and no timeout exists to do so. The trigger is a link-down/link-up transition that lands while a frame is under the transmit DMA. It can be produced by anyone who controls the link partner or the cable — for example by administratively downing and restoring the attached switch port, or by restarting auto-negotiation from a peer device — and can be made reliable by generating traffic that keeps the device transmitting and repeating the transition. No credentials or user interaction are required, and the trigger is at the link layer rather than over IP. Because the semaphore is never given back, every subsequent call to eth_nxp_enet_qos_tx() fails with -EBUSY for the remaining life of the boot; restoring the link does not recover the interface, since the link-up path only rewrites MAC_CONFIGURATION. The affected interface continues to receive but can no longer transmit anything — no ARP replies, no TCP acknowledgements, no DHCP renewals — until the device is reset. The net_pkt and the net_buf fragments of the abandoned frame are likewise never unreferenced and never return to their pools. The security-relevant property is persistence: a momentary link flap leaves the interface permanently unable to send, so the denial of service outlasts the attacker's access to the link. There is no confidentiality or integrity impact. The fix adds a claim/release pair around the outstanding packet so that completion and abandonment are mutually exclusive, aborts an outstanding frame from the PHY callback on carrier loss (stopping the DMA, flushing the MTL transmit queue and reinitialising the descriptor ring), and arms a transmit watchdog, CONFIG_ETH_NXP_ENET_QOS_TX_TIMEOUT_MS, so that any non-completing DMA — not only a carrier loss — reclaims the transmit slot and the packet.

References

Affected packages

Ubuntu:16.04:LTS
zephyr

Package

Name
zephyr
Purl
pkg:deb/ubuntu/zephyr?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.1.2-1
3.1.2-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-1build1"
        },
        {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-1build1"
        },
        {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-1build1"
        },
        {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-1build1"
        },
        {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90590.json"
Ubuntu:18.04:LTS
zephyr

Package

Name
zephyr
Purl
pkg:deb/ubuntu/zephyr?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.1.2-1build1
3.1.2-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-1build2"
        },
        {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-1build2"
        },
        {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-1build2"
        },
        {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-1build2"
        },
        {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90590.json"
Ubuntu:20.04:LTS
zephyr

Package

Name
zephyr
Purl
pkg:deb/ubuntu/zephyr?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.1.2-1build3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-1build3"
        },
        {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-1build3"
        },
        {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-1build3"
        },
        {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-1build3"
        },
        {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-1build3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90590.json"
Ubuntu:22.04:LTS
zephyr

Package

Name
zephyr
Purl
pkg:deb/ubuntu/zephyr?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.1.2-1build3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-1build3"
        },
        {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-1build3"
        },
        {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-1build3"
        },
        {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-1build3"
        },
        {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-1build3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90590.json"
Ubuntu:24.04:LTS
zephyr

Package

Name
zephyr
Purl
pkg:deb/ubuntu/zephyr?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.1.2-1.1
3.1.2-1.1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-1.1build1"
        },
        {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-1.1build1"
        },
        {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-1.1build1"
        },
        {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-1.1build1"
        },
        {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-1.1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90590.json"
Ubuntu:26.04:LTS
zephyr

Package

Name
zephyr
Purl
pkg:deb/ubuntu/zephyr?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.1.2-1.1build1
3.1.2-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-4"
        },
        {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-4"
        },
        {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-4"
        },
        {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-4"
        },
        {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90590.json"
Ubuntu:26.10
zephyr

Package

Name
zephyr
Purl
pkg:deb/ubuntu/zephyr?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.1.2-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-4"
        },
        {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-4"
        },
        {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-4"
        },
        {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-4"
        },
        {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90590.json"